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  4. 100 fs pulses directly from a kW-class mJ-level ytterbium-doped fiber CPA laser system
 
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2021
Conference Paper
Title

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

Abstract
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.
Author(s)
Stark, H.
Buldt, J.
Müller, M.
Klenke, A.
Limpert, J.
Mainwork
Fiber Lasers XVIII: Technology and Systems  
Conference
Conference "Fiber Lasers - Technology and Systems" 2021  
DOI
10.1117/12.2579186
Language
English
Fraunhofer-Institut für Angewandte Optik und Feinmechanik IOF  
Keyword(s)
  • chirped pulse amplification

  • coherent beam combination

  • ultrafast fiber lasers

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