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Proceedings Article

High-average power second harmonic generation of femtosecond fiber lasers

[+] Author Affiliations
S. Hädrich, J. Rothhardt, T. Eidam, J. Limpert

Friedrich-Schiller-Univ. Jena (Germany) and Helmholtz-Institute Jena (Germany)

T. Gottschall

Friedrich-Schiller-Univ. Jena (Germany)

A. Tünnermann

Friedrich-Schiller-Univ. Jena (Germany) and Helmholtz-Institute Jena (Germany) and Fraunhofer Insitute for Applied Optics and Precision Engineering (Germany)

Proc. SPIE 7914, Fiber Lasers VIII: Technology, Systems, and Applications, 79140S (February 10, 2011); doi:10.1117/12.874872
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From Conference Volume 7914

  • Fiber Lasers VIII: Technology, Systems, and Applications
  • Jay W. Dawson
  • San Francisco, California, USA | January 22, 2011

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.

© (2011) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Citation

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


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