Passive laser spectrum detection technology based on static interferometer

Li, Xiao; Zhang, Jilong; Er-ming, Tian; Wang, Zhibin

doi:10.1117/12.805724

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2011

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“…High sensitivity and precision on-line concentration measurement and component analysis of ultra-low concentration trace gas are a significant subject in industry and human life in recent years. measurement methods and theory based on cavity ring-down (CRD), thin-film absorption and nonlinear laser modulation and demodulation techniques developed continuously [1][2][3]. As core technology, the measurement method using cavity ring-down spectrum and optical-cavity-enhanced absorption spectrum has proved to be able arrive at the detection limite in picomolar range [4,5].…”

Section: Introductionmentioning

confidence: 99%

Application of Difference Frequency Laser in Trace Gas Measurement System

Yang

Zhu

et al. 2011

AMR

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Based on Nd:YAG laser, tunable diode laser, electro-optic amplitude modulator and the difference frequency generator, a servo scanning laser source is designed, and the principle of trace gas concentration measurement model is introduced as well, which can realize the gas concentration measurement in the band of mid-infrared and far-infrared. Based on the theory of electromagnetic field, mutual coupling equation about laser transmission in nonlinear crystal and the optical frequency conversion characteristics are analyzed theoretically. As a result, in the range of far-field, electric field intensity of coupled wave increases approximatively exponentially,then tends to be stable.

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