Open AccessStudy of acousto-optic Q-switched green laser with high efficiency，high stability and high-quality coherent beam generation
Author(s) -
Yuping Zhang,
Huiyun Zhang,
Kai Zhong,
Peng Wang,
Li Xi-Fu,
Jianquan Yao
Publication year - 2009
Publication title -
wuli xuebao
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.199
H-Index - 47
ISSN - 1000-3290
DOI - 10.7498/aps.58.3193
Subject(s) - laser beam quality , optics , m squared , laser , energy conversion efficiency , materials science , power (physics) , diode , beam (structure) , q switching , laser power scaling , beam parameter product , slope efficiency , physics , optoelectronics , fiber laser , laser beams , quantum mechanics
High-power and high efficient coherent beam generation with good green-beam quality has been achieved by optimizing the diode-side-pumped linear cavity geometry with two modules in tandem, acousto-optic Q-switching and with S-KTP of Ⅱ-type phase-matching for intracavity frequency doubling of a NdYAG laser. When the pump current is 45A, the maximum average green output power of 132 W is obtained with pulse width of 120 ns at pulse repetition rate of 15 kHz, corresponding to the conversion efficiency of 132% from diode pump power to green output power. The M2 beam quality factor is 67 at output power of 130 W, and the output power instability is less than 05% at the same output power during an hour measurement time. The thermo-lensing effect of the laser medium and the stable region of the laser cavity under high power pumping are also theoretically analyzed and experimentally researched.