Hoffman David S, Repasky Kevin S, Reagan John A, Carlsten John L
Electrical and Computer Engineering, 610 Cobleigh Hall, Montana State University, Bozeman, Montana 59717, USA.
Appl Opt. 2012 Sep 1;51(25):6233-44. doi: 10.1364/AO.51.006233.
The high spectral resolution lidar (HSRL) instrument described in this paper utilizes the fundamental and second-harmonic output from an injection seeded Nd:YAG laser as the laser transmitter. The light scattered in the atmosphere is collected using a commercial Schmidt-Cassegrain telescope with the optical receiver train first splitting the fundamental and second-harmonic return signal with the fundament light monitored using an avalanche photodiode. The second-harmonic return signal is mode matched into a tunable confocal Fabry-Perot (CFP) interferometer with a free spectral range of 7.5 GHz and a finesse of 50.7 (312) at 532 nm (1064 nm) placed in the optical receiver for spectrally filtering the molecular and aerosol return signals. The light transmitted through the CFP is used to monitor the aerosol return signal while the light reflected from the CFP is used to monitor the molecular return signal. Data collected with the HSRL are presented and inversion results are compared to a co-located solar radiometer, demonstrating the successful operation of the instrument. The CFP-based filtering technique successfully employed by this HSRL instrument is easily portable to other arbitrary wavelengths, thus allowing for the future development of multiwavelength HSRL instruments.
本文所述的高光谱分辨率激光雷达（HSRL）仪器利用注入种子Nd:YAG激光器的基频和二次谐波输出作为激光发射器。利用商用施密特-卡塞格伦望远镜收集大气中散射的光，光学接收系统首先将基频和二次谐波返回信号分离，基频光由雪崩光电二极管监测。二次谐波返回信号被模式匹配到一个可调谐共焦法布里-珀罗（CFP）干涉仪中，该干涉仪在532纳米（1064纳米）处的自由光谱范围为7.5吉赫兹，精细度为50.7（312），放置在光学接收器中用于对分子和气溶胶返回信号进行光谱滤波。透过CFP的光用于监测气溶胶返回信号，而从CFP反射的光用于监测分子返回信号。展示了用HSRL收集的数据，并将反演结果与共置的太阳辐射计进行了比较，证明了该仪器的成功运行。该HSRL仪器成功采用的基于CFP的滤波技术很容易移植到其他任意波长，从而为多波长HSRL仪器的未来发展提供了可能。
