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题名:
Reflectivity measurement with optical feedback cavity ring-down technique employing a multi-longitudinal-mode diode laser
作者: Zhechao Qu; Yanling Han; Shengming Xiong; and Bincheng Li
出版日期: 2011
会议名称: Proceedings of SPIE
会议日期: 2011
通讯作者: Zhechao Qu
中文摘要: Cavity ring-down (CRD) techniques based on measuring the rate of decay of light intensity inside the optical cavity, are widely used for trace gas analysis and high reflectivity measurement. In this presentation a filtered optical feedback CRD (FOF-CRD) technique employing a multi-longitudinal-mode continuous-wave diode laser is investigated for measuring high reflectivity of high reflective mirrors. The original spectrum of the diode laser without the effect of FOF has two longitudinal modes covering tens of the free spectral ranges (FSR) of the ring down cavity (RDC). Due to the relatively broadband spectrum, the theoretical efficiency of coupling the laser power into the RDC is less than 0.05%. In the FOF-CRD scheme, on the other hand, the FOF induced overall spectrum broadening is experimentally observed, with the diode laser running with several longitudinal modes. However the bandwidth of each longitudinal mode is significantly reduced. The coupling efficiency of the laser power into the RDC is higher than 20% in FOF-CRD technique. The enhancement of the coupling efficiency induced by the FOF effect is nearly three orders of magnitude. High accuracy measurements of high reflectivity are achieved with this simple FOF-CRD scheme.
英文摘要: Cavity ring-down (CRD) techniques based on measuring the rate of decay of light intensity inside the optical cavity, are widely used for trace gas analysis and high reflectivity measurement. In this presentation a filtered optical feedback CRD (FOF-CRD) technique employing a multi-longitudinal-mode continuous-wave diode laser is investigated for measuring high reflectivity of high reflective mirrors. The original spectrum of the diode laser without the effect of FOF has two longitudinal modes covering tens of the free spectral ranges (FSR) of the ring down cavity (RDC). Due to the relatively broadband spectrum, the theoretical efficiency of coupling the laser power into the RDC is less than 0.05%. In the FOF-CRD scheme, on the other hand, the FOF induced overall spectrum broadening is experimentally observed, with the diode laser running with several longitudinal modes. However the bandwidth of each longitudinal mode is significantly reduced. The coupling efficiency of the laser power into the RDC is higher than 20% in FOF-CRD technique. The enhancement of the coupling efficiency induced by the FOF effect is nearly three orders of magnitude. High accuracy measurements of high reflectivity are achieved with this simple FOF-CRD scheme.
收录类别: Ei
语种: 英语
卷号: 8190
文章类型: 会议论文
页码: 81901C
内容类型: 会议论文
URI标识: http://ir.ioe.ac.cn/handle/181551/7851
Appears in Collections:薄膜光学技术研究室(十一室)_会议论文

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作者单位: 中国科学院光电技术研究所

Recommended Citation:
Zhechao Qu,Yanling Han,Shengming Xiong,et al. Reflectivity measurement with optical feedback cavity ring-down technique employing a multi-longitudinal-mode diode laser[C]. 见:Proceedings of SPIE. 2011.
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