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high-order harmonic spectrum

Laser and Particle Beams (1)

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1 results

Extension of harmonic cut-off in a waveform controlled laser field by prolonging the recombining period
Junjie Xu, Yongli Yu, Bin Zeng
Journal:

Laser and Particle Beams / Volume 28 / Issue 3 / September 2010

Published online by Cambridge University Press:

20 July 2010, pp. 415-419
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We present a novel waveform synthesized by a half-cycle fundamental wave (800 nm) and a half-cycle subharmonic wave (2400 nm) with an appropriate carrier-envelope phase and a phase delay, in which more ionized electrons can recombine with its parent ions to emit high-order harmonic, giving rise to both the extension of the extreme ultraviolet supercontinuum and the enhancement of harmonic conversion efficiency. An isolated attosecond pulse with considerable energy is obtained as well. By performing time-frequency analyses, it is revealed that the prolonged opposite electric field increases the recombining probability of high-energy electrons.