Measurement of M2 factor of 1064 nm pulsed laser based on crossed defocus gratings

被引：0
|
作者：
Ma H. [1 ]
Xi F. [1 ]
Zhou P. [1 ]
Xu X. [1 ]
Chen J. [1 ]
Liu Z. [1 ]
机构：
[1] College of Opt-Electric Science and Engineering, National University of Defense Technology, Changsha
来源：
Guangxue Xuebao/Acta Optica Sinica | 2010年 / 30卷 / 03期
关键词：
Crossed defocus gratings; Laser technique; Measurement of the M2 factor; Pulsed laser beam quality;
D O I：
10.3788/AOS20103003.0821
中图分类号：
学科分类号：
摘要：
It is impossible to measure the M2 factor of pulsed laser effectively by using the traditional equipment. For real-time measurement of the M2 factor, two crossed defocus gratings and a lens with short focal length are used to obtain nine beam spots of different positions. The value of M2 factor is determined by calculating the beam waists using the second-moment method and curve-fitting. According to the theory of Gaussian beam propagation and transformation, measured errors as functions of beam waist and positions are analyzed. The analysis shows that the measuring system can work well in a large range. The pulse-to-pulse M2 factors and the change of M2 factors along with the pumping voltages of the 1064 nm Nd:YAG pulsed laser are measured. The results indicate that measurements of M2 factor of pulsed laser are realized and the system can work successfully for measuring changes of M2 factors during laser working in real time.
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页码：821 / 826
页数：5
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