High-average power second harmonic generation of femtosecond fiber lasers

S. Hädrich; J. Rothhardt; T. Eidam; T. Gottschall; J. Limpert; A. Tünnermann

doi:10.1117/12.874872

10 February 2011 High-average power second harmonic generation of femtosecond fiber lasers

S. Hädrich, J. Rothhardt, T. Eidam, T. Gottschall, J. Limpert, A. Tünnermann

Proceedings Volume 7914, Fiber Lasers VIII: Technology, Systems, and Applications; 79140S (2011) https://doi.org/10.1117/12.874872
Event: SPIE LASE, 2011, San Francisco, California, United States

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 M² < 1.2.

Citation Download Citation

S. Hädrich, J. Rothhardt, T. Eidam, T. Gottschall, J. Limpert, and A. Tünnermann "High-average power second harmonic generation of femtosecond fiber lasers", Proc. SPIE 7914, Fiber Lasers VIII: Technology, Systems, and Applications, 79140S (10 February 2011); https://doi.org/10.1117/12.874872

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