【作者】 张艳； 张彬； 文侨；

【Author】 ZHANG Yan ZHANG Bin WEN Qiao (College of Electronics Information,Sichuan University,Chengdu,Sichuan 610064,China)

【机构】 四川大学电子信息学院；

【摘要】 根据平顶光束模型和部分相干光理论,推导出部分相干平顶光束的光谱传输公式,并定量研究部分相干平顶光束在自由空间传输时光谱特性的变化,详细分析了不同阶数的平顶光束在传输过程中的轴上光谱的演变规律以及光源的光谱宽度、空间相干参量等对光谱特性的影响。研究结果表明,部分相干平顶光束在自由空间传输时, 光源的光谱宽度、空间相干参量对相对谱移量影响较大,但对光谱分布随传输距离的总体变化趋势影响较小,而光谱分布随传输距离的总体变化趋势主要由平顶光束的阶数所决定。更多还原

【Abstract】 Based on the flat-topped beam model proposed by Li and the partially coherent light theory,the spectral propagating expression of the partially coherent flat-topped beam is derived,and its variation of spectral properties is studied quantitatively in the free space.The variation rule of the on-axis spectrum of the flat-topped light beam for different orders in the propagating process is analyzed in detail.The effects of the source’s spectrum width and the spatial coherence parameter on the spectral properties are discussed.It shows that when the partially coherent flat-topped beam propagates in the free space,the light source parameters have more effects on the value of the relative frequency shift than on the total change trend of the spectrum along the propagation distance,which is primarily determined by the order of flat-topped beam.更多还原