Application of stimulated rotational Raman scattering technique in NO2-DIAL system

Dawei Fang; Ben Xu; Kai Yang; Chenxia Li

doi:10.1117/12.867772

22 October 2010 Application of stimulated rotational Raman scattering technique in NO₂-DIAL system

Dawei Fang, Ben Xu, Kai Yang, Chenxia Li

Proceedings Volume 7658, 5th International Symposium on Advanced Optical Manufacturing and Testing Technologies: Optoelectronic Materials and Devices for Detector, Imager, Display, and Energy Conversion Technology; 76585L (2010) https://doi.org/10.1117/12.867772
Event: 5th International Symposium on Advanced Optical Manufacturing and Testing Technologies, 2010, Dalian, China

Abstract

Differential Absorption Lidar (DIAL) for detecting atmospheric pollution is used extensively for its high precision and spatial resolution. The selection of the suitable absorption wavelength and the stimulation and modulation of the corresponding laser source are of key importance for DIAL system. This literature presents first a new approach for attaining the specific absorption wavelength in design of the new type NO₂-DIAL. The third harmonic of Nd:YAG laser itself is taken as the selected λ_on (354.7 nm), and is converted to the circularly or elliptically polarized laser to pump the D₂ Raman cell, acquiring plentiful frequency spectrum of stimulated vibrational and rotational Raman scattering light, among which the first-order pure stimulated rotational Raman scattering light nearest to the pumping laser wavelength is taken as the λ_off (359.9 nm) for DIAL. The polarization state of the pumping laser can be conveniently modulated by using a λ/4 wave-plate. It is of large advantages in raising the technical performance and the economical efficiency. The technique will be very useful for DIAL to detect other constituents of atmospheric pollution.

Citation Download Citation

Dawei Fang, Ben Xu, Kai Yang, and Chenxia Li "Application of stimulated rotational Raman scattering technique in NO₂-DIAL system", Proc. SPIE 7658, 5th International Symposium on Advanced Optical Manufacturing and Testing Technologies: Optoelectronic Materials and Devices for Detector, Imager, Display, and Energy Conversion Technology, 76585L (22 October 2010); https://doi.org/10.1117/12.867772

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KEYWORDS

Raman scattering

Absorption

Light scattering

Raman spectroscopy

Laser scattering

Polarization

NOx

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