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首页> 外文期刊>Plasma and Fusion Research >Development of a Bright Polychromator for Thomson Scattering Measurements
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Development of a Bright Polychromator for Thomson Scattering Measurements

机译：开发用于汤姆森散射测量的明亮多色仪

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A bright polychromator for compact, efficient YAG Thomson scattering measurement was designed on the basis of ray-tracing calculations. The optical input of the polychromator is a 2-mm-diameter optical fiber with a numerical aperture of 0.37. High refractive index glass lenses with monolayer anti-reflection coatings were used to reduce aberration effects and achieve good efficiency. A fast, low-noise detection system consisting of an avalanche photodiode and operational amplifiers was designed and tested using YAG laser pulses; the measured full width at half maximum (FWHM) of the laser pulse was 10 ns. The measured noise was dominated by the thermal noise of the input resistance R (= 470 Ω) when the signal was low, and the shot noise became dominant when the number of detected photons was greater than about 500.
机译：基于光线跟踪计算，设计了一种用于紧凑，高效YAG汤姆森散射测量的明亮多色仪。多色仪的光学输入是直径为2毫米的光纤，其数值孔径为0.37。使用具有单层抗反射涂层的高折射率玻璃透镜可减少像差效果并获得良好的效率。使用YAG激光脉冲设计并测试了由雪崩光电二极管和运算放大器组成的快速，低噪声检测系统;测得的激光脉冲半峰全宽（FWHM）为10 ns。信号低时，测得的噪声受输入电阻R（= 470Ω）的热噪声支配，而当检测到的光子数量大于约500时，散粒噪声占主导地位。

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