Attosecond pulse walk-off in high-order harmonic generation.
Attosecond pulse walk-off in high-order harmonic generation.
复制标题
高次谐波产生中的阿秒脉冲走离。
作者：
D. Kroon;D. Guénot;M. Kotur;E. Balogh;E. Larsen;C. Heyl;M. Miranda;M. Gisselbrecht;J. Mauritsson;P. Johnsson;K. Varjú;A. L’Huillier;C. Arnold
研究了气体中高次谐波产生条件对阿秒脉冲群延迟的影响。相对于基本字段的群延迟被发现在生成单元中随着气体压力的增加而减小，反映了由于非线性介质的色散特性而导致的时间走离。利用吸收气体中高次谐波产生的轴上相位匹配模型很好地再现了这种效应。
We study the influence of the generation conditions on the group delay of attosecond pulses in high-order harmonic generation in gases. The group delay relative to the fundamental field is found to decrease with increasing gas pressure in the generation cell, reflecting a temporal walk-off due to the dispersive properties of the nonlinear medium. This effect is well reproduced using an on-axis phase-matching model of high-order harmonic generation in an absorbing gas.