湍流大气中J0相关部分相干平顶光束的传输特性

为了研究相干度为零阶贝塞耳函数的部分相干平顶光束的传输特性,采用广义惠更斯-菲涅耳公式得到了J0相关部分相干平顶光束通过湍流大气的平均光强分布,并利用空间2阶矩法得到了均方根束宽的解析表达式;分析了传输距离、相干长度、大气折射率结构常数、阶数对光强分布特性和光束扩展的影响。结果表明,J0部分相干平顶光束的阶数越高,相干长度越小,光束受湍流的影响就越小;改变光源的相干度可以使光束在湍流大气中的中心光强达到最大。

Propagation properties of J0-correlated partially coherent flat-topped beams in a turbulent atmosphere

In order to study propagation properties of J0-correlated partially coherent flat-topped beams in atmospheric turbulence,the average intensity distribution were derived based on extended Huygens-Fresnel principle,and the analytical expression of beams waist width was obtained with the second-order moment method.Then,the effects of propagation distance,correlation lengths of source,structure constant and orders of flat-topped beams on average intensity distribution and beam width were analyzed.It was show that higher order flat-topped beam was less affected by atmospheric turbulence and it was less broadened.Results also show that maximum central intensity value can be obtained by adjusting the correlation lengths of source.