{"title":"Generation of High-Order Harmonics by Gallium Ions in Intense Laser Pulse","authors":"A. I. Magunov, V. V. Strelkov, S. N. Yudin","doi":"10.3103/S1541308X23060079","DOIUrl":null,"url":null,"abstract":"<p>The spectrum of high-order harmonics generated in interaction of an intense femtosecond laser pulse with a singly charged gallium ion is theoretically investigated. The results of the calculations reveal enhancement of odd harmonics that are in resonance with the frequency of the transition from the ground state to the odd autoionizing state 3d<sup>9</sup>4s<sup>2</sup>4p <sup>1</sup>P<sub>1</sub> and harmonics that correspond to the multiphoton resonance with the even autoionizing states 3d<sup>10</sup>4p5p <sup>1</sup>S<sub>0</sub> and <sup>1</sup>D<sub>2</sub> (dark states) and are one laser frequency away from them. The effect of resonant enhancement of harmonics was earlier observed in experiments on gallium targets with a plasma plume.</p>","PeriodicalId":732,"journal":{"name":"Physics of Wave Phenomena","volume":"31 6","pages":"418 - 426"},"PeriodicalIF":1.1000,"publicationDate":"2023-12-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"0","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Physics of Wave Phenomena","FirstCategoryId":"101","ListUrlMain":"https://link.springer.com/article/10.3103/S1541308X23060079","RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q3","JCRName":"PHYSICS, MULTIDISCIPLINARY","Score":null,"Total":0}
引用次数: 0
Abstract
The spectrum of high-order harmonics generated in interaction of an intense femtosecond laser pulse with a singly charged gallium ion is theoretically investigated. The results of the calculations reveal enhancement of odd harmonics that are in resonance with the frequency of the transition from the ground state to the odd autoionizing state 3d94s24p 1P1 and harmonics that correspond to the multiphoton resonance with the even autoionizing states 3d104p5p 1S0 and 1D2 (dark states) and are one laser frequency away from them. The effect of resonant enhancement of harmonics was earlier observed in experiments on gallium targets with a plasma plume.
期刊介绍：
Physics of Wave Phenomena publishes original contributions in general and nonlinear wave theory, original experimental results in optics, acoustics and radiophysics. The fields of physics represented in this journal include nonlinear optics, acoustics, and radiophysics; nonlinear effects of any nature including nonlinear dynamics and chaos; phase transitions including light- and sound-induced; laser physics; optical and other spectroscopies; new instruments, methods, and measurements of wave and oscillatory processes; remote sensing of waves in natural media; wave interactions in biophysics, econophysics and other cross-disciplinary areas.
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