空气中飞秒脉冲激光器互相关信号的理论研究

利用色散脉冲传播理论和空气折射率Ciddor公式,推导了空气中飞秒脉冲激光器的互相关函数;根据互相关函数结果表达式取决于激光器光源的光谱分布,建立了在空气中不同光程路径差及环境参量变化下,不同光谱分布的飞秒脉冲激光器的脉冲之间互相关模式的数值模型.结果表明:随着传播距离的增大,互相关模型具有稳定啁啾及线性加宽;环境参量的变化只引起互相关图案的移动,并不产生任何额外线性加宽或啁啾.

Theoretical Study on Cross-correlation Signal of a Femtosecond Pulse Laser in Air

By using the dispersion pulse propagation theory and the refractive index of air Ciddor equation, the cross-correlation function of the femtosecond pulse laser was derived.According to the theory that the resulting expression of the cross-correlation function depends on the spectral distribution of the laser source, the numerical model of the cross-correlation patterns among pulses of the femtosecond pulse sequence propagating in air with different spectral distribution under different optical path difference and the change of environmental parameters was created.Results show that, the cross-correlation pattern has a stable chirp and linear broadening with the increase of propagation distance, but the change of the environmental parameters give rise to the shift of the correlations patterns without any extra linear broadening or chirp.