Waveforms for optimal sub-keV high-order harmonics with synthesized two- or three-colour laser fields

Cheng Jin, Guoli Wang, Hui Wei, Anh-Thu Le and C. D. Lin ()
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Cheng Jin: J. R. Macdonald Laboratory, Kansas State University
Guoli Wang: J. R. Macdonald Laboratory, Kansas State University
Hui Wei: J. R. Macdonald Laboratory, Kansas State University
Anh-Thu Le: J. R. Macdonald Laboratory, Kansas State University
C. D. Lin: J. R. Macdonald Laboratory, Kansas State University

Nature Communications, 2014, vol. 5, issue 1, 1-6

Abstract: Abstract High-order harmonics extending to the X-ray region generated in a gas medium by intense lasers offer the potential for providing tabletop broadband light sources but so far are limited by their low conversion efficiency. Here we show that harmonics can be enhanced by one to two orders of magnitude without an increase in the total laser power if the laser’s waveform is optimized by synthesizing two- or three-colour fields. The harmonics thus generated are also favourably phase-matched so that radiation is efficiently built up in the gas medium. Our results, combined with the emerging intense high-repetition MHz lasers, promise to increase harmonic yields by several orders to make harmonics feasible in the near future as general bright tabletop light sources, including intense attosecond pulses.

Date: 2014
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DOI: 10.1038/ncomms5003

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