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针对多普勒激光雷达激光源短期频率漂移低于1 MHz的要求,设计了一种共焦干涉仪作为频率标准进行稳频。通过对三种不同材料制成的共焦法布里-珀罗(Fabry-Perot)干涉仪中心频率随温度漂移情况进行分析对比,选用零膨胀微晶玻璃材料制作共焦法布里-珀罗干涉仪,腔镜和隔离器通过光胶的方式进行组合,并且置于温控精度优于0.01 K的双层密封温控箱中。经过实验测量,共焦法布里-珀罗干涉仪的自由光谱范围为370 MHz,透射谱半峰全宽(FWHM)为1.7 MHz,精细度为220。采用该共焦干涉仪进行稳频,理论稳频精度可达0.15 MHz,满足激光多普勒雷达单频激光源的稳频要求。
Aiming at the requirement that the short-term frequency drift of Doppler lidar laser source is lower than 1 MHz, a confocal interferometer is designed as the frequency standard for frequency stabilization. By comparing and analyzing the center frequency of the confocal Fabry-Perot interferometer with the temperature drift made of three different materials, the zero-expansion glass-ceramic material is used to make a confocal Fabry-Perot Interferometers, mirrors and spacers are combined by glue and placed in a double-sealed, temperature-controlled tank with temperature control accuracies of better than 0.01 K. After experimental measurements, the confocal Fabry-Perot interferometer has a free spectral range of 370 MHz, a full width at half maximum (FWHM) of transmission spectrum of 1.7 MHz and a fineness of 220. Using this confocal interferometer for frequency stabilization, the theoretical frequency stabilization accuracy can reach 0.15 MHz, which meets the frequency stabilization requirements of single-frequency laser source of laser Doppler radar.