Open AccessGeneration of isolated soft x-ray attosecond pulses with mid-infrared driving lasers via transient phase-matching gating
Author(s) -
Baochang Li,
Kan Wang,
Xiangyu Tang,
Yanbo Chen,
C. D. Lin,
Cheng Jin
Publication year - 2021
Publication title -
new journal of physics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.584
H-Index - 190
ISSN - 1367-2630
DOI - 10.1088/1367-2630/ac136f
Subject(s) - physics , attosecond , laser , optics , gating , high harmonic generation , harmonics , coherence (philosophical gambling strategy) , ultrashort pulse , water window , femtosecond , ionization , voltage , physiology , ion , quantum mechanics , biology
Isolated attosecond pulses (IAPs) in the soft x-ray (SXR) region are highly desirable for attosecond time-resolved experiments. Here we identify a transient phase matching gating method for the generation of such IAPs with mid-infrared (MIR) lasers. This gating method works when a loosely focused, long-duration MIR Gaussian driving beam is slightly reshaped during its propagation in the gas medium under the ‘critical’ ionization condition. Quantitatively, the calculated coherence length of high harmonic is used to analyze the mechanism of the gating method, by using one-dimensional plane-wave beams and by comparing 2000 nm and 800 nm lasers. The robustness of the generation method is checked by varying laser’s carrier-envelope-phase and gas pressure. This gating method provides with an alternative route to efficiently produce tabletop ultrashort attosecond SXR light sources with the emerging MIR lasers.