Sensitive intracavity photoacoustic spectrometer based on CO2 waveguide laser

Shaocheng Li; Qingxu Yu; Zhibin Chen; Junxiu Lin

doi:10.1117/12.401777

5 October 2000 Sensitive intracavity photoacoustic spectrometer based on CO₂ waveguide laser

Shaocheng Li, Qingxu Yu, Zhibin Chen, Junxiu Lin

Proceedings Volume 4223, Instruments for Optics and Optoelectronic Inspection and Control; (2000) https://doi.org/10.1117/12.401777
Event: Optics and Optoelectronic Inspection and Control: Techniques, Applications, and Instruments, 2000, Beijing, China

Abstract

Photoacoustic spectroscopy (PAS) is a promising spectroscopic technology due to its intrinsically high sensitivity, large dynamic range and comparatively simple experimental arrangement. In this paper a photoacoustic interactive configuration is presented. The system consists of three main parts: CO₂ waveguide laser, a photoacoustic cell and electronic measurement system. The resonant photoacoustic cell excited in its first longitudinal mode is placed inside the optical cavity of the CO₂ waveguide laser. Due to the high intracavity power the photoacoustic signal is enhanced almost tow orders of magnitude compared with the extracavity configuration. The optimum system design was found by numerical simulation of the acoustic properties of various cell geometries. An open- resonator model is developed and analyzed in detail. The characteristics of the system we have predicted using the theory match the experimental results very well. Many methods such as adding iris before the spectrometer, adjusting the position of chopper are used to modify the configuration of the system, which proved to be helpful to get better quality. A computer program based on spectroscopic tack technique system improves the long-term stability and measurement accuracy. Finally this PAS system is applied to various trace gas analysis of plant successfully and a detection sensitivity of ppt level for C2H4 is reached.

Citation Download Citation

Shaocheng Li, Qingxu Yu, Zhibin Chen, and Junxiu Lin "Sensitive intracavity photoacoustic spectrometer based on CO₂ waveguide laser", Proc. SPIE 4223, Instruments for Optics and Optoelectronic Inspection and Control, (5 October 2000); https://doi.org/10.1117/12.401777

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