脉冲啁啾对高次谐波谱影响的理论研究

采用单电子近似和软核势模型 ,通过数值求解一维含时薛定谔方程的方法 ,研究了当脉冲分别带有正、负啁啾的情况下所产生的高次谐波谱的变化。结果表明 ,对于正啁啾脉冲 ,其高次谐波谱将出现分裂 ,而对于负啁啾 ,高次谐波谱呈现展宽的趋势。同时发现 ,在激光脉冲带有很大的啁啾的情况下 ,无论是正啁啾还是负啁啾 ,都会使谐波峰分裂成多个更加细小的谱峰

Theoretical Investigation of Effect of Pulse Chirp on High-order Harmonic Spectrum

Based on the single electron approximation and soft core potential model, 1D time dependent ShrAo¨Gdinger equation is solved to investigate the effect of positive and negative chirp on high order harmonic spectrum. It is shown that the harmonic spectrum generated by a positive chirped pulse splits, while that generated by a negative chirped pulse is broadened, which implies that a radiation source as short as attosecond could be produced.