Open AccessMethod for wavelength stabilization of pulsed difference frequency laser at 1572 nm for CO_2 detection lidar
Author(s) -
Wei Gong,
Xin Ma,
Ge Han,
Chengzhi Xiang,
Ailin Liang,
FU Wei-dong
Publication year - 2015
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.23.006151
Subject(s) - optics , lidar , laser , wavelength , materials science , dial , calibration , absorption (acoustics) , physics , quantum mechanics , acoustics
High-accuracy on-line wavelength stabilization is required for differential absorption lidar (DIAL), which is ideal for precisely measuring atmospheric CO(2) concentration. Using a difference-frequency laser, we developed a ground-based 1.57-μm pulsed DIAL for performing atmospheric CO(2) measurements. Owing to the system complexity, lacking phase, and intensity instability, the stabilization method was divided into two parts-wavelength calibration and locking-based on saturated absorption. After obtaining the on-line laser position, accuracy verification using statistical theory and locking stabilization using a one-dimensional template matching method, namely least-squares matching (LSM), were adopted to achieve wavelength locking. The resulting system is capable of generating a stable wavelength.