Microchip Laser Feedback Interferometer with an Optical Path Multiplier  

作　　者：任舟 谈宜东 万新军 李铎 张书练 

机构地区：[1]State Key Laboratory of Precision Measurements, Department of Precision Instruments, Tsinghua University, Beijing 100084

出　　处：《Chinese Physics Letters》2008年第11期3995-3998,共4页中国物理快报（英文版）

摘　　要：We present a microchip laser feedback interferometer with an optical path multiplier to enhance the resolution of traditional laser feedback interferometers （LFI）. The optical path multiplier has a unique device, i.e. diffusive reflector. As class B microchip lasers have extremely high sensitivity to laser feedback, the diffusive reflector can easily reflect or diffuse back the laser beam without much manual adjustment to the optical system, which ensures the system＇s easy-adjustment and practical feature. The optical path multiplier is a two-mirror system which enables the laser beam to reflect between the two mirrors by N times. When the target shifts a distance of Ad, the variation of the optical path will be about （4N ×△d）. Thus the system＇s resolution is about 4N times as high as the traditional LFI. Under typical room conditions, the optical path multiplier can effectively enhance the system＇s resolution by more than 26 times as high as a traditional LFI system and even to the level of 0.1 nm.We present a microchip laser feedback interferometer with an optical path multiplier to enhance the resolution of traditional laser feedback interferometers （LFI）. The optical path multiplier has a unique device, i.e. diffusive reflector. As class B microchip lasers have extremely high sensitivity to laser feedback, the diffusive reflector can easily reflect or diffuse back the laser beam without much manual adjustment to the optical system, which ensures the system＇s easy-adjustment and practical feature. The optical path multiplier is a two-mirror system which enables the laser beam to reflect between the two mirrors by N times. When the target shifts a distance of Ad, the variation of the optical path will be about （4N ×△d）. Thus the system＇s resolution is about 4N times as high as the traditional LFI. Under typical room conditions, the optical path multiplier can effectively enhance the system＇s resolution by more than 26 times as high as a traditional LFI system and even to the level of 0.1 nm.

关 键 词：the power-law exponents precipitation durative abrupt precipitation change 

分 类 号：TN24[电子电信—物理电子学]