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Proceedings Paper

Frequency doubling of focused laser beams for high pulse energy at 471nm
Author(s): Xin Wang; Frank Kallmeyer; Sha Wang; A. Ding; Hans-Joachim Eichler
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Paper Abstract

An actively Q-switched Nd:GSAG laser with 942nm wavelength was frequency doubled in a critically type-I phase-matched LBO. Maximum pulse energy of 8mJ with 300ns pulse duration at 471 nm was obtained with 19mJ incident radiation at 10Hz. The corresponding conversion efficiency was 42%. The frequency doubling of a focused Gaussian beam involves spatially dependent phase mismatching due to beam divergence. It decreases the conversion efficiency and deteriorates the beam quality. According to the theoretical calculation, elliptical focusing was used to improve the second harmonic beam quality and slightly increase the conversion efficiency.

Paper Details

Date Published: 19 February 2009
PDF: 11 pages
Proc. SPIE 7194, Laser Resonators and Beam Control XI, 71940M (19 February 2009); doi: 10.1117/12.823007
Show Author Affiliations
Xin Wang, Technische Univ. Berlin (Germany)
Frank Kallmeyer, Technische Univ. Berlin (Germany)
Sha Wang, Technische Univ. Berlin (Germany)
A. Ding, Technische Univ. Berlin (Germany)
Hans-Joachim Eichler, Technische Univ. Berlin (Germany)

Published in SPIE Proceedings Vol. 7194:
Laser Resonators and Beam Control XI
Alexis V. Kudryashov; Alan H. Paxton; Vladimir S. Ilchenko; Lutz Aschke, Editor(s)

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