利用光参量振荡器测量腔内增强吸收光谱(英文)

Cavity Enhanced Absorption Spectrum Measurement Using an Optical Parametric Oscillator

利用光参量振荡器(OPO)实现了腔内增强吸收光谱(CEAS)。实验使用了线性吸收腔。利用压电陶瓷对吸收腔的反射镜进行扰动,得到光的输出。通过测量乙烷(C2H6)在2996.9μm附近的CEAS,确定了系统的检测灵敏度。在总的腔镜反射率为98.5%的情况下,系统的最小可检测吸收系数为2.3×10-5cm-1,相应的C2H6的测量极限为690ppb。

The cavity enhanced absorption spectrum(CEAS) was carried out with a newly developed tunable optical parametric oscillator(OPO).A linear cavity was used in the experiments.Light transmission through the cavity was obtained by jittering the cavitylength with a piezo on one of the mirrors.The sensitivity of the system was determined by recording the absorption of ethane(C2H6) at 2.996 μm.A minimum detectable absorption coefficient of 2.3×10-5 cm-1 was achieved with a total mirror reflectivity of 98.5 %,corresponding to an C2H6 detection limit of 690 ppb.