光学学报, 2009, 29 (3): 747, 网络出版: 2009-03-17  

高灵敏度调谐式连续波腔衰荡光谱技术

High Sensitivity CW-Cavity Ring Down Spectroscopy of Tuning Wavelength
作者单位
国防科技大学, 湖南, 长沙 410073
摘要
建立了一套以分布反馈式(DFB)激光器为光源的高灵敏度连续波腔衰荡光谱测量系统, 该系统利用DFB激光器的电流调谐特点使激光在衰荡腔内谐振, 利用其电流调制的特点实现入射光的关断, 进行衰荡测量。对标准具效应消除前后的系统进行了测试, 结果表明, 前后系统等噪声探测灵敏度分别为2.56×10-7 cm-1和1.27×10-8 cm-1。以衰荡腔的纵模间隔为扫描步长对6591.43 cm-1处N2O的氮气加宽线宽系数进行了测量, 测量结果分别为0.0819 cm-1和0.0808 cm-1, 对测量结果与HITRAN2004数据库中参数间的差别进行了讨论。
Abstract
A high-sensitivity system of CW-cavity ring down spectroscopy is built with a distributed-feedback diode laser as light source. In which, the incident laser is in resonances with the mode of passive optical cavity via tuning the diode laser′s wavelength, and the switching off of laser is carried via modulating the diode laser′s current. The CW-CRDS system with and without etaloning effects is measured, and experiment shows that theirnoise-equivalent detection sensitivity is 2.56×10-7 cm-1 and 1.27×10-8 cm-1 respectively. The N2 broadening halfwidth of N2O molecule at 6591.43 cm-1 is measured with the longitudinal mode spacing of cavity as step of wavelength scanning, the measured half-width at half-maximum of line is 0.0819 cm-1, and 0.0808 cm-1, then the different between measurement value and HITRAN2004 database is discussed.

谭中奇, 龙兴武, 黄云. 高灵敏度调谐式连续波腔衰荡光谱技术[J]. 光学学报, 2009, 29(3): 747. Tan Zhongqi, Long Xingwu, Huang Yun. High Sensitivity CW-Cavity Ring Down Spectroscopy of Tuning Wavelength[J]. Acta Optica Sinica, 2009, 29(3): 747.

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