基于外腔二极管激光器，采用电流调制的噪声免疫腔增强光外差分子光谱技术对痕量气体的检测
External cavity diode laser-based detection of trace gases with NICE-OHMS using current modulation.
作者信息
Centeno R, Mandon J, Cristescu S M, Axner O, Harren F J M
出版信息
Opt Express. 2015 Mar 9;23(5):6277-82. doi: 10.1364/OE.23.006277.
We combine an external cavity diode laser with noise-immune cavity-enhanced optical heterodyne molecular spectroscopy (NICE-OHMS) using current modulation. With a finesse of 1600, we demonstrate noise equivalent absorption sensitivities of 4.1 x 10(-10) cm(-1) Hz(-1/2), resulting in sub-ppbv detection limits for Doppler-broadened transitions of CH(4) at 6132.3 cm(-1), C(2)H(2) at 6578.5 cm(-1) and HCN at 6541.7 cm(-1). The system is used for hydrogen cyanide detection from sweet almonds.
我们将外腔二极管激光器与采用电流调制的抗噪声腔增强光学外差分子光谱技术（NICE - OHMS）相结合。凭借1600的精细度，我们展示了4.1×10⁻¹⁰ cm⁻¹ Hz⁻¹/²的噪声等效吸收灵敏度，这使得在6132.3 cm⁻¹处CH₄、6578.5 cm⁻¹处C₂H₂以及6541.7 cm⁻¹处HCN的多普勒展宽跃迁的检测限达到亚ppbv级别。该系统用于检测甜杏仁中的氰化氢。
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