【摘要】 针对平行光栅对结构的压缩器和圆形入射光束,建立了光栅拼缝所引起的光谱剪切的数学模型,并模拟了该光谱剪切对压缩脉冲信噪比的影响。与双曲正割型脉冲相比,光栅拼缝对高斯型脉冲信噪比的影响较小。随着光栅拼缝宽度的减小与光束口径的增大,压缩脉冲信噪比得到提高。对于确定的拼接光栅压缩器和光束直径,当脉冲中心波长与光谱剪切中心波长(受到光谱剪切作用的波段的中心波长)相等时,可以得到最高的压缩脉冲信噪比。更多还原

【Abstract】 The model of spectral clipping due to the tiled-grating gap of parallel grating pair compressor is established for the circular input beam,and the signal-to-noise ratio caused by the spectral clipping is simulated.Compared with sech2 pulse,the impact of tiled-grating gap on the signal-to-noise ratio of Gaussian pulse is less serious.With the tiled grating gap width decreasing and the beam diameter increasing,the signal-to-noise ratio of the compressed pulse can be improved.For a certain tiled-grating compressor and beam diameter,the highest signal-to-noise ratio is available with the central wavelength of the pulse equal to the central wavelength of the spectral clipping(the central wavelength of the wave band clipped by the tiled-grating gap).更多还原