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Cavity ringdown spectroscopy with a continuous-wave laser: calculation of coupling efficiency and a new spectrometer design

机译:连续波激光器的腔衰荡光谱:耦合效率的计算和新的光谱仪设计

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摘要

For the efficient operation of a cavity ringdown spectroscopy (CRDS) system utilized with a continuouswave (cw) laser, we numerically analyze the coupling efficiency of a cw laser to a ringdown cavity in terms of changes in the scanning rate, the laser linewidth, and the mirror refiectivity. We also demonstrate a new simple design for a CRDS system that can produce a CRDS signal with only a piezoelectric transducer (PZT), without the acousto-optic modulator that is usually adopted to switch off the cw laser beam that enters the cavity. Furthermore, we investigate the feasibility of the cw CRDS technique with a fast-scanning PZT by recording a CRDS spectrum of acetylene overtones. The detection sensitivity that corresponds to the noise-equivalent absorption is found to be ~3 × 10~(-9)/cm.
机译:为了有效地使用连续波(cw)激光器的腔衰荡光谱(CRDS)系统,我们从扫描速率,激光线宽和扫描速度的变化方面对cw激光器与衰荡腔的耦合效率进行了数值分析。镜子的反射率。我们还演示了一种适用于CRDS系统的新的简单设计,该系统仅使用压电换能器(PZT)即可产生CRDS信号,而无需采用通常用来关闭进入腔体的连续激光束的声光调制器。此外,我们通过记录乙炔泛音的CRDS谱图来研究具有快速扫描PZT的cw CRDS技术的可行性。相当于噪声等效吸收的检测灵敏度为〜3×10〜(-9)/ cm。

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