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Birefrmgent laterally sheared Beam splitter - savart polariscope

Birefrmgent laterally Sheared Beam Splitter - Savart polaris...

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2nd International symposium on Advanced Optical Manufacturing and Testing Technologies

作者： Chunmin Zhang Baochang Zhao Bin xiangli Yingcai Li Zhihong Peng shool of science xi’an Jiaotong University xi’an 710049 people’s republic of china xi’an institute of optics and precision mechanics Chinese Academy of sciences xi’an 710068 people’s republic of china

＜正＞A laterally sheared beam splitter-savart polariscope was developed based on a single birefringent component. It is a key part in a novel polarization interference imaging spectrometer. The savart polariscope consists of two paralled plales of calcite cut at an arbitrary angle to the optics axis and can split up a ray of light incident on the surface into an ordinary ray and an extraordinary ray. The output rays are paralled laterally sheared. The savart polariscope is 25×25×12mm3 in size. The lateral displacement is 1mm and transmissivity is about 90 percent in spectral range of 0.4-2.5μm A static polarization imaging spectrometer based on a savart polariscope has advantage of ultra-compact size, wide field of view, high throughput and without any moving parts. The principle and construction of savart polariscope arc described, and the experimental results of the interference imaging spectrum are given.

关键词： Birefringent crystal savart polariscope Polarization interference imaging spectrometer

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Effect of surface roughness on the measurement of high power laser with a cone-shaped cavity

Effect of surface roughness on the measurement of high power...

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2nd International symposium on Advanced Optical Manufacturing and Testing Technologies

作者： WANG Lei YANG Zhaojin LI Gaoping LIANG Yanxi (xi’an institute of Applied optics Optic Metrology station xi’an shanxi people’s republic of china 710065)

＜正＞Cone-shaped cavity is an effective method for measuring energy of high energy laser, where the effect absorption coefficient of the cavity is often thought to be equal to 1. But in actual, because of the limitation of surface roughness, backscatter laser will happen in the cavity, which will influence the effective absorption coefficient. The paper reported here discusses this question in detail. According to the reflection rule, which is deeply relied on the surface roughness, the distribution function of backscatter laser power density is deduced in the paper. Numerical calculation method is used to analyze the expression of backscatter laser profile and calculate the total backscatter laser energy loss. Ring shaped backscatter energy meter is designed to inspect the backscatter energy lose of a cone-shaped high energy meter and to prove the theory calculation results. Experiment result shows that backscatter laser energy is indeed a significant error source in high energy laser measurement, and by adding the backscatter energy loss into the main measurement result, the precision of high energy laser energy measurement will greatly be enhanced.

关键词： high energy laser absolute energy meter backscatter

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