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23 February 2006 Compact μJ-level all-polarization maintaining femtosecond fiber source
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We report on a high power, high-energy femtosecond fiber source based on direct amplification of parabolic pulses from an environmental stable passively mode-locked fiber oscillator in an Yb-doped single-polarization photonic crystal fiber. 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. The special pulse shape allows for the generation of high quality femtosecond pulses beyond nonlinearity limits, which is confirmed by numerical simulations.
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T. Schreiber, B. Orta, C. K. Nielsen, J. Limpert, and A. Tünnermann "Compact μJ-level all-polarization maintaining femtosecond fiber source", Proc. SPIE 6102, Fiber Lasers III: Technology, Systems, and Applications, 610211 (23 February 2006);

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