| 摘要: |
| 采用非微扰形式散射理论研究了椭圆偏振的强激光场中高次谐波的生成过程.把椭圆偏振激光场处理为左旋和右旋圆偏振激光的叠加，讨论了谐波生成过程中的角动量转化问题.研究发现，强激光场中高次谐波生成(HHG)的许多基本特征，都是角动量守恒的体现.用相位Bessel函数描述多光子跃迁过程,得到了谐波产生的几率幅公式，还展示了高次谐波产率随椭圆偏振度的变化. |
| 关键词: 高次谐波生成(HHG) 角动量转化和守恒 强激光物理 |
| DOI：10.3969/J.ISSN.1000-5137.2023.05.002 |
| 分类号:O 186.5 |
| 基金项目:The National Natural Science Foundation of China (11674231, 12074261); Shanghai Natural Science Foundation (20ZR1441600) |
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| High-order harmonics generation in elliptically polarized driving fields：a perspective from angular momentum transfer |
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SHEN Ying, ZHANG Jingtao
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Mathematics and Science College, Shanghai Normal University, Shanghai 200234, China
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| Abstract: |
| Using a nonperturbative scattering theory, we study the high-order harmonics generated from atoms driven by elliptically polarized (EP) intense laser fields. We treat the EP fields as a composition of counter rotating circularly polarized (CP) laser modes, and focus on the angular momentum transfer during HHG. We find that many known features of high-order harmonics generation (HHG) are connected with the angular momentum conservation. |
| Key words: high-order harmonics generation (HHG) angular momentum transfer and conser-vation intense laser physics |
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