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Influence of ac Stark shift on below-threshold harmonic generation of H 2+ molecular ions in intense laser fields
The effects of laser-induced ac Stark shift on the high-order harmonic generation below the ionization threshold of H 2 + molecular ions are investigated. The results show that several sub-peak harmonics generated in the vicinity of odd harmonics are clearly observed. Combined with the synchrosqueez...
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Published in: | Laser physics letters 2023-08, Vol.20 (8), p.85302 |
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creator | Du, Ling-Ling Wang, Zhi-Bing Jin, Fa-Cheng Wang, Guo-Li Li, Peng-Cheng |
description | The effects of laser-induced ac Stark shift on the high-order harmonic generation below the ionization threshold of H
2
+
molecular ions are investigated. The results show that several sub-peak harmonics generated in the vicinity of odd harmonics are clearly observed. Combined with the synchrosqueezing transform of the quantum time-frequency spectrum and a two-state model, we confirm that the transition between the first excited state related to ac Stark-shift and the ground state contributes to the sub-peak harmonics generation. In addition, we find some fine oscillatory structures of the sub-peak harmonic due to spectral interference. The sub-peak harmonics generation and spectral oscillations can be controlled by the laser intensity and the pulse duration. Our study provides a new alternative way to measure the energy difference of ac Stark shift between the excited state and the ground state of atoms and molecules in intense laser fields. |
doi_str_mv | 10.1088/1612-202X/ace0b3 |
format | article |
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2
+
molecular ions are investigated. The results show that several sub-peak harmonics generated in the vicinity of odd harmonics are clearly observed. Combined with the synchrosqueezing transform of the quantum time-frequency spectrum and a two-state model, we confirm that the transition between the first excited state related to ac Stark-shift and the ground state contributes to the sub-peak harmonics generation. In addition, we find some fine oscillatory structures of the sub-peak harmonic due to spectral interference. The sub-peak harmonics generation and spectral oscillations can be controlled by the laser intensity and the pulse duration. Our study provides a new alternative way to measure the energy difference of ac Stark shift between the excited state and the ground state of atoms and molecules in intense laser fields.</description><identifier>ISSN: 1612-2011</identifier><identifier>EISSN: 1612-202X</identifier><identifier>DOI: 10.1088/1612-202X/ace0b3</identifier><identifier>CODEN: LPLABC</identifier><language>eng</language><publisher>IOP Publishing</publisher><subject>ac Stark shift ; below-threshold harmonic generation ; hydrogen molecule ions</subject><ispartof>Laser physics letters, 2023-08, Vol.20 (8), p.85302</ispartof><rights>2023 Astro Ltd</rights><lds50>peer_reviewed</lds50><woscitedreferencessubscribed>false</woscitedreferencessubscribed><cites>FETCH-LOGICAL-c148t-39925d1e21d11b902a79e3947a2893493765c99adfd71ec49f98606ac902b6e23</cites></display><links><openurl>$$Topenurl_article</openurl><openurlfulltext>$$Topenurlfull_article</openurlfulltext><thumbnail>$$Tsyndetics_thumb_exl</thumbnail><link.rule.ids>314,780,784,27923,27924</link.rule.ids></links><search><creatorcontrib>Du, Ling-Ling</creatorcontrib><creatorcontrib>Wang, Zhi-Bing</creatorcontrib><creatorcontrib>Jin, Fa-Cheng</creatorcontrib><creatorcontrib>Wang, Guo-Li</creatorcontrib><creatorcontrib>Li, Peng-Cheng</creatorcontrib><title>Influence of ac Stark shift on below-threshold harmonic generation of H 2+ molecular ions in intense laser fields</title><title>Laser physics letters</title><addtitle>LPL</addtitle><addtitle>Laser Phys. Lett</addtitle><description>The effects of laser-induced ac Stark shift on the high-order harmonic generation below the ionization threshold of H
2
+
molecular ions are investigated. The results show that several sub-peak harmonics generated in the vicinity of odd harmonics are clearly observed. Combined with the synchrosqueezing transform of the quantum time-frequency spectrum and a two-state model, we confirm that the transition between the first excited state related to ac Stark-shift and the ground state contributes to the sub-peak harmonics generation. In addition, we find some fine oscillatory structures of the sub-peak harmonic due to spectral interference. The sub-peak harmonics generation and spectral oscillations can be controlled by the laser intensity and the pulse duration. Our study provides a new alternative way to measure the energy difference of ac Stark shift between the excited state and the ground state of atoms and molecules in intense laser fields.</description><subject>ac Stark shift</subject><subject>below-threshold harmonic generation</subject><subject>hydrogen molecule ions</subject><issn>1612-2011</issn><issn>1612-202X</issn><fulltext>true</fulltext><rsrctype>article</rsrctype><creationdate>2023</creationdate><recordtype>article</recordtype><recordid>eNp1kM1LAzEQxYMoWKt3j7nr2nzsV45S1BYKHlTwFrLZiZuaJjXZIv73plR6EwZmeLw3PH4IXVNyR0nbzmhNWcEIe58pDaTjJ2hylE6PN6Xn6CKlNSGcVI2YoK-lN24HXgMOBiuNX0YVP3EarBlx8LgDF76LcYiQhuB6PKi4Cd5q_AEeohpt9uTgArMbvAkO9M6piLOasPV5RvAJsFMJIjYWXJ8u0ZlRLsHV356it8eH1_miWD0_Lef3q0LTsh0LLgSregqM9pR2gjDVCOCibBRrBS8Fb-pKC6F60zcUdCmMaGtSK52tXQ2MTxE5_NUxpBTByG20GxV_JCVyj0zumcg9H3lAliO3h4gNW7kOu-hzwf_tv017bf0</recordid><startdate>20230801</startdate><enddate>20230801</enddate><creator>Du, Ling-Ling</creator><creator>Wang, Zhi-Bing</creator><creator>Jin, Fa-Cheng</creator><creator>Wang, Guo-Li</creator><creator>Li, Peng-Cheng</creator><general>IOP Publishing</general><scope>AAYXX</scope><scope>CITATION</scope></search><sort><creationdate>20230801</creationdate><title>Influence of ac Stark shift on below-threshold harmonic generation of H 2+ molecular ions in intense laser fields</title><author>Du, Ling-Ling ; Wang, Zhi-Bing ; Jin, Fa-Cheng ; Wang, Guo-Li ; Li, Peng-Cheng</author></sort><facets><frbrtype>5</frbrtype><frbrgroupid>cdi_FETCH-LOGICAL-c148t-39925d1e21d11b902a79e3947a2893493765c99adfd71ec49f98606ac902b6e23</frbrgroupid><rsrctype>articles</rsrctype><prefilter>articles</prefilter><language>eng</language><creationdate>2023</creationdate><topic>ac Stark shift</topic><topic>below-threshold harmonic generation</topic><topic>hydrogen molecule ions</topic><toplevel>peer_reviewed</toplevel><toplevel>online_resources</toplevel><creatorcontrib>Du, Ling-Ling</creatorcontrib><creatorcontrib>Wang, Zhi-Bing</creatorcontrib><creatorcontrib>Jin, Fa-Cheng</creatorcontrib><creatorcontrib>Wang, Guo-Li</creatorcontrib><creatorcontrib>Li, Peng-Cheng</creatorcontrib><collection>CrossRef</collection><jtitle>Laser physics letters</jtitle></facets><delivery><delcategory>Remote Search Resource</delcategory><fulltext>fulltext</fulltext></delivery><addata><au>Du, Ling-Ling</au><au>Wang, Zhi-Bing</au><au>Jin, Fa-Cheng</au><au>Wang, Guo-Li</au><au>Li, Peng-Cheng</au><format>journal</format><genre>article</genre><ristype>JOUR</ristype><atitle>Influence of ac Stark shift on below-threshold harmonic generation of H 2+ molecular ions in intense laser fields</atitle><jtitle>Laser physics letters</jtitle><stitle>LPL</stitle><addtitle>Laser Phys. Lett</addtitle><date>2023-08-01</date><risdate>2023</risdate><volume>20</volume><issue>8</issue><spage>85302</spage><pages>85302-</pages><issn>1612-2011</issn><eissn>1612-202X</eissn><coden>LPLABC</coden><abstract>The effects of laser-induced ac Stark shift on the high-order harmonic generation below the ionization threshold of H
2
+
molecular ions are investigated. The results show that several sub-peak harmonics generated in the vicinity of odd harmonics are clearly observed. Combined with the synchrosqueezing transform of the quantum time-frequency spectrum and a two-state model, we confirm that the transition between the first excited state related to ac Stark-shift and the ground state contributes to the sub-peak harmonics generation. In addition, we find some fine oscillatory structures of the sub-peak harmonic due to spectral interference. The sub-peak harmonics generation and spectral oscillations can be controlled by the laser intensity and the pulse duration. Our study provides a new alternative way to measure the energy difference of ac Stark shift between the excited state and the ground state of atoms and molecules in intense laser fields.</abstract><pub>IOP Publishing</pub><doi>10.1088/1612-202X/ace0b3</doi><tpages>9</tpages></addata></record> |
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source | Institute of Physics |
subjects | ac Stark shift below-threshold harmonic generation hydrogen molecule ions |
title | Influence of ac Stark shift on below-threshold harmonic generation of H 2+ molecular ions in intense laser fields |
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