高斯-谢尔模型列阵光束的远场发散角和远场辐射强度

The far-field divergence angle and the far-field radiant intensity distribution of Gaussian Schell-model array beams

推导出了高斯-谢尔模型(GSM)列阵光束通过自由空间传输其二阶矩束宽、远场发散角和远场辐射强度的解析表达式,并给出了GSM列阵光束与高斯光束具有相同远场发散角的条件.研究表明,具有相同远场发散角的GSM列阵光束与对应的高斯光束并不具有相同的远场辐射强度分布,这一特性与单束GSM光束的差异很大.

The analytical expressions for the mean-squared beam width, the far-field divergence angle and the far-field radiant intensity of Gaussian Schell-model （GSM） array beams are derived, and the condition under which GSM array beams have the same farfield divergence angle as a single Gaussian beam. It is shown that GSM array beams and a Gaussian beam which have the same far-field divergence angle may have different far-field radiant intensity distribution, which is quite different from the behavior of GSM beams.