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Controlling quantum numbers and light emission of Rydberg states via the laser pulse duration

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Title
Controlling quantum numbers and light emission of Rydberg states via the laser pulse duration
Author(s)
Ortmann, L.; Hofmann, C.; I. A. Ivanov; Landsman, A.S.
Publication Date
2021-06
Journal
Physical Review a, v.103, no.6
Publisher
AMER PHYSICAL SOC
Abstract
© 2021 American Physical Society.High-order harmonic generation (HHG) creates coherent high-frequency radiation via the process of strong field ionization followed by recombination. Recently, a complementary approach based on frustrated tunnel ionization (FTI) was demonstrated [Yun et al., Nat. Photon. 12, 620 (2018)1749-488510.1038/s41566-018-0255-8]. It uses spectrally separated peaks created by lower quantum number Rydberg states to produce coherent extreme ultraviolet (EUV) light. While much is understood about enhancing emission from HHG by controlling recombining electron trajectories, relatively little is known about controlling the quantum number distribution of Rydberg states. This distribution is generally believed to be determined primarily by field strength and laser frequency. We show that, in fact, it also changes significantly with the duration of the laser pulse: Increasing pulse duration depletes lower lying Rydberg states, thereby substantially decreasing EUV yield. Using electron trajectory analysis, we identify elastic recollision as the underlying cause. Our results open the door to greater control over production of coherent high-frequency radiation, by combining FTI and HHG mechanisms, and also improved the interpretation of molecular imaging experiments that rely on elastic electron recollision.
URI
https://pr.ibs.re.kr/handle/8788114/9959
DOI
10.1103/PhysRevA.103.063112
ISSN
2469-9926
Appears in Collections:
Center for Relativistic Laser Science(초강력 레이저과학 연구단) > 1. Journal Papers (저널논문)
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