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提出了一种新型的采用多纵模激光器作为发射光源的大气气溶胶遥感高光谱分辨率激光雷达(HSRL)技术。该技术将视场展宽迈克耳孙干涉仪(FWMI)作为光谱鉴频器,并在设计FWMI时使其周期鉴频特性与多纵模激光器的模式间隔相匹配,因而每个纵模的回波信号可被FWMI鉴频器进行效果一致的精细光谱分离。详细阐明了所提出的多纵模HSRL的原理和实现方式,定量讨论了制约多纵模HSRL中FWMI鉴频性能的主要因素。在1064nm波段采用计算机仿真验证了所提技术的性能。多纵模HSRL技术可避免目前HSRL对单纵模激光器的依赖,既能减小HSRL中激光器的成本、体积和重量,又可以大幅提升了HSRL激光系统的稳定性,对我国机载和星载HSRL的研制具有一定的借鉴意义。
A new atmospheric hyperspectral hyperspectral resolution lidar (HSRL) technology using multi-longitudinal mode laser as a light source was proposed. The technology broadens the field of view of the Michelson interferometer (FWMI) as a spectral discriminator and, in the design of the FWMI, has its periodic frequency-matching characteristics matched to the mode spacing of the multi-longitudinal mode lasers, so that the echo of each longitudinal mode The signal can be fine-tuned by the FWMI discriminator for consistent spectral separations. The principle and implementation of the proposed multi-longitudinal mode HSRL are expounded in detail. The main factors that restrict the performance of the FWMI mode discrimination in multi-longitudinal mode HSRL are discussed quantitatively. The performance of the proposed technology was verified by computer simulation in the 1064nm band. The multi-longitudinal mode HSRL technology can avoid the current dependence of HSRL on single longitudinal mode lasers, which not only reduces the cost, volume and weight of lasers in HSRL, but also greatly improves the stability of HSRL laser system. The development of HSRL has some reference value.