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题名:
Measuring surface deformation of optical components with surface thermal lens technique
作者: Mingqiang Liu,Bincheng Li,Yanru Wang,Honggang Hao
出版日期: 2008
会议名称: PROCEEDINGS OF THE SOCIETY OF PHOTO-OPTICAL INSTRUMENTATION ENGINEERS (SPIE)
学科分类: 光学薄膜技术
中文摘要: When a modulated laser beam irradiates an optical component, the laser-induced surface deformation has both direct current (DC) and alternating current (AC) portions. Explicit surface deformation and surface thermal lens (STL) theory models are developed to describe the DC and AC portions of the surface deformation and corresponding STL signals. Experimentally, a setup combining laser calorimetry (LC) and STL technique is developed to measure the absolute absorptance and laser-induced surface deformation of optical components. The absorptance measurement is implemented by LC with excellent stability and repeatability. The surface deformation measurement is realized with STL amplitude by defining an approximately linear relationship between the AC (or DC) STL amplitude and the maximum AC (or DC) deformation. As an example, the deformation value of a BK7 substrate coated with a TiO/sub 2//SiO/sub 2/ film stack of absolute absorptance 1.32*10/sup -3/, irradiated by a 1064 nm laser with 3.8 W power is determined to be 34.3 nm with the experimental STL amplitude, in good agreement with the theoretical value of 35.8 nm calculated by the explicit surface deformation model. An indirect approach is proposed to determine accurately the irradiation beam radius by fitting the experimental data of the radial AC intensity change at the detection plane to the explicit STL model. By performing a theoretical fit to the experimental frequency dependence of the STL amplitude, the thermal properties of the optical component (i.e. the thermal diffusivity) can also be determined.
收录类别: 其他
语种: 英语
卷号: 7132
ISSN号: 0361-0763
文章类型: 会议论文
内容类型: 会议论文
URI标识: http://ir.ioe.ac.cn/handle/181551/1857
Appears in Collections:薄膜光学技术研究室(十一室)_会议论文

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Mingqiang Liu,Bincheng Li,Yanru Wang,Honggang Hao. Measuring surface deformation of optical components with surface thermal lens technique[C]. 见:PROCEEDINGS OF THE SOCIETY OF PHOTO-OPTICAL INSTRUMENTATION ENGINEERS (SPIE).
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文件名: 2008-193.pdf
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