High power Yb:YAG single-crystal fiber amplifiers for femtosecond lasers

Abstract : (100 mots): Yb:YAG single crystal fiber (SCF) amplifiers have recently attracted a lot of interest in the field of ultra-short pulses amplification. In this work, we report on the use of SCF amplifier for the amplification of femtosecond pulses in master oscillator power amplifier configuration to achieve high energy / high average power pulses in view of high speed material processing (surface structuring, drilling) with radial or azimuthal polarization. In preliminary studies, we demonstrate a two stages diode-pumped Yb:YAG single crystal fiber amplifier to achieve femtosecond pulses at an average power of 70W at 20 MHz. Abstract (250 mots) Diode-pumped Yb-doped solid-state lasers implemented in Master Oscillator Power Amplifier (MOPA) configuration clearly dominate the field of high-average power pulsed laser. Thanks to a very efficient thermal management and a high overlap between pump and signal beams brought by the pump guiding, the single-crystal-fiber (SCF) technology has recently shown strong potentialities for the amplification of ultrashort pulses. In this work, we present the use of Yb:YAG SCF (1% Yb doped 1mm diameter, 40mm long) for high average power amplification. As a seed, we used a passively-modelocked Yb-based laser delivering ultra-short pulses at 20MHz with an average power of 1,5W and a duration of 360fs at 1031nm. The SCF amplifier consists in two double-pass stages based on SCF (Taranis modules). The first amplification stage is pumped by a high brightness fiber-coupled laser diode producing 120W at 940nm. After a double-pass, the output power is multiplied by 10, reaching 15W of average power. The second amplification stage consists in a double-pass booster amplifier pumped by a high power fiber-coupled laser diode producing 200W at 969nm to lower the thermal load. After this double pass, the output power reaches 70W (M 2 =1.2) with 600 fs pulses. Optimized length and doping rate of each SCF and different experimental configurations are under study to increase the performances. Furthermore, using a polarization converter, the amplification of radially and azimuthally polarized beam will be investigated in order to achieve high-energy cylindrically polarized femtosecond pulses needed for high-speed material processing applications (surface structuring, drilling).
Type de document :
Communication dans un congrès
Photonics West 2015, LASE, Conference on Solid State Lasers XXIV - Technology and Devices, Feb 2015, San Fransisco United States. Proc. SPIE, 9342, pp.934203, 〈10.1117/12.2079045〉
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Soumis le : jeudi 1 septembre 2016 - 14:15:14
Dernière modification le : jeudi 11 janvier 2018 - 06:26:34

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Fabien Lesparre, Igor Martial, Julien Didierjean, Wolfgang Pallmann, Bojan Resan, et al.. High power Yb:YAG single-crystal fiber amplifiers for femtosecond lasers. Photonics West 2015, LASE, Conference on Solid State Lasers XXIV - Technology and Devices, Feb 2015, San Fransisco United States. Proc. SPIE, 9342, pp.934203, 〈10.1117/12.2079045〉. 〈hal-01358810〉

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