期刊
OPTICS LETTERS
卷 43, 期 22, 页码 5571-5574出版社
OPTICAL SOC AMER
DOI: 10.1364/OL.43.005571
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资金
- Russian Foundation for Basic Research (RFBR) [18-29-20031, 16-32-60164, 18-02-40034, 18-02-01141]
- Russian Science Foundation (RSF) [17-12-01533, 18-72-10109]
- Welch Foundation [A-1801-20180324]
- BASIS Foundation for the Advancement of Theoretical Physics and Mathematics [17-22-2233-1]
- Russian Science Foundation [18-72-10109, 17-12-01533] Funding Source: Russian Science Foundation
High-order harmonic generation (HHG) in plasmas induced by ultrashort, relativistic-intensity laser pulses on solid surfaces can provide an efficient source of attosecond pulses and opens routes toward new regimes of laser-matter interactions, x-ray generation, laser particle acceleration, and relativistic nonlinear optics. However, field intensities in the range of I-rel similar to 10(19) W/cm(2) are typically needed to achieve the relativistic regime of HHG in experiments with near-infrared laser pulses. Here, we show that, in the mid-infrared range, due to the lambda(-2) scaling of I-rel with the driver wavelength lambda, relativistic HHG can be observed at much lower levels of laser field intensities. High-peak-power 80-fs, 3.9-Ism pulses are focused in our experiments on a solid surface to provide field intensities in the range of 10(17) W/cm(2). Remarkably, this level of field intensities, considered as low by the standards of relativistic optics in the near infrared, is shown to be sufficient for generation of high-order harmonics with signature properties of relativistic HHG-beam directionality, spectra with extended plateaus, and a high HHG yield sustained for both p- and s-polarized driver fields. (C) 2018 Optical Society of America
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