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- W2025441630 abstract "We present second harmonic generation of a high average power, high energy femtosecond Yb doped fiber chirped pulse amplifier. This system is operated at various repetition rates at a central wavelength of 1040 nm. After two pre-amplification stages a main amplifier is used to achieve the required pulse energy for efficient second harmonic generation. It is comprised of a 1.2 m long photonic crystal fiber with a mode field diameter of 45 μm. A dielectric grating based compressor is used for compression to a pulse duration of about 406 fs. Second harmonic generation is then achieved in a 500 μm thick BBO crystal. The conversion efficiency of the second harmonic generation remained almost constant at >60 % for all repetition rates and average power levels. At 5.25 MHz the highest average power of 135 W at 520 nm was achieved. In addition this comes with an excellent beam quality which is validated by a measured M<sup>2</sup> < 1.2." @default.
- W2025441630 created "2016-06-24" @default.
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- W2025441630 date "2011-02-10" @default.
- W2025441630 modified "2023-09-23" @default.
- W2025441630 title "High-average power second harmonic generation of femtosecond fiber lasers" @default.
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- W2025441630 doi "https://doi.org/10.1117/12.874872" @default.
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