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Proceedings Paper

High-average power second harmonic generation of femtosecond fiber lasers
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Paper 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.

Paper Details

Date Published: 10 February 2011
PDF: 6 pages
Proc. SPIE 7914, Fiber Lasers VIII: Technology, Systems, and Applications, 79140S (10 February 2011);
Show Author Affiliations
S. Hädrich, Friedrich-Schiller-Univ. Jena (Germany)
Helmholtz-Institute Jena (Germany)
J. Rothhardt, Friedrich-Schiller-Univ. Jena (Germany)
Helmholtz-Institute Jena (Germany)
T. Eidam, Friedrich-Schiller-Univ. Jena (Germany)
Helmholtz-Institute Jena (Germany)
T. Gottschall, Friedrich-Schiller-Univ. Jena (Germany)
J. Limpert, Friedrich-Schiller-Univ. Jena (Germany)
Helmholtz-Institute Jena (Germany)
A. Tünnermann, Friedrich-Schiller-Univ. Jena (Germany)
Helmholtz-Institute Jena (Germany)
Fraunhofer Insitute for Applied Optics and Precision Engineering (Germany)

Published in SPIE Proceedings Vol. 7914:
Fiber Lasers VIII: Technology, Systems, and Applications
Jay W. Dawson, Editor(s)

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