双色激光脉冲相位差对晶体发射高次谐波 的影响

通过数值求解双色激光场(基频场和二倍频场)与一维晶体相互作用的含时薛定谔方程,研究了晶体在双色激光脉冲驱动下发射高次谐波的特点.研究结果表明,晶体在双色激光脉冲驱动下发射的高次谐波第二平台强度相对于单色激光脉冲驱动下有显著提高,且随双色激光脉冲的相位差明显变化.进一步的研究发现,在双色激光脉冲其它参数保持不变的情况下,通过调节双色激光脉冲的相位差就能有效提高晶体发射高次谐波第二平台的产额,提高的幅度会随激光脉冲的宽度有所不同.

Phase difference effect on high-order harmonic generation of crystals driven by two-color laser pulses

We investigate the characteristics of the high-order harmonics generation(HHG) emitted from one-dimension crystals driven by the two-color combined field pulse based on the numerical solution of the time-dependent Schrödinger equation of the crystal in the two-color laser fields (fundamental frequency field and double frequency field). We find that the strength of the second plateau of HHG is significantly enhanced, and changed with the phase difference of the double-color fields. Furthermore, when the other parameters of the two-color laser pulse remain unchanged, the HHG yield of crystals in the second plateau can be enhanced effectively by adjusting the phase difference of the two-color laser pulse, and the enhancement of HHG yield vary with the width of the laser pulses.