部分空间和部分光谱相干高斯-谢尔模型脉冲光束在自由空间中的光谱和时间特性
Spectral and temporal properties of spatially and spectrally partially coherent Gaussian Schell-model pulsed beams in free space
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摘要: 对部分空间和部分光谱相干２维高斯-谢尔模型脉冲光束在自由空间传输的光谱和时间特性做了详细的数值研究。结果表明，部分空间和部分光谱相干高斯-谢尔模型脉冲光束在自由空间传输中发生了光谱移动，光谱移动与场点位置、空间相关长度和时间相干长度有关。在轴上，光谱出现蓝移，相对光谱移动随传输距离的增加而增大，随空间相关长度和时间相干长度的增加而减小，并逐渐趋于一定值。在轴外，光谱出现蓝移和红移，并与空间相关长度和时间相干长度有关。脉冲时间波形不变，对所得主要结果做了物理解释。Abstract: The spectral and temporal properties of two-dimensional spatially and spectrally partially coherent Gaussian Schell-model pulsed(GSMP) beams propagating in free space are studied and analyzed numerically. It is shown that the spectral shift takes place, which depends on the position of the field point, spatial correlation length and the temporal coherence length, as GSMP beams propagate in free space. The on-axis spectrum is blue-shifted, and the relative spectral shift increases with increasing propagation distance, and decreases as the spatial correlation length and temporal coherence length increase, and then approaches an asymptotic value. The off-axis spectrum is blue-shifted or red-shifted, depending on the spatial correlation length and temporal coherence length. The temporal intens
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