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中文摘要：
文章阐述了共振介质的吸收和色散特性导致光场的位相噪声向振幅噪声转化的原理；在速度选择光泵浦的作用下，共振频率附近介质的吸收进一步增强，位相噪声向振幅噪声转化更有效，在实验上得到了铯原子D2线不受交叉吸收线影响的无多普勒吸收谱和噪声谱．噪声谱中每个“M”都对应一条跃迁能级吸收线，中心的最低点严格对应共振跃迁频率．噪声谱可以作为一种高分辨率光谱，用于研究原子的能级结构，原子的吸收和色散，尤其是可以作为一种高灵敏度的探测光场的位相噪声的方法．
英文摘要：
This paper presents an analysis of the laser phase noise to amplitude noise conversion resulted from the absorption and dispersion properties of the resonant medium theoretically;under the effect of ve- locity selective optical pumping the absorption is enhanced near the resonant frequency,and the conversion from phase to amplitude noise is more effective,so we observe the Cs atomic D2 line Doppler-free absorp- tion and noise spectrum experimentally without cross lines. Each ＇M＇ in the noise spectrum corresponds to an atomic absorption line,and the middle dip of ＇M~ shape corresponds to the resonant frequency precise- ly. Noise spectrum can be used as a kind of high resolution spectrum to research the atomic energy level structure and study the absorption and dispersion of the atom,especially it can be used as a high sensitive method to detect phase noise of the light field.
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