多纵模高光谱分辨率激光雷达研究

发布时间：2018-02-28 16:49

本文关键词： 大气光学激光雷达高光谱分辨率多纵模激光器大气气溶胶探测　出处：《光学学报》2017年04期 　论文类型：期刊论文

【摘要】：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。
[Abstract]:A novel atmospheric aerosol remote sensing hyperspectral resolution lidar (HSRL) technique using multi-longitudinal-mode lasers as the emitting source is proposed, in which the extended field of view (FWMI) is used as the spectral frequency discriminator. In the design of FWMI, the characteristic of periodic frequency discrimination is matched with the mode interval of multi-longitudinal-mode laser. Therefore, the echo signal of each longitudinal mode can be separated by the FWMI discriminator with the same effect of fine spectrum. The principle and implementation of the proposed multi-longitudinal mode HSRL are described in detail. The main factors that restrict the performance of FWMI frequency discrimination in multi-longitudinal mode HSRL are discussed quantitatively. The performance of the proposed technique is verified by computer simulation at 1064nm. Multi-longitudinal-mode HSRL technology can avoid the dependence of HSRL on single-longitudinal-mode lasers. It can not only reduce the cost, volume and weight of laser in HSRL, but also greatly improve the stability of HSRL laser system. It can be used for reference in the development of airborne and spaceborne HSRL in China.
【作者单位】：浙江大学光电科学与工程学院现代光学仪器国家重点实验室;
【基金】：国家重点研发计划(2016YFC0200704) 国家自然科学基金(41305014,61475141) 浙江省公益技术研究项目(2016C33004) 现代光学仪器国家重点实验室创新基金(MOI2015QN01)
【分类号】：TN958.98

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