基于半导体激光器的780 nm高光谱分辨率激光雷达系统设计

Design of 780-nm High Spectral Resolution Lidar Based on Laser Diode

设计了一种基于半导体激光器的780nm高光谱分辨率激光雷达。发射系统以分布反馈式半导体激光器为种子源,利用脉冲电流驱动的锥形半导体光放大器实现窄线宽微脉冲激光输出。分光系统由干涉滤光片、法布里-珀罗标准具和铷原子吸收池构成。干涉滤光片带宽为0.5nm,法布里-珀罗标准具的半峰全宽为2.8GHz,二者串联可有效剔除太阳背景光。温度为338K的铷原子吸收池对米氏散射信号的抑制比达33dB,可有效提取瑞利散射信号。基于美国标准大气模型对系统进行了数值仿真,验证了系统的探测能力。研究结果对气溶胶光学参量的探测研究具有重要意义。

A 780-nm high spectral resolution lidar was designed herein based on a laser diode.A distributed feedback semiconductor laser was used as the seed of the light source system.A tapered semiconductor optical amplifier driven by pulse current was used to output the narrow line width pulse laser.The optical splitting system mainly comprised a narrow-band interference filter,a Fabry-Perot etalon,and a 87Rb absorption cell.The bandwidth of the narrow-band interference filter was 0.5nm.The full width at half maximum of the Fabry-Perot etalon was 2.8 GHz.Solar background light was filtered by their combination.The Mie scattering signal was absorbed by the 87Rb cell at the temperature of 338K,which had an inhibition rate of up to 33dB.The Rayleigh scattering signal was then effectively extracted.Based on the American standard atmospheric model,the detection capability of the high spectral resolution lidar was verified via numerical simulations.This research was highly significant to the detection of aerosol optical parameters.