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题名: Output beam analysis of an unstable resonator with a large Fresnel number for a chemical oxygen iodine laser
作者: Yu, DL;  Sang, FT;  Jin, YQ;  Sun, YZ
关键词: chemical oxygen iodine laser ;  fast Fourier transform ;  initial misalignment ;  small signal gain
刊名: OPTICAL ENGINEERING
发表日期: 2002-10-01
DOI: 10.1117/1.1499971
卷: 41, 期:10, 页:2668-2674
收录类别: SCI
文章类型: Article
WOS标题词: Science & Technology ;  Physical Sciences
类目[WOS]: Optics
研究领域[WOS]: Optics
英文摘要: During the operation of a laser in an unstable resonator with a large Fresnel number, as the output power of a chemical oxygen iodine laser (COIL) is increased, instability in the output laser beam will occur, behaving mainly as far-field beam spot drift and deformation. To interpret this phenomenon, a simulation of the output beam mode of this kind of laser was developed by using the method of fast Fourier transform. From the result of calculation, we propose that the presence of the nonuniform gain in the COIL produces a skewed output intensity distribution, which causes the mirror to tilt and bulge due to thermal expansion. As the output power is increased, the mirror surface, especially the back of the scraper mirror, will absorb more and more heat, causing thermal expansion of the mirror front surface to occur more seriously, thus resulting in the tilting and deformation of the far-field beam spot. The initial misalignment of the direction is also an important factor leading to far-field beam Spot drift and deformation. (C) 2002 Society of Photo-Optical Instrumentation Engineers.
关键词[WOS]: GAIN
语种: 英语
WOS记录号: WOS:000178713900039
Citation statistics: 
内容类型: 期刊论文
URI标识: http://cas-ir.dicp.ac.cn/handle/321008/139072
Appears in Collections:中国科学院大连化学物理研究所_期刊论文

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作者单位: 1.Chinese Acad Sci, Dalian Inst Chem Phys, Dalian 116023, Peoples R China

Recommended Citation:
Yu, DL,Sang, FT,Jin, YQ,et al. Output beam analysis of an unstable resonator with a large Fresnel number for a chemical oxygen iodine laser[J]. OPTICAL ENGINEERING,2002,41(10):2668-2674.
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