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题名: Output beam drift and deformation in high-power COIL
作者: Yu, DL;  Sang, FT;  Jin, YQ;  Sun, YZ
关键词: chemical oxygen iodine laser (COIL) ;  finite element analysis (FEA) ;  unstable resonator
刊名: OPTICS AND LASER TECHNOLOGY
发表日期: 2003-06-01
DOI: 10.1016/S0030-3992(02)00178-0
卷: 35, 期:4, 页:245-249
收录类别: SCI
文章类型: Article
WOS标题词: Science & Technology ;  Physical Sciences
类目[WOS]: Optics ;  Physics, Applied
研究领域[WOS]: Optics ;  Physics
英文摘要: During the operation of a chemical oxygen iodine laser (COIL) with an unstable resonator of a large Fresnel number, as the output power increases, an instability of the output laser beam will appear, behaving mainly as far-field beam spot drift and deformation. In order to interpret this phenomenon, thermal expansion analysis on the scraper with finite element analysis method and a simulation of the output beam mode of this kind of laser by the method of Fast Fourier Transform were developed. From the experimental measurement and the calculation, we proposed that the presence of the nonuniform temperature distribution of scraper causes the front surface of the scraper to tilt and bulge due to thermal expansion. As the output power is increasing, all the mirror surfaces, especially the scraper's, 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 the far-field beam spot drift and deformation. (C) 2003 Elsevier Science Ltd. All rights reserved.
关键词[WOS]: GAIN
语种: 英语
WOS记录号: WOS:000182289000002
Citation statistics: 
内容类型: 期刊论文
URI标识: http://cas-ir.dicp.ac.cn/handle/321008/138326
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.Nanyang Technol Univ, Sch Elect & Elect Engn, EEE, Singapore 639798, Singapore
2.Chinese Acad Sci, Dalian Inst Chem Phys, Dalian 116023, Peoples R China

Recommended Citation:
Yu, DL,Sang, FT,Jin, YQ,et al. Output beam drift and deformation in high-power COIL[J]. OPTICS AND LASER TECHNOLOGY,2003,35(4):245-249.
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