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LASER APPLICATIONS
BY:-BHARATH K.L
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Outline
1. Introduction
2. Laser in Science & Industry
3. Laser in Telecommunication
4. Laser in Medical treatment5. Conclusion
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Laser beam is a powerful, narrow,
monochromatic and directional beam
of electromagnetic radiation.
Laser beams are within the visible
spectrum of light.
A laser device excites the atoms in a
lasing medium.
The electrons of these atoms move to a
higher orbit, then release photons,
creating a laser beam.
Introduction
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Laser in Science & Industry
Lasers are used in Science and industry
in a huge variety of applications. These
applications are uncountable.
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Laser in Science & Industry
Astronomy, Geography, and Surveying
Measuring Distances with Lasers
Drilling and Burning Holes with Light
Welding and Cutting with Lasers
Fighting Crime with Lasers
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CD Players
The detection of the binary data stored on the
compact disc.
It is done with the use of a semiconductor laser.
Diameter of about 0.8 mm at the bottom of the
disc.
1.7 micrometers passes through the clear
plastic to strike the reflective layer.
The reflected laser will be detected by a
photodiode.
CD
DVD
Blu-Ray
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Structure of CD
length = 5 km .
total number of pits more than 2 Billion .
width of each pit = 0.6 mm.
length of each pit = 0.83 to 3.05 mm.
depth of each pit = 0.11 mm.
distance between adjacent tracks = 1.6 mm.
density of tracks = 16,000 TPI
The wavelength of the Diode laser reading the CD =780 nm.
The spot size of the beam on the reflecting surface
of the CD = 1 mm.
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Bar code Reader
Bar code is used for identifying specific
items in many applications such as:
Inventory items in a storage, market, etc.
Identifying workers in registering time
present .
Quality control in assembly lines.
Reading a bar code optically is much faster
than using a keyboard and pressing a large
number of times for all the numbers of the
identification code.
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Laser in Medical Field
Lasers in the Medical Field
have found the most beneficialand useful applications in the
field of medicine
Laser has established
A Revolution in medicine Field
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Eye Treatment
Ruby laser was invented in 1960 and in
1961, it was used by eye doctors.
It is natural that the eye was chosen to
be the first organ for performing
medical experiments.
Since the eye is transparent to the
electromagnetic spectrum in the
visible range.
Another natural device that helps was
the lens in the eye, which focuses the
electromagnetic radiation onto the
retina.
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Eye Treatment
Excimer laser commonly used in
eye surgery and semiconductor
manufacturing.
Use this laser under computer
control to change in the shape of
the cornea.
Removing sub micron layers from
the cornea. Most of the problems with
focusing the image on the retina
can be repaired.
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Cosmetic Treatment
Laser technology is being used for huge
number of cosmetic treatments.
Skin Treatment
Hair Removal
Dentistry
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Skin Treatment
Most skin pigmentation is superficial and
can be treated with the use of lasers to
reduce its appearance. The methods that can be used to treat
skin pigmentation will be in direct relation
to its cause and severity.
generally shorter-wave-length systems
Q-switched 532nm Nd:YAG laser
recur frequently
Freckles
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Hair Removal
Ruby, alexandrite, diode, 1064nm YAG, IPL
Ruby (skin types fair to medium light)
Diode 810nm can treat darker skinned
patients (medium light to medium dark)
1064 nm YAG safest for skin types medium
dark to deep.
IPL appears equally as effective in skin types
medium dark to deep.
IPL can be used in all skin types.
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Laser Use in Dentistry
Tooth decay: Lasers are used to
remove decay within a tooth and
prepare the surrounding enamel
for receipt of the filling.
Lasers are also used to "cure" or
harden a filling.
Gum disease: Lasers are used toreshape gums and remove bacteria
during root canal procedures.
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Laser Use in Dentistry
Biopsy or lesion removal: Lasers can be
used to remove a small piece of tissue.
Laser are also used to remove lesions inthe mouth and relieve the pain of canker
sores.
Teeth whitening: Lasers are used to
speed up the in-office teeth whiteningprocedures.
A peroxide bleaching solution, applied to
the tooth surface, is "activated" by laser
energy, which speeds up of the
whitening process.
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Conclusion
In this period of time the technology has changed human lifedrastically. Some of the important inventions made by physicists
that have changed our life are LASER, Optical fibers, X-rays.
Lasers and optical fibers have dramatically increased the capacity ofthe international telephone system. The new communicationtechnology has fueled the exponential growth of the Internet.
The LASER is used in the product development ( CD player, barcode scanner), medical field, industry, defense, research, cosmeticskin treatments and dentistry.
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T H A N K Y O U
GUIDED
BY
BY
ROSE MARY