为了研究介质参数对受激布里渊散射(SBS)时间相干性的影响,提出一种基于迈克耳孙干涉仪的测量及验证方法。理论上分析温度对SBS时间相干性影响的物理机制;实验上测量并分析水体温度对SBS时间相干性的影响。研究结果表明:SBS时间相干性与水体温度直接相关,随着温度的降低,SBS的时间相干性变差;温度一定时,当相干光的光程差增大到一定值后,对应的SBS相干脉冲波形不再是准高斯型。

A measurement and verification method based on Michelson interferometers is proposed for investigating the influence of medium parameters on the temporal coherence of stimulated Brillouin scattering (SBS). The physical mechanism behind the influence of temperature on the temporal coherence of SBS is presented theoretically, and the influence of water temperature on the temporal coherence of SBS is measured and analyzed experimentally. The research results indicate that the temporal coherence of SBS is directly related to water temperature. As the temperature decreases, the temporal coherence of SBS deteriorates. When the temperature is fixed but the optical path difference of coherent light increases to a certain value, the corresponding coherent pulse waveform of SBS is no longer quasi-Gaussian.