部分相干光与相干光在湍流中的传输特性实验研究

相干光经湍流传输引起光强闪烁效应,理论研究表明利用部分相干光可降低该影响,而相关的实验验证鲜有报道。利用水介质的对流湍流池模拟产生了Rytov方差为0.04~0.16的湍流,进行了弱起伏区湍流中部分相干光及相干光的传输实验,由接收光强计算出其光强闪烁指数随湍流Rytov方差的变化关系。实验结果表明:随着湍流强度的增加,部分相干光与相干光的闪烁效应均增强,但部分相干光的闪烁指数小于相干光。将实验数据与Andrews等人建立的闪烁指数理论模型进行比较,得出了较为一致的结论。

Experiment of partially coherent and coherent light propagating through a turbulence emulator

The transmission performance will be affected by scintillation while the coherent light is propagating through turbulence in atmosphere. Theoretical research shows that the effect can be deduced by using partially coherent light. However, there is few related experimental verification up to now. In this work, turbulence with Rytov variance of 0.04~0.16 was generated by a turbulence emulator of aqueous medium. Transmission experiment of partially coherent light and coherent light in weak turbulence was conducted. Scintillation index was obtained as a function of Rytov variance by analyzing the received intensity. The analysis shows that the scintillation indexes of partially coherent light and coherent light increase with the increase of strength of turbulence, however, the scintillation index of coherent light is larger than that of partially coherent light, which is consistent with the theoretical model of Gaussian Schell beam established by Andrews et al.