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.

• 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。