超短脉冲椭圆高斯光束的自由传输

Free Propagation of Ultra-short Pulsed Elliptical Gaussian Beams

基于傅里叶变换的方法,得到了超短脉冲椭圆高斯光束在自由空间中的解析表达式.并通过例子研究了超短脉冲椭圆高斯光束的传输性质.结果表明:在传输过程中,由于横向衍射效应和时空耦合效应,导致了光束边沿的脉冲延迟、椭圆长短轴的交换,及脉冲不同位置处的图样差异等效应.

The analytical solution of ultra-short pulsed elliptical Gaussian beams in free space is obtained based on the Fourier transform technique. The propagation properties of uhra-short pulsed elliptical Gaussian beams are investigated in detail through an example. The example shows that, in propagation, the diffraction and the spatiotemporal coupling yield some effects, such as the pulse delay at the beam periphery, the exchange between the major axis and the minor axis of the elliptical pattern, and the pattern difference at different pulse location.