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Optical Engineering

Tunable solid-state blue laser differential absorption lidar system for NO2 monitoring
Author(s): Ryoichi Toriumi; Hideo Tai; Nobuo Takeuchi
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Paper Abstract

A differential absorption lidar (DIAL) system, based on a tunable solid-state Ti:sapphire laser, was developed for nitrogen dioxide monitoring in the blue region. Efficient generation of blue light was realized by sum-frequency mixing between a Ti:sapphire laser, pumped by the second harmonic (SH) of a Nd:YAG laser, and a second Nd:YAG laser. A maximum output pulse energy of 20 mJ at 453 nm was achieved. In order to reduce the error from the change of atmospheric conditions, the laser wavelength was switched on and off resonance in every shot, and the data were averaged over 500 pulse pairs. As an example of measurement, a spatial distribution of nitrogen dioxide emission from a diesel engine was measured by this DIAL system. The detection limit achieved was 0.2 ppm, with a spatial resolution of 12 m.

Paper Details

Date Published: 1 August 1996
PDF: 5 pages
Opt. Eng. 35(8) doi: 10.1117/1.600617
Published in: Optical Engineering Volume 35, Issue 8
Show Author Affiliations
Ryoichi Toriumi, Tokyo Gas Co., Ltd. (Japan)
Hideo Tai, Tokyo Gas Co., Ltd. (Japan)
Nobuo Takeuchi, Chiba Univ. (Japan)

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