有限孔径法消除布里渊光谱中的展宽
Eliminating the broadening by finite aperture in Brillouin spectroscopy
摘要：
提出了一种新的光学装置，它可以避免布里渊光谱中有限孔径的展宽。在该系统中，由整个散射体积以相同角度散射的所有射线被收集在区域检测器的单个像素上。这允许使用大的收集角，增加光度而不降低频移和线宽测量的精度。提供了几个实验检查的结果，显示该设备的效率。
英文摘要：
We present a new optical arrangement which allows to avoid the broadening by finite aperture in Brillouin spectroscopy. In this system, all the rays scattered at the same angle by the whole scattering volume are collected on a single pixel of the area detector. This allows to use large collection angles, increasing the luminosity without lowering the accuracy of the frequency-shift and linewidth measurements. Several results of experimental checks are provided, showing the efficiency of the device.
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