色散介质中啁啾高斯脉冲的时间和光谱特性

Temporal and Spectral Properties of a Chirped Gaussian Pulse in Dispersive Media

对啁啾高斯脉冲光束在色散介质中的时间和光谱特性作了研究.给出了远场光谱蓝移和脉冲展宽的解析式.结果表明:通过选择适当的啁啾参量,啁啾高斯脉冲光束沿轴上传输色散长度时,脉冲可恢复到初始值.随啁啾参量增加,谱线宽度展宽,轴上光谱蓝移增加,在远场蓝移趋于一渐近值.随啁啾参量增加,离轴光谱红移增加.

The temporal and spectral properties of a chirped Gaussian pulse in linear dispersive media are studied. The pulse broadening factor and far-field spectral blueshift are presented. It is shown that by a suitable choice of the chirp parameter C, the pulse will restore its initial form when the chirped Gaussian pulse propagates along the axis within the dispersion length. The on-axis spectral width broadens with increasing C. The axial spectral blueshift increases with increasing C and approaches an asymptotic value in the far field. The off-axis spectral redshift increases with increasing C.