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High power high energy ultrafast fiber amplifiers
Yoann Zaouter1,2 1 CELIA, UMR 5107 CNRS - Université de Bordeaux 1, France 2 Amplitude Systèmes, Pessac, France
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Interests of Yb-doped fibers as amplifier medium
Outline of the talk Interests of Yb-doped fibers as amplifier medium How to use the advantages of fibers ? How to handle or avoid disadvantages of fibers? The double-clad yb-doped fiber concept The micro-structured fibers High power / High energy fiber amplifiers Existing systems Perspectives The ANR project LAL / Amplitude Systemes
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High power / High energy CPA systemes
High average power 131W, 220fs fiber laser system Röser et al., Optics Letters, vol. 30, n°20 (2005) Jena group – Jens Limpert High energy Liao et al. CLEO 2006 Postdeadline CPDB4 Michigan group – Almantas Galvanauskas
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High power / High energy CPA systemes
High average power 131W, 220fs fiber laser system Röser et al., Optics Letters, vol. 30, n°20 (2005) Jena group – Jens Limpert High energy Liao et al. CLEO 2006 Postdeadline CPDB4 Michigan group – Almantas Galvanauskas
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High average power CPA system Femtosecond oscillator
Grating stretcher 150 fs pulses 73 MHz FT limited pulses Compressor Fiber amplifier
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High average power CPA system Femtosecond oscillator
Grating stretcher 250 ps stretched pulses Small size gold gratings Femtosecond oscillator Compressor Fiber amplifier 150 fs, 73 MHz Gold grating-based strectcher
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High average power CPA system Femtosecond oscillator
40µm core diameter 17dB/m absorption @ 976nm Reduced non-linearities Femtosecond oscillator Grating stretcher Compressor Fiber amplifiers Laser Diode Laser Diode 150 fs, 73 MHz 40/170 40/170 OI Gold grating-based strectcher F. Röser et al. Optics letters, 30, p2754, 2005
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High average power CPA system Femtosecond oscillator
Grating stretcher Compressor Fiber amplifiers Laser Diode Laser Diode 150 fs, 73 MHz 40/170 40/170 OI Gold grating-based strectcher F. Röser et al. Optics letters, 30, p2754, 2005
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High average power CPA system
Femtosecond oscillator Grating stretcher High efficiency transmission gratings Fiber amplifiers Compressor Laser Diode Laser Diode 150 fs, 73 MHz 40/170 40/170 OI Transmission grating compressor Gold grating-based strectcher F. Röser et al. Optics letters, 30, p2754, 2005
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High average power CPA system
Femtosecond oscillator Grating stretcher Fiber amplifiers Compressor Laser Diode Laser Diode 150 fs, 73 MHz 40/170 40/170 OI Transmission grating compressor Gold grating-based strectcher F. Röser et al. Optics letters, 30, p2754, 2005
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High average power CPA system
Femtosecond oscillator Grating stretcher Fiber amplifiers Compressor Laser Diode Laser Diode 150 fs, 73 MHz 40/170 40/170 OI Transmission grating compressor Gold grating-based strectcher F. Röser et al. Optics letters, 30, p2754, 2005
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High average power CPA system
131 W average power 220 fs duration 1.8µJ per pulse 73 MHz Femtosecond oscillator Grating stretcher Compressor Fiber amplifiers Laser Diode Laser Diode 150 fs, 73 MHz 40/170 40/170 OI Transmission grating compressor Gold grating-based strectcher F. Röser et al. Optics letters, 30, p2754, 2005
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High power / High energy CPA systemes
High average power 131W, 220fs fiber laser system Röser et al., Optics Letters, vol. 30, n°20 (2005) Jena group – Jens Limpert High energy Liao et al. CLEO 2006 Postdeadline CPDB4 Michigan group – Almantas Galvanauskas
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High energy CPA system Amplified seed source Fiber laser
+ single mode pré amplifier Grating stretcher Compressor Fiber amplifiers LDD PC TEC oscillator
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High energy CPA system Grating stretcher Up to 980ps duration
Large size gold grating Amplified seed source Compressor Fiber amplifiers LDD PC TEC oscillator
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High energy CPA system 2 pre-amplifiers
Division of repetition rate and pulse cleanup Amplified seed source Grating stretcher Compressor Fiber amplifiers LDD PC TEC oscillator LDD LDD TEC TEC AOM AOM
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High energy CPA system 2 power amplifiers 30µm and 65µm core diameter
13dB/m absorption Amplified seed source Grating stretcher Compressor Fiber amplifiers LDD PC TEC oscillator LDD LDD TEC TEC AOM AOM 975-nm pump 30-um LMA 1-m long 65-um LMA 975-nm pump
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High energy CPA system Gold grating based compressor 60% efficiency
Amplified seed source Grating stretcher Fiber amplifiers Compressor LDD PC TEC oscillator LDD LDD TEC TEC AOM AOM 975-nm pump 30-um LMA 1-m long 65-um LMA 975-nm pump
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High energy CPA system PC Amplified seed source Grating stretcher
Compressor Fiber amplifiers LDD PC TEC oscillator LDD LDD TEC TEC AOM AOM 975-nm pump 30-um LMA 1-m long 65-um LMA 975-nm pump
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High energy CPA system High energy CPA system
Amplified seed source Grating stretcher 980ps stretched pulses Up to 1.5mJ energy Expected energy limitations: Bulk damage at 6.6mJ Self focusing at >5mJ Saturation fluence at 1.4mJ Compressor Fiber amplifiers 20µJ seed
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Amplified pulse intensity autocorrelation
High energy CPA system High energy CPA system Amplified 800-µJ 980-ps stretched Recompressed 500-µJ 520-fs Amplified seed source Grating stretcher Compressor Fiber amplifiers Amplified pulse intensity autocorrelation Amplified pulse spectrum
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Record performances but …
High energy CPA system High energy CPA system Amplified 800-µJ 980-ps stretched Recompressed 500-µJ 520-fs Amplified seed source Grating stretcher Compressor Fiber amplifiers Record performances but … Power amplifiers are highly multimode Experiment is believed to be unstable and super-sensitive to misalignments Solution not likely to be used in commercial products
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Interests of Yb-doped fibers as amplifier medium
Outline of the talk Interests of Yb-doped fibers as amplifier medium How to use the advantages of fibers ? How to handle or avoid disadvantages of fibers? The double-clad yb-doped fiber concept The micro-structured fibers High power / High energy fiber amplifiers Existing systems Perspectives The ANR project LAL / Amplitude Systemes
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ANR LAL / Amplitude Systemes
Context of the project Seed source for a laser/e- Compton scattering high finess cavity Intense polarized positron source
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ANR LAL / Amplitude Systemes
Context of the project Seed source for a laser/e- Compton scattering high finess cavity Intense polarized positron source Next generation linearly polarized positron/electron colliders Scenarios beyond the standard model : supersymetry, terascale generation, extra-dimensions, dark matter, superstring…
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ANR LAL / Amplitude Systemes Femtosecond oscillator
200 fs pulses 40 to 70 MHz FT limited pulses Synchro locked : Servo motor Piezo actuator Grating stretcher Compressor Fiber amplifier
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ANR LAL / Amplitude Systemes Femtosecond oscillator
Grating stretcher 250 ps stretched pulses Standard high efficiency transmission gratings Femtosecond oscillator Compressor Fiber amplifier
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ANR LAL / Amplitude Systemes Femtosecond oscillator
PM-LMA fiber ampli. High pump absorption Polarized output beam High gain Femtosecond oscillator Grating stretcher Compressor Fiber amplifiers Laser Diode PM - LMA fiber
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ANR LAL / Amplitude Systemes Femtosecond oscillator
PM-LMA fiber ampli. High pump absorption Polarized output beam PCF-Fiber amplifier High launch power >800W pump power Reduced non-linearities Femtosecond oscillator Grating stretcher Compressor Fiber amplifiers Laser Diode PM - LMA fiber PCF fiber OI High power Laser Diode > 300W average power Linearly polarized beam
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ANR LAL / Amplitude Systemes Femtosecond oscillator
Specially designed high efficiency transmission gratings >200W final output power ~1ps duration 40-70 MHz Synchro-locked Femtosecond oscillator Grating stretcher Fiber amplifiers Compressor Laser Diode PM - LMA fiber PCF fiber OI High power Laser Diode
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ANR LAL / Amplitude Systemes
Injection in a super high finess FB-cavity Gain ~ 104 – 105 Small interaction region Multi-MW pulses stacked Non-planar geometry Circular polarization Polarized positrons source Femtosecond oscillator Grating stretcher Laser system designed by Amplitude Systemes Compressor Fiber amplifiers Laser input e- beam
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ANR LAL / Amplitude Systemes
FPGA control Laser intensity Laser frequency Laser phase Cavity parameters Cavity locking Etc… Femtosecond oscillator Grating stretcher Laser system designed by Amplitude Systemes Compressor Fiber amplifiers 1 2 3 4 FPGA-based controle 5 Laser input e- beam
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Presented the best performances to date
Conclusion Presented the best performances to date High power fibre-CPA High energy fibre-CPA Design of the project submitted to ANR Very high power 1-ps amplifier with a synchro-locked laser seed Non-planar FP-cavity FPGA global control of the experiment Installation at KEK / ATF Production of polarized positrons
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Thank you Visit our websites @: www.amplitude-systemes.com
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