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Efficient frequency conversion of pulsed microchip and fiber laser radiation in PPSLT

: Jungbluth, B.; Nyga, S.; Pawlowski, E.; Fink, T.; Wueppen, J.

Fulltext urn:nbn:de:0011-n-1710440 (1.0 MByte PDF)
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Copyright 2011 Society of Photo-Optical Instrumentation Engineers. One print or electronic copy may be made for personal use only. Systematic reproduction and distribution, duplication of any material in this paper for a fee or for commercial purposes, or modification of the content of the paper are prohibited.
Created on: 28.4.2012

Clarkson, W.A. ; Society of Photo-Optical Instrumentation Engineers -SPIE-, Bellingham/Wash.:
Solid state lasers XX. Technology and devices : 23 - 27 January 2011, San Francisco, California, United States
Bellingham, WA: SPIE, 2011 (Proceedings of SPIE 7912)
ISBN: 978-0-8194-8449-9
Paper 79120K
Conference "Solid State Lasers - Technology and Devices" <20, 2011, San Francisco/Calif.>
Photonics West Conference <2011, San Franciso/Calif.>
Conference Paper, Electronic Publication
Fraunhofer ILT ()

Extensive studies on frequency doubling with ppSLT crystals are presented. This includes a detailed discussion on design aspects and theoretical modeling predictions as well as experimental studies comparing the performance of ppSLT crystals from different providers with and without MgO doping. Experimental analyses of their acceptance parameters and crystal homogeneity are conducted with a pulsed microchip laser with low peak (6 kW) and low average power (50 mW) resulting in a maximum conversion efficiency of up to 80 % for high quality MgO doped crystals. Based on these results a compact converter module with fiber coupling is designed and tested with the radiation from the microchip laser and a fiber laser source in comparison. The fiber laser provides an average power of about 1 W. Even at this - still very moderate - power level a significant efficiency drop can be observed. Despite the advantage of higher pulse peak (25 kW) power from the fiber laser source, caref ul design adaptations of the converter are required even to preserve a conversion efficiency beyond 50%.