Nehrir Amin R, Repasky Kevin S, Carlsten John L
Montana State University, Electrical and Computer Engineering Department, Bozeman, Montana 59715, USA.
Opt Express. 2012 Oct 22;20(22):25137-51. doi: 10.1364/OE.20.025137.
An all diode-laser-based micropulse differential absorption lidar (DIAL) laser transmitter for tropospheric water vapor and aerosol profiling is presented. The micropulse DIAL (MPD) transmitter utilizes two continuous wave (cw) external cavity diode lasers (ECDL) to seed an actively pulsed, overdriven tapered semiconductor optical amplifier (TSOA). The MPD laser produces up to 7 watts of peak power over a 1 µs pulse duration (7 µJ) and a 10 kHz pulse repetition frequency. Spectral switching between the online and offline seed lasers is achieved on a 1Hz basis using a fiber optic switch to allow for more accurate sampling of the atmospheric volume between the online and offline laser shots. The high laser spectral purity of greater than 0.9996 coupled with the broad tunability of the laser transmitter will allow for accurate measurements of tropospheric water vapor in a wide range of geographic locations under varying atmospheric conditions. This paper describes the design and performance characteristics of a third generation MPD laser transmitter with enhanced laser performance over the previous generation DIAL system.
本文介绍了一种基于全二极管激光器的微脉冲差分吸收激光雷达（DIAL）激光发射器，用于对流层水汽和气溶胶剖面探测。微脉冲DIAL（MPD）发射器利用两台连续波（cw）外腔二极管激光器（ECDL）来泵浦一个主动脉冲、过驱动的锥形半导体光放大器（TSOA）。MPD激光器在1微秒脉冲持续时间（7微焦）和10千赫脉冲重复频率下产生高达7瓦的峰值功率。使用光纤开关以1赫兹的频率实现在线和离线种子激光器之间的光谱切换，以便在在线和离线激光脉冲之间更准确地采样大气体积。大于0.9996的高激光光谱纯度与激光发射器的宽可调谐性相结合，将允许在不同大气条件下的广泛地理位置准确测量对流层水汽。本文描述了第三代MPD激光发射器的设计和性能特征，其激光性能比上一代DIAL系统有所增强。
