激光强度对单阶谐波增强的影响

Laser intensity effect on single-order harmonic enhancement

通过调控激光波形,理论上可以实现单阶谐波的增强.随后,当基频场强度增强时,单阶谐波增强现象消失.当控制场强度增强时,单阶谐波增强倍率增大,并且在某一特定光强下具有最大的增强值.理论分析表明,单阶谐波的增强现象不仅来源于谐波辐射的折叠区域,并且与多重谐波辐射能量峰的干涉有关.

Through the laser waveform control,the enhancement of the single-order harmonic can be achieved.Further,when the fundamental laser intensity is increased,the enhancement of the single-order harmonic is disappeared.When the controlling laser intensity is increased,the enhanced ratio of the single-order harmonic can be enhanced and a maximum enhanced value can be found at the specific laser intensity.Theoretical analyses show that the enhancement of single-order harmonic is not only dependent on the folded structure of the harmonic emission process,but also related to the interference from different harmonic emission peaks.