High Average Power, High Energy, Femto-second Fiber Chirped Pulse Amplification System. F. He, J. H. V. Price, A. Malinowski, A. Piper, M. Ibsen, D. J. Richardson Optoelectronics Research Centre University of Southampton, Southampton, UK - PowerPoint PPT Presentation
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SOUTHAMPTON SOUTHAMPTON High Average Power, High Energy, Femto- High Average Power, High Energy, Femto- second Fiber Chirped Pulse second Fiber Chirped Pulse Amplification System Amplification System F. He, J. H. V. Price, A. Malinowski, A. Piper, M. Ibsen, D. J. Richardson Optoelectronics Research Centre University of Southampton, Southampton, UK J. W. Dawson, C. W. Siders, J. A. Britten, C. P. J. Barty Lawrence Livermore National Laboratory, 700 East Avenue, Livermore, USA
Transcript
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High Average Power, High Energy, Femto-second High Average Power, High Energy, Femto-second Fiber Chirped Pulse Amplification SystemFiber Chirped Pulse Amplification System
F. He, J. H. V. Price, A. Malinowski, A. Piper, M. Ibsen, D. J. Richardson Optoelectronics Research Centre
University of Southampton, Southampton, UK
J. W. Dawson, C. W. Siders, J. A. Britten, C. P. J. BartyLawrence Livermore National Laboratory, 700 East Avenue, Livermore, USA
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OutlineOutline
Background and motivationBackground and motivation
Conclusion and future workConclusion and future work
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Background and MotivationBackground and Motivation Fiber Chirped Pulse Amplification (CPA) system with high-Fiber Chirped Pulse Amplification (CPA) system with high-
quality, high-energy femto-second pulses, at high average quality, high-energy femto-second pulses, at high average power.power. Applications: industrial materials processing, etc. Applications: industrial materials processing, etc. Fiber systems: high gain, compact and robust, less thermo-optical Fiber systems: high gain, compact and robust, less thermo-optical
problems at high power. problems at high power. Limitations: nonlinear Limitations: nonlinear
effectseffects CompactCompact
Fiber oscillator Fiber oscillator and stretcherand stretcher
The key for The key for achieving high achieving high
PPave ave + E+ E Dielectric gratingDielectric grating
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Experimental setupExperimental setup
Novel technologies:Novel technologies: Mode-Locked Fiber OscillatorMode-Locked Fiber Oscillator CFBG (designed with both 2CFBG (designed with both 2ndnd and 3 and 3rdrd order dispersion order dispersion
compensation matched to the compressor)compensation matched to the compressor) Modelling tools for bandwidth optimizationModelling tools for bandwidth optimization Dielectric GratingDielectric Grating
Bandwidth ModellingBandwidth Modelling A modelling tool was used for predicting the performance of coA modelling tool was used for predicting the performance of complexmplex Yb- Yb-
fiber amplifierfiber amplifier system systems (prediction accuracy shown for single amplifiers s (prediction accuracy shown for single amplifiers below).below).
Simulations were applied to the design of our broad bandwidth multi-Simulations were applied to the design of our broad bandwidth multi-stage stage amplifier amplifier systemsystem..
See: F.HE, et Al., Optics Express v14 pp12846 (2006)
High efficiencyHigh efficiency High compression factor (larger size compared with silica High compression factor (larger size compared with silica
transmission gratings)transmission gratings) High damage threshold (~10 times of gold gratings)High damage threshold (~10 times of gold gratings) High average power handlingHigh average power handling
Specifications of the grating in useSpecifications of the grating in use Groove density ~1780 l/mmGroove density ~1780 l/mm Size ~10cm*20cmSize ~10cm*20cm Efficiency ~95%Efficiency ~95%
See: J.BRITTEN, et Al., QELS 2005, JFB5
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Experiment resultsExperiment results Average output power ~135 W (at final amplifier output)Average output power ~135 W (at final amplifier output)
Pulse energy ~13.5 Pulse energy ~13.5 µµJ (at repetition rate of 10 MHz)J (at repetition rate of 10 MHz)
Spectral clipping due to the size of the grating (performance has been Spectral clipping due to the size of the grating (performance has been improved now)improved now)
(10 MHz)
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Progress and Future workProgress and Future work
Compressor optimizationCompressor optimization
Spectral clipping is removed by applying larger gratings and Spectral clipping is removed by applying larger gratings and mirrorsmirrors
SRSSRS We observed at pulse energy ~ 200We observed at pulse energy ~ 200µµJJ
Future workFuture work
System with high average power (>100W) System with high average power (>100W)
and high pulse energy (>100 and high pulse energy (>100 µµJ).J).
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ConclusionConclusion
We demonstrated an Yb-fiber CPA system incorporating a We demonstrated an Yb-fiber CPA system incorporating a CFBG stretcher, a cascaded chain of bandwidth-optimised CFBG stretcher, a cascaded chain of bandwidth-optimised amplifiers and a dielectric grating compressor. amplifiers and a dielectric grating compressor.
The system produced 135 W average power with pulse energy The system produced 135 W average power with pulse energy of 13.5 µJ. The recompressed pulse duration was 360 fs. of 13.5 µJ. The recompressed pulse duration was 360 fs.
Robust source of high pulse energies at high average powers Robust source of high pulse energies at high average powers should further broaden the applications of femto-second fiber-should further broaden the applications of femto-second fiber-based CPA systems.based CPA systems.
