Divergence of High-Order Harmonic Generation by a Convex Plasma Surface
The electron density profile on a plasma surface has a decisive influence on the mechanism and characteristics of the plasma high-order harmonic generation. When the pre-pulse has a similar spatial and temporal distribution as the main laser pulse, the plasma surface on the target will expand to for...
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MDPI AG
2022-06-01
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| Series: | Applied Sciences |
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| Online Access: | https://www.mdpi.com/2076-3417/12/11/5745 |
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| author | Chun Yang Chuliang Zhou Yinghui Zheng Dongdong Zhang Jixing Gao Yafeng Bai Rong Qi Jiayi Qian Jiayan Gui Zongxin Zhang Ye Tian Zhinan Zeng |
| author_facet | Chun Yang Chuliang Zhou Yinghui Zheng Dongdong Zhang Jixing Gao Yafeng Bai Rong Qi Jiayi Qian Jiayan Gui Zongxin Zhang Ye Tian Zhinan Zeng |
| author_sort | Chun Yang |
| collection | DOAJ |
| description | The electron density profile on a plasma surface has a decisive influence on the mechanism and characteristics of the plasma high-order harmonic generation. When the pre-pulse has a similar spatial and temporal distribution as the main laser pulse, the plasma surface on the target will expand to form a convex profile of the similar size as the focal spot of the main pulse. We experimentally observed that the divergence of the harmonics generated by the relativistic laser light incident on a silica target has a saddle-shaped structure. The two-dimensional particle-in-cell simulation with convex plasma surfaces explains the experimental results very well and infers a 0.12<inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><msub><mi>λ</mi><mi>L</mi></msub></semantics></math></inline-formula> plasma scale length around the center of the convex profile. Further, we qualitatively explained that the asymmetry of the saddle-shaped harmonic divergence is caused by oblique incidence. |
| first_indexed | 2024-03-10T01:27:34Z |
| format | Article |
| id | doaj.art-3bec67ff6bfc48979ebf68896ca33244 |
| institution | Directory Open Access Journal |
| issn | 2076-3417 |
| language | English |
| last_indexed | 2024-03-10T01:27:34Z |
| publishDate | 2022-06-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Applied Sciences |
| spelling | doaj.art-3bec67ff6bfc48979ebf68896ca332442023-11-23T13:47:13ZengMDPI AGApplied Sciences2076-34172022-06-011211574510.3390/app12115745Divergence of High-Order Harmonic Generation by a Convex Plasma SurfaceChun Yang0Chuliang Zhou1Yinghui Zheng2Dongdong Zhang3Jixing Gao4Yafeng Bai5Rong Qi6Jiayi Qian7Jiayan Gui8Zongxin Zhang9Ye Tian10Zhinan Zeng11State Key Laboratory of High Field Laser Physics, Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Shanghai 201800, ChinaState Key Laboratory of High Field Laser Physics, Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Shanghai 201800, ChinaState Key Laboratory of High Field Laser Physics, Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Shanghai 201800, ChinaState Key Laboratory of High Field Laser Physics, Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Shanghai 201800, ChinaState Key Laboratory of High Field Laser Physics, Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Shanghai 201800, ChinaState Key Laboratory of High Field Laser Physics, Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Shanghai 201800, ChinaState Key Laboratory of High Field Laser Physics, Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Shanghai 201800, ChinaState Key Laboratory of High Field Laser Physics, Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Shanghai 201800, ChinaState Key Laboratory of High Field Laser Physics, Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Shanghai 201800, ChinaState Key Laboratory of High Field Laser Physics, Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Shanghai 201800, ChinaState Key Laboratory of High Field Laser Physics, Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Shanghai 201800, ChinaState Key Laboratory of High Field Laser Physics, Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Shanghai 201800, ChinaThe electron density profile on a plasma surface has a decisive influence on the mechanism and characteristics of the plasma high-order harmonic generation. When the pre-pulse has a similar spatial and temporal distribution as the main laser pulse, the plasma surface on the target will expand to form a convex profile of the similar size as the focal spot of the main pulse. We experimentally observed that the divergence of the harmonics generated by the relativistic laser light incident on a silica target has a saddle-shaped structure. The two-dimensional particle-in-cell simulation with convex plasma surfaces explains the experimental results very well and infers a 0.12<inline-formula><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><semantics><msub><mi>λ</mi><mi>L</mi></msub></semantics></math></inline-formula> plasma scale length around the center of the convex profile. Further, we qualitatively explained that the asymmetry of the saddle-shaped harmonic divergence is caused by oblique incidence.https://www.mdpi.com/2076-3417/12/11/5745laser-plasma interactionhigh-intensity laserstrong field physicshigh-order harmonic generationplasma surface |
| spellingShingle | Chun Yang Chuliang Zhou Yinghui Zheng Dongdong Zhang Jixing Gao Yafeng Bai Rong Qi Jiayi Qian Jiayan Gui Zongxin Zhang Ye Tian Zhinan Zeng Divergence of High-Order Harmonic Generation by a Convex Plasma Surface Applied Sciences laser-plasma interaction high-intensity laser strong field physics high-order harmonic generation plasma surface |
| title | Divergence of High-Order Harmonic Generation by a Convex Plasma Surface |
| title_full | Divergence of High-Order Harmonic Generation by a Convex Plasma Surface |
| title_fullStr | Divergence of High-Order Harmonic Generation by a Convex Plasma Surface |
| title_full_unstemmed | Divergence of High-Order Harmonic Generation by a Convex Plasma Surface |
| title_short | Divergence of High-Order Harmonic Generation by a Convex Plasma Surface |
| title_sort | divergence of high order harmonic generation by a convex plasma surface |
| topic | laser-plasma interaction high-intensity laser strong field physics high-order harmonic generation plasma surface |
| url | https://www.mdpi.com/2076-3417/12/11/5745 |
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