载波相位对超短脉冲谐波谱的影响  

Effect of the carrier phase of ultra-short laser pulses on high-order harmonic generation spectra

作　　者：陈基根[1] 陈高[2] 曾思良[3] 杨玉军[4] 朱颀人[4] 

机构地区：[1]台州学院物理系,椒江318000 [2]长春理工大学理学院,长春130022 [3]北京应用物理与计算数学研究所,北京100088 [4]吉林大学原子与分子物理研究所,长春130012

出　　处：《物理学报》2008年第7期4104-4109,共6页Acta Physica Sinica

基　　金：国家自然科学基金(批准号:10474028,10604021)资助的课题~~

摘　　要：数值计算了线偏振的超短激光脉冲(脉冲持续时间为两个光学周期)与一维模型原子相互作用产生的高次谐波发射功率谱.研究表明,当载波相位发生变化时,超短脉冲谐波谱的截止频率也随之改变,而且在特定相位下,谐波谱出现了明显的双平台结构.对此,采用半经典的"三步"模型给出了合理解释,并利用小波时频分析方法证实"三步"模型可以准确预言超短脉冲谐波谱的截止频率.We numerically calculated the high-order harmonic generation （HHG） power spectra from a one-dimensional model atom irradiated by linearly polarized ultra-short laser pulses whose duration is two optical cycles. It was found that, the cut-off positions of the HHG spectra change when the carrier phases of the ultra-short laser pulses are altered, and the distinct double plateau structure appears in some special carrier phases. The above issues are reasonably explaned by the three-step model. Finally, the wavelet time-frequency analysis verifies that the three-step model can accurately exactly predict the cut-off frequencies of the ultra-short pulse HHG spectra.

关 键 词：高次谐波 超短脉冲 载波相位 

分 类 号：TN24[电子电信—物理电子学]