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Microjoule-level all-polarization-maintaining femtosecond fiber source

: Schreiber, T.; Nielsen, C.K.; Ortac, B.; Limpert, J.; Tünnermann, A.


Optics Letters 31 (2006), No.5, pp.574-576
ISSN: 0146-9592
Journal Article
Fraunhofer IOF ()

We report on a high-power, high-energy femtosecond fiber source based on direct amplification of parabolic pulses from an environmentally stable passively mode-locked fiber oscillator in an Yb-doped single-polarization photonic crystal fiber. The special pulse shape allows for the generation of high-quality femtosecond pulses beyond nonlinearity limits. The system delivers a pulse energy of 1.2 µJ (21 W average power) at a repetition rate of 17 MHz and a pulse duration of 240 fs in a linearly polarized beam with diffraction-limited quality.