Simulations and experiments on optical inner-channel thermal deformation for high-power laser system

	Simulations and experiments on optical inner-channel thermal deformation for high-power laser system
	Guo R.; Chen N.; Shi K.; Wang B.; Shi L.
	2013
发表期刊	Hongwai yu Jiguang Gongcheng/Infrared and Laser Engineering
ISSN	ISBN/10072276
卷号	42 期号:11
摘要	In order to research the influence on the beam quality due to cumulative effect of the inner channel thermal deformation in the high energy laser system, the theoretical simulation and experimental study were performed. Firstly, three typical laser power 10 kW, 50 kW and 100 kW with the unstable resonator were selected to analyze thermal deformation of mirror through the finite element analyze of thermodynamics instantaneous method. Then the wave front aberration could be calculated by ray-tracing theory. Finally, Strehl ratio, parameter of far-filed beam can be calculated and comparably analyzed by Fresnel diffraction integration. The simulation results show that due to the effect of inner channel thermal deformation, eccentric phenomenon and astigmatism of far-filed beam emerge, and peak power and the focused ability decrease. With the increasing of reflection times, Strehl ratio decreases and parameter increases, and tilt, astigmatism and coma of x direction gradually increase, which become the main aberration. Comparing with above theoretical simulation study, the thermal deformation experimental platform was built to measure the single copper mirror of 99% reflectivity with the 10 kW TEA CO2 laser. Through the equivalent scale rule, the experimental results can also represent the 50 kW and 100 kW power level. The measurement precision of thermal deformation of mirror is smaller than A/15 and agree well with the simulation results. The results show that the thermal deformation of mirror cannot be neglected when the laser power great than 10 kW and has a great influence on the far-field transmission properties with the power increasing and reflection times. These results can also provide the reference to the thermal aberration analyze for high power laser system and can be applied to the field of laser nuclear fusion and laser weapon etc.
收录类别	EI
语种	英语
文献类型	期刊论文
条目标识符	http://ir.ciomp.ac.cn/handle/181722/40852
专题	中科院长春光机所知识产出
推荐引用方式 GB/T 7714	Guo R.,Chen N.,Shi K.,et al. Simulations and experiments on optical inner-channel thermal deformation for high-power laser system[J]. Hongwai yu Jiguang Gongcheng/Infrared and Laser Engineering,2013,42(11).
APA	Guo R.,Chen N.,Shi K.,Wang B.,&Shi L..(2013).Simulations and experiments on optical inner-channel thermal deformation for high-power laser system.Hongwai yu Jiguang Gongcheng/Infrared and Laser Engineering,42(11).
MLA	Guo R.,et al."Simulations and experiments on optical inner-channel thermal deformation for high-power laser system".Hongwai yu Jiguang Gongcheng/Infrared and Laser Engineering 42.11(2013).

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