Influence of spherical aberrations on fundamental mode beam quality under different laser resonators
Xiang Zhen(项震)a), Hu Miao(胡淼)b), Ge Jian-Hong(葛剑虹)a)†, Zhao Zhi-Gang(赵智刚)a), Wang Sha(汪莎)a), Liu Chong(刘崇)a), and Chen Jun(陈军)a)
a State Key Laboratory of Modern Optical Instrumentation, Zhejiang University, Hangzhou 310027, China; b College of Communication, Hangzhou University of Electronic Science and Technology, Hangzhou 310037, China
Abstract Spherical aberrations of the thermal lens of the active media are severe when solid state lasers are strongly pumped. The fundamental mode profile deteriorates due to the aberrations. Self-consistent modes of a resonator with aberrations are calculated by using the Fox--Li diffraction iterative algorithm. Calculation results show that the aberration induced fundamental mode beam quality deterioration depends greatly on the resonator design. The tolerance of a flat--flat resonator to the aberration coefficient is about 30$\lambda$ in the middle of stability, where $\lambda$ is the wavelength of laser beam. But for a dynamically stable resonator, 2$\lambda$ of spherical aberration will create diffraction loss of more than 40%, if inappropriate design criteria are used. A birefringence compensated laser resonator with two Nd:YAG rods is experimentally studied. The experimental data are in quite good agreement with simulation results.
Received: 29 December 2008
Revised: 16 January 2009
Accepted manuscript online:
Fund: Project supported
by the National Natural Science Foundation --the Science Foundation
of China Academy of Engineering Physics (NSAF) (Grant No 10876037)
and China Postdoctoral Science Foundation (Grant
No 20080441238).
Cite this article:
Xiang Zhen(项震), Hu Miao(胡淼), Ge Jian-Hong(葛剑虹), Zhao Zhi-Gang(赵智刚), Wang Sha(汪莎), Liu Chong(刘崇), and Chen Jun(陈军) Influence of spherical aberrations on fundamental mode beam quality under different laser resonators 2009 Chin. Phys. B 18 2806
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