期刊
PHYSICAL REVIEW A
卷 103, 期 6, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevA.103.063112
关键词
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资金
- Max-Planck-Gesellschaft via the IMPRS for Dynamical Processes in Atom, Molecules, and Solids
- Center for Emergent Materials, an NSF MRSEC [DMR-2011876]
- Swiss National Science Foundation [P400P2_191117]
- Institute for Basic Science [IBS-R012-D1]
- Swiss National Science Foundation (SNF) [P400P2_191117] Funding Source: Swiss National Science Foundation (SNF)
The study reveals that the duration of the laser pulse significantly affects the quantum number distribution of Rydberg states, thereby impacting the EUV yield for coherent high-frequency radiation. Analysis of electron trajectories identifies elastic recollision as the underlying cause of this change.
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)]. 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.
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