Abstract
The applicability of a KTA crystal-based laser system with optical parametric oscillators (OPO) generation to lidar sounding of the atmosphere in the spectral range 3–4 μm is studied in this work. A technique developed for lidar sounding of trace atmospheric gases (TAG) is based on differential absorption lidar (DIAL) method and differential optical absorption spectroscopy (DOAS). The DIAL-DOAS technique is tested to estimate its efficiency for lidar sounding of atmospheric trace gases. The numerical simulation performed shows that a KTA-based OPO laser is a promising source of radiation for remote DIAL-DOAS sounding of the TAGs under study along surface tropospheric paths. A possibility of using a PD38-03-PR photodiode for the DIAL gas analysis of the atmosphere is shown.
Highlights
To overlap the near- and middle IR region, radiation from optical parametric oscillators based on nonlinear crystals is used [1]
The aim of this work is the development of a technique for lidar sounding of trace atmospheric gases, which combines differential absorption lidar (DIAL) and differential optical absorption spectroscopy (DOAS), and its validation in a numerical experiment for estimating the capabilities of lidar sounding of the gas composition of the atmosphere in the 3–4 μm spectral range with an optical parametric oscillators (OPO)-based laser system
The DIAL-DOAS technique developed for trace atmospheric gases (TAG) measurements was validated for estimation of the lidar signal levels, using the specifications of the above described KTA-based OPO laser system
Summary
To overlap the near- and middle IR region, radiation from optical parametric oscillators based on nonlinear crystals is used [1]. The problem of standard DIAL measurements at only two radiation wavelengths means that the disturbing absorption is ignored. The result of this is error introduced by a priori uncertain absorption coefficient. These disadvantages do not affect differential optical absorption spectroscopy (DOAS) [2]. The aim of this work is the development of a technique for lidar sounding of trace atmospheric gases, which combines DIAL and DOAS, and its validation in a numerical experiment for estimating the capabilities of lidar sounding of the gas composition of the atmosphere in the 3–4 μm spectral range with an OPO-based laser system
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