Frequency doubling of focused laser beams for high pulse energy at 471nm

被引：1
|
作者：
Wang, Xin [1 ]
Kallmeyer, Frank [1 ]
Wang, Sha [1 ]
Ding, A. [1 ]
Eichler, Hans-Joachim [1 ]
机构：
[1] Tech Univ Berlin, Inst Opt & Atomare Phys, D-10623 Berlin, Germany
来源：
LASER RESONATORS AND BEAM CONTROL XI | 2009年 / 7194卷
关键词：
High energy; second harmonic generation (SHG); elliptical Gaussian beam; GENERATION; ND; NM;
D O I：
10.1117/12.823007
中图分类号：
O43 [光学];
学科分类号：
070207 ; 0803 ;
摘要：
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.
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页数：11
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