以OPO激光器为光源, 设计了一台激发波长在192~2 750 nm范围内连续可调谐的激光雷达系统.分光系统由可旋转光栅和小孔光阑构成, 通过调节光栅的衍射角, 实现不同波长回波信号的有效接收.光电倍增管用于紫外和可见光波段回波信号的光电转换, InGaAs探测器用于红外波段回波信号的光电转换.后续数据采集及处理由专用采集系统和PC机完成.利用美国标准大气模型对系统在不同波段的探测能力进行数值仿真, 验证了系统的可行性.该系统实现了激光雷达激发波长的大范围扩展, 对精细反演近地表气溶胶微物理特性具有重要的研究意义.

A wavelength tunable lidar is designed based on OPO laser. The output wavelength of the lidar can be tunable continuously in the range of 192~2750 nm. The optical splitting system of the lidar is composed of rotatable gratings and circular apertures. By adjusting the diffraction angle of the rotatable gratings, the lidar can receive the return signal at the specific wavelength. The photomultiplier tube and InGaAs detectors are used to transform the optical signal into electric signal in the corresponding wavebands. Subsequent data acquisition and processing are performed by data acquisition system and PC. Numerical simulations are performed with the standard atmospheric model. The detection ability of the lidar in the different wavebands is verified by the simulation results. The lidar is of important significance for fine detection of microphysical properties of near-surface aerosols.