Workshop of Photonics Product Catalog

Laser equipment and applications Laser micro machining Medical lasers Laboratory services

Konstitucijos ave. 23C tel. +370 5 272 57 38 [email protected] LT-08105 Vilnius, Lithuania fax +370 5 272 37 04 www.wophotonics.com

Altechna R&D

Workshop of Photonics® (WOP) originated as a research and development department of Altechna Co. Ltd. Now as a separate company, WOP develops and produces microma-chining processes and instruments, laser electronics and micro lasers. Micromachining applications mainly include: sapphire patterning, optical fiber micro structuring, 3D direct laser writing in polymers and solar cell laser processing. State-of-art femtosecond laser technology is used in our laboratory activities and services. We also maintain a broad network of partner laboratories, which allows us to deal with almost any micromachining task providing more convenience for our customers.

WOP designs and produces miniature laser electronics as well as laser sources and turn-key laser systems tailored for medical and portable applications.

Our specialization in Analytical and Health-Care applications includes: SERS sensors for Raman spectroscopy Scaffolds for tissue engineering Microfluidic devices for sensing Electronics for laser based devices

For more information about Workshop of Photonics please visit www.wophotonics.com.

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13. M. Malinauskas, P. Danilevicius, D. Baltriukiene, M. Rutkauskas, A. Žukauskas, Ž. Kairyte, G. Bickauskaite, V. Purlys, D. Paipulas,V. Bukelskiene, R. Gadonas “3d Ar-tificial Polymeric Scaffolds For Stem Cell Growth Fabricated By Femtosecond Laser” Lithuanian Journal of Physics, Vol. 50, No. 1, pp. 75–82 (2010)




17. M. Malinauskas, P. Danilevicius1, A.Zukauskas1, G. Bickauskaite,V. Purlys, M. Rut-kauskas, T. Gertus, D. Paipulas1, J. Matukaite, A. Kraniauskas, R. Sirmenis, D. Bal-triukiene, V. Bukelskiene, R. Gadonas, V. Sirvydis, A. Piskarskas “Laser 3D Micro/Nanofabrication of Polymers for Tissue Engineering Applications” Latvian Journal Of Physics And Technical Sciences 2011, Nr. 2




21. M. Malinauskas,P. Danilevicius, A. Zukauskas, D. Paipulas, V. Purlys, R. Gadonas, A. Piskarskas D. Baltriukiene, R. Jarasiene, V. Bukelskiene, A. Kraniauskas, R.Sirmenis, V. Sirvydis. “Biocompatibility of polymers and laser-fabricated three-dimensional micro-structured polymeric scaffolds for biomedical applications” Submitted for “Engineering in Life Sciences” journal October 11, 2010

1. Products . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4

1.1. Laser Machines . . . . . . . . . . . . . . . . . . . . . . . . . . 4

1.2. Laser Sources . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

1.3. Electronics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

1.4. Laser Software . . . . . . . . . . . . . . . . . . . . . . . . . . 17

1.5. Optomechanics . . . . . . . . . . . . . . . . . . . . . . . . . . 20

1.6. Special Optics . . . . . . . . . . . . . . . . . . . . . . . . . . . 23

2. Services . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24

2.1. Micromachining Services . . . . . . . . . . . . . . . . . 24

2.2. Development Services . . . . . . . . . . . . . . . . . . . 27

3. Technologies . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29

3.1. Two-photon Polymerization . . . . . . . . . . . . . . . 29

3.2. 2PP Applications . . . . . . . . . . . . . . . . . . . . . . . . 32

3.3. Femtosecond Laser Micro Machining . . . . . . 35

3.4. Micromachining Applications . . . . . . . . . . . . . 36

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1. Products1.1. Laser Machines

LASER MACHINES - INTRODUCTION

Custom developed systems for various laboratory and industrial laser micromachin-ing tasks. Application of laser machines developed by WOP varies from solar cell production to ceramics scribing and 3D polymerization.

Key applications: Solar Cell processing Sapphire dicing and patterning Optical Fiber processing Stent Cutting Ceramic plate scribing

Other applications are tested on request.

More information at http://www.wophotonics.com/products/

Systems are built in partnership with Elas www.e-lasers.com

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FemtoFAB

FemtoLAB

FemtoFAB is a turnkey femtosecond laser machine for industrial use. Configuration is selected and care-fully tuned according to a specific laser micromachin-ing application, including laser cutting, laser scribing, laser drilling and 3D laser milling with any desirable material (with >2,4 GW peak power). System is pro-tected by Class 1 equivalent laser safety enclosure and is controlled through a single SCA engineer software window.

Features High fabrication speed – up to 300 mm/s Fabrication of difficult objects with submicron resolution Minimal heat affected zone in femtosecond micromachining mode Aerotech based precise object positioning with submicron accuracy Precise laser beam control in space using high-performance galvanometer scan-

ners Pulse number control (single to 1 MHz) Synchronization of laser pulses with moving object in space and time domains Original software interface for control of all integrated hardware devices


For purchase contact [email protected]

Femtosecond laser micromachining system for scientific laboratories. Equipped with nanometer accuracy and resolution linear positioning stages, high performance galvanometer scanners and versatile micromachining software SCA, Fem-toLAB becomes an entire laser laboratory on an optical table.

Tunable parameters: pulse duration (<200 fs – 10 ps); repetition rate (1 – 1000 kHz); average power (up to 15W); wavelengths (1030, 515, 343, 258 nm).

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National innovation prize 2010SOLLAS

WOP-PV-F

An industrial-research laser ma-chine for c-Si solar cells. Equipped with cutting edge duet – femto-second UV laser and nanosecond IR laser, Sollas is a multi-tasking system, designed for industrial-research or up to 3 MW/a capacity pilot manufacturing lines.

Features: Optimized for 2.5 MW/a throughput industrial-research line Femtosecond UV and nanosecond IR laser sources Machine vision system detecting rotation and adjusting laser scanning field Precise laser beam control in space using high-performance galvanometer scanners 5″ and 6″ wafer processing Intuitive touch-screen user interface for simple production mode operation

(SCA engineer) Full functionality software access in research mode (SCA engineer)

Sollas performs 4 technological processes: Selective SiNx/SiO2 removal Back contact laser firing Edge isolation Laser marking Other processes are integrated after feasibility tests

An optical unit dedicated for fiber laser processing of c-Si solar cells. Small footprint allows easy installa-tion in new or existing PV manufacturing facilities. Integrated high-performance galvanometer scanners are able to process both – 5″ and 6″ wafers. Custom-ized release of SCA engineer performs wafer edge detection, controls XYZ beam positioning, laser pa-rameters, and provides micro monitor function in a single software window.

Advantages: Reliable operation Non-contact processing Small footprint and compact size Convenient automation software Simple integration in in-line manufacturing facilities Fast machine vision

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nSCULPTOR

WOP-XS


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nesnSCULPTOR is a turnkey 3D laser lithography sys-

tem for fabrication of nano structures. Operation of the system is based on multi photon polymerization (mPP) technique and works with many conventional photoresists available in the market. nSCULPTOR enables prototyping and production of various three-dimensional structures at nanometer accuracy and resolution.

All processes of fabrication are integrated into a single system

3D model creation and preparation Direct laser writing Post-processing

Advantages: All-in-one solution 100 nm – 10 μm resolution Complex 3D objects Variety of polymers Small footprint

A cost effective optical unit dedicated for wafer processing in laboratory environment. Very small footprint allows easy installation in existing laboratory facilities, by attaching it to an optical table. Integrated high-performance galvanometer scanners are able to process both – 5″ and 6″ wafers. Cus-tomized release of SCA student controls XY or XYZ beam scanning and laser parameters.

Advantages: Reliable operation with any selected laser source Non-contact processing Very small footprint and compact size Convenient automation software Cost effective solution Convenient sample tilting Vacuum chuck and dust removal options Machine vision option

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1. Products1.2. Laser Sources

LASER SOURCES - INTRODUCTION

We design and manufacture Micro DPSS and OPSL lasers as well as turnkey laser diode systems for analytical and medical applications.

Key applications: Blood vessel treatment Vein removal Dental Laser treatment Pump source for harmonic generators, and amplifiers Laser induced Fluorescence Laser Induced Breakdown Spectroscopy (LIBS) Test and measurement systems Environmental sensing, bio detection

Custom development of lasers based on DPSS or OPS technologies is available on request.


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DPSS Micro Laser AltLAS


Yb:YAG micro laser combines high rep-etition rate and powerful pulses with good beam quality and high output power. Due to unique characteristics of Yb:YAG laser crystal we can propose very wide range of different parameters on request.

Features: Excellent beam quality High repetition rate High pulse energy High output powerSmall footprint High level of frequency control – from single pulse to 10kHz*

Model AltLAS – C5 AltLAS – C10 AltLAS – G5 AltLAS – CW

Wavelength, nm 1030 1030 515 1030

Output power, mW 200 250 50 1000

Pulse energy, μJ 40 25 10 -

Pulse duration, ns <1.3 <1.5 <1.3 -

Repetition rate, kHz 0.001- 5* 0.001 – 10* 0.001 – 5* -

Beam Quality M2 <1.2 <1.2 <1.4 <1.2

Polarization ratio >30:1 >30:1 >50:1 >30:1

P2P energy stability, %

+/-5 +/-5 +/-5 -

Maximal timing jitter, μs

<2 <2 <2 -

Output power stability

Rms 1.25 %, PTP 2.6 %

Rms 1.25 %, PTP 2.6 %

Rms 1.25 %, PTP 2.6 %

Rms 0.75 %, PTP 1.6 %

Operating temperature, °C

15 – 30 15 – 30 15 – 30 15 – 30

Warranty One year One year One year One year

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1. Products1.3. Electronics

ELECTRONICS - INTRODUCTION

We provide laser control electronics for medical laser systems and low to mid range average power laser sources. Multifunctional and compact devices are easily inte-grated and conveniently controlled through USB, LCD and touch-screen interfaces.

Low cost stepper motor controller is also available in this category.

Custom development of electronics for laser control or optomechanics control is available on request.


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Only LDD


All-in-one solution for direct laser diode applications.Incorporates laser diode driv-er, aiming beam driver, temperature con-troller (fan/water pump control) as well as LCD and USB control interfaces. Micro-controller based cost effective CW/QCW laser diode driver for single-emitter laser diodes. Short current pulse rise/fall time durations in QCW mode.

Specifications

Parameter ValueMax. laser diode current (CW) 12 AMax. laser diode current (QCW) 15 ACurrent setpoint resolution 0.01 AMax. output voltage 6 VAiming beam current 250 mAAiming beam voltage 6 VFAN (water pump) output voltage same as +VCCTemperature stability 0.5 CTemperature setpoint resolution 0.1 CRepetition rate in QCW operation 20 Hz - 500 kHzPulse width 1 μs – 5 msPulse switch durations (10Amps pulses) >1000 nsInput DC voltage (+VCC) +7.5 VTotal output power up to 90 WDimensions (controller, LxWxH) 136x118x44 mmDimensions (power supply) 168 x 70 x 40 mm

Only LDD laser diode driver is perfectly suited for direct laser diode applica-tions:

medical laser stations material processing high energy but low average power DPSS lasers

The most straightforward application is medical laser for dental treatment – that’s what for the laser diode driver was designed as all-in-one solution.

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Only OEM


The OEM version of the Only LDD laser diode driver. Due to better heat management capabilities, higher power is available in the OEM ver-sion.

Features: QCW and CW operation

modes Plug-and-play configuration Integrated quartz based pulse

generator Fan/water pump controller Standard mini USB 2.0 interface for remote control Low current aiming beam driver Interlock channel on D-SUB37 for connection of key e. stop or power on switch Gate function for pulse trains generation or control of laser diode from external

pulse generator Two NTC inputs; the second input can be programmed to support external con-

trol pedal (for medical applications) Two lines text LCD screen 2 year full service warranty

Specifications

Parameter ValueMax. laser diode current (CW) up to 15 AMax. laser diode current (QCW) up to 30 ACurrent setpoint resolution 0.01 AMax. output voltage 6 V*Aiming beam current 250 mAAiming beam voltage 6 VFAN (water pump) output voltage same as +VCCTemperature stability 0.01 CTemperature setpoint resolution 0.1 CRepetition rate in QCW operation 20 Hz - 500 kHzPulse width 1 μs – 5 msPulse switch durations (10Amps pulses) >1000 nsInput DC voltage (+VCC) +7.5 V*Total output power up to 144 WSize (LxWxH) with aluminum pad 125x110x30 mm

* higher voltages available on request.

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Tiny LDD


Cost-effective solution designed for safe and reliable operation of single-emitter la-ser diodes and low power DPSS lasers. It incorporates laser diode driver and 2 TEC controllers as well as on-board user interface with 2-row LCD display and control buttons.

Features Easy controlled Soft start function User selectable: 2 uni-directional TEC controllers or single bi-directional TEC

controller 2 single-directional TEC controllers Smooth temperature stabilization. Adjustable parameters to avoid temperature

oscillations Overheating protection for laser diode Can be used in multistage laser systems. Master LDD can start/stop slave LDD’s

(from 1.4 ver.) Compact size LD current modulation (optional) Microprocessor controlled USB 2.0 compatible

Specifications

Parameter ValueLaser diode current source current range 0.4 to 10 ALaser diode current increment/decrement step 0.004 ALaser diode voltage limit range 1.5 to 3 VLaser diode voltage limit increment/decrement step 0.001 VNTC (termoresistor) value @25degC 10 kOhmTEC driver current (each channel) up to 4 AExternal power supply voltage 100-240 V AC to +5 V DCDimensions (controller without pads) 130 x 55 x 30 mmDimensions (power supply) 119 x 60 x 37 mmExternal TTL trigger signal 0-5 V

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Tiny OEM


The OEM version of the Tiny LDD laser diode driver. Small size and feature dense unit easily fits compact laser enclosures.

Features Easy controlled Soft start function User selectable: 2 uni-directional TEC controllers or single bi-directional TEC

controller 2 single-directional TEC controllers Smooth temperature stabilization. Adjustable parameters to avoid temperature

oscillations Overheating protection for laser diode Can be used in multistage laser systems. Master LDD can start/stop slave LDD’s

(from 1.4 ver.) Compact size LD current modulation (optional) Microprocessor controlled USB 2.0 compatible

Specifications

Parameter ValueLaser diode current source current range 0.4 to 10 ALaser diode current increment/decrement step 0.004 ALaser diode voltage limit range 1.5 to 3 VLaser diode voltage limit increment/decrement step 0.001 VNTC (thermoresistor) value @25degC 10 kOhmTEC driver current (each channel) up to 4 AExternal power supply voltage 100-240 V AC to +5 V DCDimensions 130 x 55 x 30 mmExternal TTL trigger signal 0-5 V

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Step Motor Controller


Features: Microprocessor control USB control interface TTL STEP/DIR control interface User friendly PC control software Compact size Unbeatable price

Specifications:

Virtual serial port (“COM port”) settings then attached to USB: Baud rate 38400 8 data bits 1 stop bit Parity: none Flow control: none

Controller input (“STEP/DIR INTERFACE” connector):

Input pins DescriptionUartRxUartTx

UART baud rate 38400, 8 data bits, 1 stop bit, no parity. RXD and TXD pins are 5V compatible with reference to GND pin. Maximal input voltage +5.5 V

Step/Dir/En These pins are optically isolated, 3.3 V – 5 V compatible.Input current requirement per pin:4.6 mA @ 2.8V5.2 mA @ 3.3V6.8 mA @ 5 V

ModeSelUartOn

These logic pins are not optically isolated. 5V compatible with reference to GND. Maximal input voltage +5.5 V

Motor output:

Characteristic RatingMax output voltage 12 VMax output current 2 ACurrent regulation type Pulse Width ModulationMicrostepping capability Full, Half, Quarter, Eighth, Sixteenth stepsStep frequency Up to 4 kHz

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1. Products1.4. Laser Software

LASER SOFTWARE - INTRODUCTION

Workshop of Photonics® develops SCA software packages for laser micromachining. SCA is a universal and flexible tool for controlling and automation of laser, transla-tion stages, galvanometer scanners, piezo positioners and other devices used in laser micromachining systems.

With its abundance of useful features, SCA makes micromachining tasks easily de-scribable, controllable and repeatable.

SCA professor™ is the most flexible, fully functional edition, dedicated to technically and ideologically unlimited 3D mi-cromachining experiments.

SCA student™ is a cost effective software solution for rela-tively simple micromachining tasks. It controls either three-axis motion system or two axis galvanometer scanners.

SCA engineer™ is dedicated to industry and industrial re-search laser micromachining systems. Implying task optimized machine vision algorithms, production operation mode, control of production line peripherals, etc. SCA Engineer is suitable for automated control of high-end laser micromachining instru-ments.


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Main features of SCA professor: Directly controls Aerotech positioning equipment (no need of G-code) Controls up to 5 axis positioning system, including linear, galvanometer or rotary Incorporates convenient algorithms and mathematical commands Synchronizes laser operation with positioning stages and galvo-scanners Integrated micro monitoring function 3D fabrication trajectory preview window Integrated process control Position synchronized output (PSO) operation Direct laser parameter control Motorized attenuator control Virtual joystick

Supported file formats:

*.dxf – for 3D and 2D object fabrication,

*.plt (.hpgl, .hpg) – stand-ard plotter format for fab-rication of 2D objects; fea-tures fabrication trajectory optimization, hatching func-tion with varying line den-sity and angle,

*.stl – file format standard used in 3D lithography; fea-tures horizontal and angled slicing, shell formation ac-cording to surface of an ob-ject, shells (or layers) can vary in numbers, distance between shells. User can define number of inside and outside shells to be modeled and distance between shells. This allows increasing wall thickness of a fabricated 3D object.

*.bmp – common raster graphics file format, featur-ing gray scale fabrication based on pulse density, relief fabrication based on bitmap intensity levels, polarization change based on bitmap in-tensity levels.

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.stl file is formed of triangles.

.stl file sliced by SCA professor

Sliced object, having 3 shells to thicken the wall


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Recommended system requirements: WinXP/Win 7 operating system Equivalent to ATI Radeon HD 2000 series, NVIDIA GeForce 210 (or better) Double core 2 GHz CPU (or better) 2 GB of RAM (or better)

Applications: 3D direct laser writing laser cutting laser etching laser marking laser dicing



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1. Products1.5. Optomechanics


WATT PILOT

The third edition of motorized variable attenuators developed by WOP. Controlled through USB as stand-alone or fully integrable with SCA laser automation software, Watt Pilot continuously variable motorized attenuator is readily used in automated laser systems.

Features User friendly and flexible control software Easy to integrate USB/Step-dir control interfaces 44 steps/degree resolution Rugged and compact aluminum body

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Specification

Model Clear aper-ture

Operational wavelength range

Configuration Optimization Attenuation range@CWL

Damage threshold, @10ns, 1064nm, 10Hz

Typicalapplication

Standard15mm(up to 50mm are available)

+/-2nmλ/2 LowOrder Wave-plate + cemented Polarizing cube

Transmission/Reflection mode

0,5-95% for transmitted p-pol beam

>0,3J/cm2

CW medium power lasers and LDs

+/-10nm

λ/2 ZeroOrder Wave-plate + cemented Polarizing cube

>0,3J/cm2

λ/2 ZeroOrder Wave-plate + optically contacted Polarizing cube

>5J/cm2

Enhanced15mm(up to 50mm are available)

+/-5nm

λ/2 ZeroOrder Waveplate + 2x Brewster type thin film polarizers

Reflection mode0,3-99% for reflected s-pol beam

>5J/cm2;

>100mJ/cm2@100fs, 800nm

High power CW and pulsed lasers, LDs

+/-20nm

λ/2 ZeroOrder Waveplate + 2x Broadband Brewster type thin film polar-izers

Reflection mode0,5-98% for reflected s-pol beam

+/-5nm

λ/2 ZeroOrder Waveplate + 1x Brewster type thin film polarizer

Transmission mode


UltraFAST15mm(up to 50mm are available)

+/-25nm

λ/2 ZeroOrder Wave-plate + 2x Broad-band (ultraFAST) thin film polarizers

Transmission mode

1-85% for transmitted p-pol beam

>5J/cm2;

>100mJ/cm2@100fs, 800nm

Ultrashort powerful lasers; broad-band laser sources

Transmission Contrast mode


Reflection mode4-96% for reflected s-pol beam

Reflection Contrast mode

0,1-70% for reflected s-pol beam

+/-50nm

λ/2 Achromatic Waveplate + 2x Broadband (ul-traFAST) thin film polarizers

Transmission mode

1-85% for transmitted p-pol beam

Transmission Contrast mode


Reflection mode4-96% for reflected s-pol beam

Reflection Contrast mode

0,1-70% for reflected s-pol beam

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Universal Sample Holder

Designed in WOP laboratories for holding wide variety of samples during microma-chining. It proved to be very versatile and convenient in operation.

Features 5 vacuum chucking places robust steel or stainless steel construction place for bottom lighting place for fiber fastening tilt adjustment

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1. Products1.6. Special Optics

Radial Polarization Converter (Z-polarizer)

Radial (azimuthal) or Z polarization enables focusing of a laser beam to a smaller spot size and achieving the same machining properties in all di-rections. This special configuration lambda plate can either convert Line-ar polarization to radial or azimuthal; or it can create an optical vortex of higher level (up to 4th and 5th) topological charge.

Features Converts Linear polarization to radial or azimuthal Creates optical vortex High damage threshold Nearly 100% conversion efficiency 50-60% transmission efficiency Large aperture possible (up to 10 mm or bigger; standard is 4 mm) Anti-reflection coatings applicable

Benefits for laser micromachining Helps achieving smaller spot size Ensures the same machining properties in all directions*

*When processing materials with linearly polarized light, features are bigger in width, when machining is performed in the direction perpendicular to displacement of the beam and vice versa.

Product Operation wavelength, nm

Transmission Clear Aperture, mm

RPC-515-02 515 ±50 >50% 2RPC-515-04 515 ±50 >50% 4RPC-515-06 515 ±50 >50% 6RPC-1030-02 1030 ±50 >75% 2RPC-1030-04 1030 ±50 >75% 4RPC-1030-06 1030 ±50 >75% 6RPC-1550-02 1550 ±50 >85% 2RPC-1550-04 1550 ±50 >85% 4RPC-1550-06 1550 ±50 >85% 6

Standard models. Custom configurations available on request.

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2. Services2.1. Micromachining Services

MICROMACHINING SERVICES - INTRODUCTION

We employ in-house and external laboratory resources and can provide virtually any micromachining service. Our experience in multiple applications guarantees best lead times and results.

More information at http://www.wophotonics.com/services/

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Micromachining Process Development

Need to fabricate micron scale structures on the surface or in the bulk? Already tried and disap-pointed with other technologies? Our laboratories equipped with ultra-short pulse lasers (from be-low 300 femtoseconds) is a place where machin-ing perfection can be achieved.

Our researchers will test your materials to achieve desired fabrication mode and consult on imple-mentation of it in mass production. Our working experience covers great variety of materials and our original micromachining soft-ware SCA allows achieving the desired results fast.

Laser testing procedure

After receipt of enquiry, we analyze and provide initial statement free-of-charge. After filling in the application request form, a fee-based testing schedule is planned.

Initial laser micromachining test is performed by WOP researchers. After that they provide basic information on machining speed achieved and expectable or non-ex-pectable feasibility of the process as well as the further development plan.

Most of laser micromachining applications are not as straightforward as for example marking. Some processes need develop-ment which takes weeks and even months. Not only different laser parameters have to be tested but also various beam shaping and focussing solutions.

A typical approach for comprehensive process development contains following steps:

testing of different wavelengths in order to explore light-material interaction testing of different focussing optics selecting and testing most suitable positioning solution determining, what’s required for repeatability optimising software functionality for convenient process control

You are welcome to contact us with specific micromachining tasks. We are committed to develop a micromachining process for you, transfer or license associated know-how and intermediate in development/selection and production of a dedicated laser machine.


Feasibility Studies On Laser Micromachining

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Laser Laboratory Rent

Since micromachining workstations incorpo-rating ultra-short pulse lasers are rather ex-pensive, it is not always worth buying one. Especially if you need to machine a small batch of articles, consider using our job shop services.

Accompanied by researchers from WOP or totally confidentially, researchers from aca-demic institutions or industrial laboratories might rent one of our laboratories. With rates starting from 600 EUR/day renting is a good substitute for owning the pricy equipment and clean-room premises.


Small Scale Production (Job-Shop)


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Our engineers of all major fields (electronics, mechanics, optics, software, microma-chining process) are ready to take development orders for designing laser systems, medical lasers and electronics as well as developing micromachining processes for industrial applications.


2. Services2.2. Development Services

DEVELOPMENT SERVICES - INTRODUCTION

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Development of DPSS micro lasers. Re-quired beam parameters are achievable within low- to mid-range average power and nano- to pico-second durations.

Decided to build a laser workstation by your own? Or just want to integrate acquired components (lasers, po-sitioning stages, scanners) into a single device? Please contact us for consultations. WOP also does sub-contract laser and workstations development. Our engineers will prepare drawings for CNC machining, wiring, also will prepare instructions for assembling, tuning and testing.

Design and development of microprocessor based laser electronics is one of the core competences at WOP. Apart from currently manufactured laser diode drivers and TEC controllers, we provide services related to customization of existing products or de-velopment of completely new laser electronics solutions for industrial and medical diode laser and DPSS laser applications.

At laser electronics we impose: expertise on design of microcontroller based systems wide selection of user interfaces good component sourcing good technical base for testing of electronics production management skills

Laser Development

Laser Workstation Design

Laser Electronics Development


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3. Technologies3.1. Two-photon Polymerization

How does 2PP work?

Two-photon Polymerization is a unique technology for 3D structuring of micron scale objects with nanometer precision. Femtosecond laser beam is focused inside a drop of sol-gel or other types of photoresist polymer and desired pattern is “written” precisely point–by-point (Fig. 1 a and b). Then, the unsolidified remainder of the pho-toresist is washed away leaving only the fabricated microstructures on the substrate (Fig.1 c).

Features: 100 nm – 10 µm writing resolution Medium cost per sample Variety of polymers Complex 3D objects

What is a “technological platform”?

2PP technological platform can offer a flexible solution for micro prototyping and production. It is a combination of feasibility studies, small-scale production and de-velopment of turn-key work stations. This platform includes certain steps from select-ing the most suitable photoresist to building task-dedicated laser system for science or industry.

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Laser system software “SCA”

The SCA laser automation software product family is distinguished among other existing laser software solutions by the key working principle – it controls positioning stages by directly addressing the command libraries of the positioning stages software (no machine code conversion). Structures of any geometry can be fabricated directly from CAD file. There are no limitations for object shape or direct writing geometry, except those limited by obvious laws of physics.

Photoresist Polymer Materials Variety of photoresist materials with required features can be chosen; No structural distortions; Certain wavelength absorption; Refractive index matching.

Precision and Controllable Self-Polymerization

Standard direct writing is able to make repeatable structures as small as 100nm, though by employing self-polymerization effect, the smallest lines can be around 20 nm. This effect occurs when certain distance between polymerized structure walls is kept, so self-polymerizing structures can be controlled, at least to some extent.

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Repeatability

Reliable and multifunctional software ‘SCA Professor’ensures fast preparation, stable workflow. 3D lithography is related to huge amounts of data, which has to be trans-mitted between computer and positioning controllers. Many systems crash because of poor software adaptation to these specific tasks. ‘SCA professor’ splits the data in portions to deliver them safely and timely to the controllers. Moreover, identical structures can be fabricated by direct laser writing process but in order to save time and work for large area patterning stamping technique can be used.

Periodic structures

Main Applications: Microoptics Photonic crystals Regenerative medicine

More information at http://www.wophotonics.com/applications/

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3. Technologies3.2. 2PP Applications

Application in Micro Optics

Many polymers are transparent to visible light and can be combined with other ma-terials like Zn or Ge. The ability to control light flow can be used in micro optical devices, such as micro lenses, hybrid micro lenses with a phase gratings, micro lens arrays, vortex beam screw generators, vortex generator arrays or other. The 2PP tech-nology allows fixing of such micro optical devices on limited surfaces like the tip of an optical fiber.

Application in Photonics

Highly repeatable and stable technological process aims at fabrication of detractive gratings and photonic crystals.

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Application in Regenerative Medicine

Regenerative medicine is the most promising application field for 2PP technology, because polymerization can offer variety of custom elements which need controlla-ble precision, biocompatibility or biodegradability. Polymeric scaffolds for stem cells growth can be fabricated in any 3D shape for application in tissue engineering.

Scaffolds for tissue engineering.The last picture shows that artificial scaffold ambient is suitable for cell proliferation, because there is a cell growing in mito-sis stage.

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Biocompatibility and biodegradability have been tested in vivo and in vitro. His-tological tests show that sol-gel material is more biocompatible that a surgical suture or surgical clip.

If you are interested in Two-Photon Polymerization technological platform do not hesitate to contact us, we would gladly answer to your questions and give you the best solution according to your specific requirements.

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3. Technologies3.3. Femtosecond Laser Micro Machining

Femtosecond laser micro fabrication is currently the most precise technological plat-form among other laser technologies, which is used for material processing. First of all, femtosecond laser pulses distinguish itself as causing minimal heat effect, there-fore almost any solid state material can be fabricated with submicron resolution.

Workshop of Photonics is developing microfabrication technological platform, in order to provide scientific and industrial customers with:

Feasibility studies Fabrication process development Small scale production Micromachining system development or mass production. Laboratory rent and demo

Our competences, accumulated know-how and well equipped laboratories are capable to perform these processes:

Precise drilling, cutting, dicing and making Ablation, etching, 2.5 D milling 3D in bulk engraving Surface micro-nano structuring Laser-Induced Backside Wet Etching (LIBWE) Refractive index modification in transparent materials Optical micro-manipulation Two-photon polymerization


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3. Technologies3.4. Micromachining Applications

SiNx ablation from crystalline solar cells Ablation of approx. 90 nm layer Perfect selectivity with 343 nm pulses No melting and HAZ

Applications: Front contact formation Back contact formation

Ablated fingers and buss bars on a solar cell Controlled pulse density Optimal pulse overlapping No melting and HAZ


Fingers deposited by nickel Selective deposition on ablated areas Electro-less plating method is applicable Good conductivity


Optical fiber drilling Good inner wall flatness Various hole profiles possible All types of fibers can be processed

Applications: Optical fiber sensors Material science

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Optical fiber drilled to the middle Diameter from <10 μm Various hole profiles possible Depth and angle control

Applications: Optical fiber sensors Material science

Optical fiber lensed using 2PP technique Matching refractive index Shape flexibility Resolution from 100 nm to 20 μm

Applications: Medical fibers Fiber collimators

Optical fiber scattering No impact on fiber strength No surface damage Even light dispersion

Applications: Medical fibers Oncology

Diamond cutting Low carbonization No HAZ Low material loss

Applications: Diamond sheet cutting Diamond texturing/patterning

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Steel foil μ-drilling No melting Micron diameter

Applications: Filters Functional surfaces

Chrome ablation from glass substrate Selective ablation Resolution from 1 μm

Applications: Lithography mask production Beam shaping elements

Chrome ablation for beam shaping Selective ablation Submicron resolution

Applications: Vortex beam generation

Sapphire bulk marking Colorful structures due to small pixel size Very small cracks Low influence on strength of the substrate

Applications: Anti counterfeiting Colorful logos on watches and other luxury

products

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Glass marking No crack formation Intra-volume and surface marking

Applications: Solar panels Medical equipment marking Many other

Ferroelectric ceramics etching No or low melting Easily removable debris Good structuring quality

Applications: Infrared sensors for cameras Memory chips

Sapphire patterning Micron resolution Large area processing

Applications: LED production Semiconductor structure growth

Silicon laser assisted etching No HAZ No melting

Applications: Solar cell production Semiconductor industry

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Steel marking/patterning Small spots form colorful diffractive picture No heat effect

Applications: Product marking Surface hardening Functional surfaces

Hair marking

Capabilities demonstration

Glass tube drilling Controlled damage and depth

Applications: tissue biopsy equipment

Amplitudegrating formation Example: with bifunction m=25 for light

Applications: vortex generation

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Hologram production Example: hologram view generated using glass

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Aperture array fabrication selective removal of chrome layer from glass

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Applications: optical apertures

Micro channel formation wide range of materials – from glass to polymers

Applications: microfluidic sensors waveguides

“Workshop of photonics” logo fabricated inside an optical fiber

Capabilities demonstration

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* Illustrations source

1. Mangirdas Malinauskas, Arune Gaidukeviciute, Vytautas Purlys, Albertas Zukauskas “Direct laser writing of microoptical structures using a Ge-containing hybrid material” Metamaterials 5 (2011) 135–140

2. MangirdasMalinauskas, Holger Gilbergs, Albertas Zukauskas, Vytautas Purlys, Domas Paipulas, Roaldas Gadonas, “A femtosecond laser-induced two-photonphotopolymeri-zation technique for structuring microlenses” J. Opt. 12 (2010) 035204 (8pp)

3. Mangirdas Malinauskas, Arune Gaidukeviciute, Vytautas Purlys, Albertas Zukauskas “Direct laser writing of microoptical structures using a Ge-containing hybrid material” Metamaterials 5 (2011) 135–140

4. M. Malinauskas, V. Purlys, M. Rutkauskas, A. Gaidukeviciute, R. Gadonas “Femtosec-ond Visible Light Induced Two-Photon Photopolymerization For 3d Micro/Nanostruc-turing In Photoresists And Photopolymers” Lithuanian Journal of Physics, Vol. 50, No. 2, pp. 201–207 (2010)

5. M. Malinauskas, V. Purlys, M. Rutkauskas, A. Gaidukeviciute, R. Gadonas “Femtosec-ond Visible Light Induced Two-Photon Photopolymerization For 3d Micro/Nanostruc-turing In Photoresists And Photopolymers” Lithuanian Journal of Physics, Vol. 50, No. 2, pp. 201–207 (2010)

6. Mangirdas Malinauskas, Albertas Zukauskas, Vytautas Purlys, Kastytis Belazaras, An-drej Momot, Domas Paipulas, Roaldas Gadonas, Algis Piskarskas, “Femtosecond laser polymerization of hybrid/integrated micro-optical elements and their characterization” J. 2010 J. Opt. 12 124010

7. Mangirdas Malinauskas, Albertas Zukauskas, Vytautas Purlys, Kastytis Belazaras, An-drej Momot, Domas Paipulas, Roaldas Gadonas, Algis Piskarskas, “Femtosecond laser polymerization of hybrid/integrated micro-optical elements and their characterization” J. 2010 J. Opt. 12 124010

8. Etienne Brasselet, Mangirdas Malinauskas, Albertas Zukauskas,Saulius Juodkazis Pho-to-polymerized microscopic vortex beam generators : precise delivery of optical orbital angular momentum Appl. Phys. Lett. 97, 211108 (2010); doi:10.1063/1.3517519



11. Mangirdas Malinauskas, Holger Gilbergs, Vytautas Purlys, Albertas Žukauskas, Marius Rutkauskas and Roaldas Gadonas, “Femtosecond laser-induced two-photon photopo-lymerization for structuring of micro-optical and photonic devices” Proc. of SPIE Vol. 7366 736622-1 (2009)

12. Mangirdas Malinauskas, Holger Gilbergs, Vytautas Purlys, Albertas Žukauskas, Marius Rutkauskas and Roaldas Gadonas, “Femtosecond laser-induced two-photon photopo-lymerization for structuring of micro-optical and photonic devices” Proc. of SPIE Vol. 7366 736622-1 (2009)

Workshop of Photonics® (WOP) originated as a research and development department of Altechna Co. Ltd. Now as a separate company, WOP develops and produces microma-chining processes and instruments, laser electronics and micro lasers. Micromachining applications mainly include: sapphire patterning, optical fiber micro structuring, 3D direct laser writing in polymers and solar cell laser processing. State-of-art femtosecond laser technology is used in our laboratory activities and services. We also maintain a broad network of partner laboratories, which allows us to deal with almost any micromachining task providing more convenience for our customers.

WOP designs and produces miniature laser electronics as well as laser sources and turn-key laser systems tailored for medical and portable applications.

Our specialization in Analytical and Health-Care applications includes: SERS sensors for Raman spectroscopy Scaffolds for tissue engineering Microfluidic devices for sensing Electronics for laser based devices

For more information about Workshop of Photonics please visit www.wophotonics.com.

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21. M. Malinauskas,P. Danilevicius, A. Zukauskas, D. Paipulas, V. Purlys, R. Gadonas, A. Piskarskas D. Baltriukiene, R. Jarasiene, V. Bukelskiene, A. Kraniauskas, R.Sirmenis, V. Sirvydis. “Biocompatibility of polymers and laser-fabricated three-dimensional micro-structured polymeric scaffolds for biomedical applications” Submitted for “Engineering in Life Sciences” journal October 11, 2010

Laser equipment and applications Laser micro machining Medical lasers Laboratory services

Konstitucijos ave. 23C tel. +370 5 272 57 38 [email protected] LT-08105 Vilnius, Lithuania fax +370 5 272 37 04 www.wophotonics.com

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