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Energy scaling of femtosecond and picosecond fiber oscillators beyond the microjoule level

: Ortac, B.; Baumgartl, M.; Schmidt, O.; Hideur, A.; Sagnes, I.; Garnache, A.; Limpert, J.; Tünnermann, A.


Gapontsev, D.V. ; Society of Photo-Optical Instrumentation Engineers -SPIE-, Bellingham/Wash.:
Fiber lasers VI. Technology, systems, and applications : 26 - 29 January 2009, San Jose, California, United States
Bellingham, WA: SPIE, 2009 (Proceedings of SPIE 7195)
ISBN: 978-0-8194-7441-4
Paper 719515
Conference "Fiber Lasers" <6, 2009, San Jose/Calif.>
Conference Paper
Fraunhofer IOF ()

We report on the generation of microjoule level picosecond pulses from a mode-locked Yb-doped LMA fiber laser operating in the purely normal dispersion regime. The self-starting oscillator stabilized with slow relaxation semiconductor saturable absorber (SAM) emits 11 W of average power at a pulse repetition rate of 10 MHz, corresponding to a pulse energy of 1.1 J. The laser produces a 0.4 nm narrow emission line with 310 ps output pulses. In the femtosecond operation, the oscillator stabilized with fast relaxation SAM emits 9 W of average power at a pulse repetition rate of 9.7 MHz, corresponding to a pulse energy of 927 nJ. The laser produces positively chirped output pulses of 8 ps which are compressed down to 711 fs, corresponding to megawatt peak power. To our knowledge this is the first time that mode-locked fiber oscillators can generate higher pulse energies of beyond microjoule-level at high average output power.