Control of coherent extreme-ultraviolet emission around atomic potential through laser chirp
Substantial neutral atoms can tunnel to excited states in an intense laser field and subsequently generate coherent emission through free induction decay. We experimentally observe an enhanced coherent emission in the harmonic slightly below the threshold, which is consistent with the free induction...
| Main Authors: | , , , , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
Frontiers Media S.A.
2022-10-01
|
| Series: | Frontiers in Physics |
| Subjects: | |
| Online Access: | https://www.frontiersin.org/articles/10.3389/fphy.2022.990002/full |
| _version_ | 1797989896406695936 |
|---|---|
| author | Chun Yang Chun Yang Zhiyuan Lou Fan Yang Xiaochun Ge Yinghui Zheng Zhinan Zeng Ruxin Li |
| author_facet | Chun Yang Chun Yang Zhiyuan Lou Fan Yang Xiaochun Ge Yinghui Zheng Zhinan Zeng Ruxin Li |
| author_sort | Chun Yang |
| collection | DOAJ |
| description | Substantial neutral atoms can tunnel to excited states in an intense laser field and subsequently generate coherent emission through free induction decay. We experimentally observe an enhanced coherent emission in the harmonic slightly below the threshold, which is consistent with the free induction decay of Rydberg states produced by the frustrated tunnelling ionization (FTI) process. We further find that the intensity of the coherent emission significantly depends on the chirp of laser pulses. The simulations based on the strong field approximation model show that laser chirp affects the probability that the returned electrons recombine to the Rydberg states. Our result shows that coherent emission can be controlled by laser chirp, which facilitates understanding the dynamics of the Rydberg atom and coupling mechanism between the below-threshold harmonics and atomic energy level. In addition, the coherent below-threshold FTI emission we observed has small divergence which is good for EUV light source applications. |
| first_indexed | 2024-04-11T08:27:59Z |
| format | Article |
| id | doaj.art-707b4fe56e2746198173edddf95e61df |
| institution | Directory Open Access Journal |
| issn | 2296-424X |
| language | English |
| last_indexed | 2024-04-11T08:27:59Z |
| publishDate | 2022-10-01 |
| publisher | Frontiers Media S.A. |
| record_format | Article |
| series | Frontiers in Physics |
| spelling | doaj.art-707b4fe56e2746198173edddf95e61df2022-12-22T04:34:39ZengFrontiers Media S.A.Frontiers in Physics2296-424X2022-10-011010.3389/fphy.2022.990002990002Control of coherent extreme-ultraviolet emission around atomic potential through laser chirpChun Yang0Chun Yang1Zhiyuan Lou2Fan Yang3Xiaochun Ge4Yinghui Zheng5Zhinan Zeng6Ruxin Li7State Key Laboratory of High Field Laser Physics, Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Shanghai, ChinaCenter of Materials Science and Optoelectronics Engineering, University of Chinese Academy of Sciences, Beijing, ChinaState Key Laboratory of High Field Laser Physics, Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Shanghai, ChinaState Key Laboratory of High Field Laser Physics, Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Shanghai, ChinaState Key Laboratory of High Field Laser Physics, Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Shanghai, ChinaState Key Laboratory of High Field Laser Physics, Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Shanghai, ChinaState Key Laboratory of High Field Laser Physics, Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Shanghai, ChinaState Key Laboratory of High Field Laser Physics, Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Shanghai, ChinaSubstantial neutral atoms can tunnel to excited states in an intense laser field and subsequently generate coherent emission through free induction decay. We experimentally observe an enhanced coherent emission in the harmonic slightly below the threshold, which is consistent with the free induction decay of Rydberg states produced by the frustrated tunnelling ionization (FTI) process. We further find that the intensity of the coherent emission significantly depends on the chirp of laser pulses. The simulations based on the strong field approximation model show that laser chirp affects the probability that the returned electrons recombine to the Rydberg states. Our result shows that coherent emission can be controlled by laser chirp, which facilitates understanding the dynamics of the Rydberg atom and coupling mechanism between the below-threshold harmonics and atomic energy level. In addition, the coherent below-threshold FTI emission we observed has small divergence which is good for EUV light source applications.https://www.frontiersin.org/articles/10.3389/fphy.2022.990002/fullfrustrated tunnelling ionizationchirphigh-order harmonic generationRydberg statesionization potentialtime dependent Schrödinger equation |
| spellingShingle | Chun Yang Chun Yang Zhiyuan Lou Fan Yang Xiaochun Ge Yinghui Zheng Zhinan Zeng Ruxin Li Control of coherent extreme-ultraviolet emission around atomic potential through laser chirp Frontiers in Physics frustrated tunnelling ionization chirp high-order harmonic generation Rydberg states ionization potential time dependent Schrödinger equation |
| title | Control of coherent extreme-ultraviolet emission around atomic potential through laser chirp |
| title_full | Control of coherent extreme-ultraviolet emission around atomic potential through laser chirp |
| title_fullStr | Control of coherent extreme-ultraviolet emission around atomic potential through laser chirp |
| title_full_unstemmed | Control of coherent extreme-ultraviolet emission around atomic potential through laser chirp |
| title_short | Control of coherent extreme-ultraviolet emission around atomic potential through laser chirp |
| title_sort | control of coherent extreme ultraviolet emission around atomic potential through laser chirp |
| topic | frustrated tunnelling ionization chirp high-order harmonic generation Rydberg states ionization potential time dependent Schrödinger equation |
| url | https://www.frontiersin.org/articles/10.3389/fphy.2022.990002/full |
| work_keys_str_mv | AT chunyang controlofcoherentextremeultravioletemissionaroundatomicpotentialthroughlaserchirp AT chunyang controlofcoherentextremeultravioletemissionaroundatomicpotentialthroughlaserchirp AT zhiyuanlou controlofcoherentextremeultravioletemissionaroundatomicpotentialthroughlaserchirp AT fanyang controlofcoherentextremeultravioletemissionaroundatomicpotentialthroughlaserchirp AT xiaochunge controlofcoherentextremeultravioletemissionaroundatomicpotentialthroughlaserchirp AT yinghuizheng controlofcoherentextremeultravioletemissionaroundatomicpotentialthroughlaserchirp AT zhinanzeng controlofcoherentextremeultravioletemissionaroundatomicpotentialthroughlaserchirp AT ruxinli controlofcoherentextremeultravioletemissionaroundatomicpotentialthroughlaserchirp |