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100 fs pulses directly from a kW-class mJ-level ytterbium-doped fiber CPA laser system

: Stark, H.; Buldt, J.; Müller, M.; Klenke, A.; Limpert, J.


Zervas, M.N. ; Society of Photo-Optical Instrumentation Engineers -SPIE-, Bellingham/Wash.:
Fiber Lasers XVIII: Technology and Systems : 6-11 March 2021, Online Only, United States
Bellingham, WA: SPIE, 2021 (Proceedings of SPIE 11665)
ISBN: 978-1-5106-4165-5
ISBN: 978-1-5106-4166-2
Paper 116651G, 6 S.
Conference "Fiber Lasers - Technology and Systems" <18, 2021, Online>
Fraunhofer IOF ()
chirped pulse amplification; coherent beam combination; ultrafast fiber lasers

We present a large-bandwidth high-power, high-energy fiber laser system based on coherent beam combination of 16 ytterbium-doped rod-type amplifiers. The CPA pulse stretching as well as extensive spectral shaping to counteract gain narrowing are implemented in a mostly fiber-integrated front end. A two-staged and partially helium-filled CPA grating compressor allows to compress the amplified pulses while maintaining a nearly diffraction-limited beam quality. Two laser operation regimes were investigated. The first one aimed for the shortest possible pulse duration, whereby 106 fs were reached at an average power of 910 W and a pulse energy of 910 µJ. In a second experiment, the primary aim of increasing the average power to 1 kW and the pulse energy to 10 mJ was successfully reached while the secondary objective, again being a minimum pulse duration, was optimized to 120 fs, posing a record value for fiber-CPA systems at this performance level.