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Title: Extension of harmonic cutoff in a multicycle chirped pulse combined with a chirp-free pulse

Abstract

We demonstrate high-order harmonic generation in a wave form synthesized by a multicycle 800-nm chirped laser pulse and a chirp-free laser pulse. Compared with the case of using only a chirped pulse, both the harmonic cutoff and the extreme ultraviolet supercontinuum can be extended when a weak chirp-free pulse is combined with the chirped pulse. When chirp-free pulse intensity grows, the cutoff energy and bandwidth of the supercontinuum grow as well. It is found that the broad supercontinuum can be achieved for a driving pulse with long duration even though the driving pulse reaches 10 optical cycles. An isolated attosecond pulse with duration of about 59 as is obtained, and after appropriate phase compensation with a duration of about 11 as. In addition, by performing time-frequency analyses and the classical trajectory simulation, the difference in supercontinuum generation between the preceding wave form and a similar wave form synthesized by an 800-nm fundamental pulse and a 1600-nm subharmonic pulse is investigated.

Authors:
; ;  [1]
  1. State Key Laboratory of High Field Laser Physics, Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, P.O. Box 800-211, Shanghai 201800 (China)
Publication Date:
OSTI Identifier:
21528738
Resource Type:
Journal Article
Journal Name:
Physical Review. A
Additional Journal Information:
Journal Volume: 82; Journal Issue: 5; Other Information: DOI: 10.1103/PhysRevA.82.053822; (c) 2010 The American Physical Society; Journal ID: ISSN 1050-2947
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; EXTREME ULTRAVIOLET RADIATION; FREQUENCY ANALYSIS; HARMONIC GENERATION; LASERS; PULSES; SIMULATION; TRAJECTORIES; WAVE FORMS; ELECTROMAGNETIC RADIATION; FREQUENCY MIXING; RADIATIONS; ULTRAVIOLET RADIATION

Citation Formats

Junjie, Xu, Bin, Zeng, and Yongli, Yu. Extension of harmonic cutoff in a multicycle chirped pulse combined with a chirp-free pulse. United States: N. p., 2010. Web. doi:10.1103/PHYSREVA.82.053822.
Junjie, Xu, Bin, Zeng, & Yongli, Yu. Extension of harmonic cutoff in a multicycle chirped pulse combined with a chirp-free pulse. United States. doi:10.1103/PHYSREVA.82.053822.
Junjie, Xu, Bin, Zeng, and Yongli, Yu. Mon . "Extension of harmonic cutoff in a multicycle chirped pulse combined with a chirp-free pulse". United States. doi:10.1103/PHYSREVA.82.053822.
@article{osti_21528738,
title = {Extension of harmonic cutoff in a multicycle chirped pulse combined with a chirp-free pulse},
author = {Junjie, Xu and Bin, Zeng and Yongli, Yu},
abstractNote = {We demonstrate high-order harmonic generation in a wave form synthesized by a multicycle 800-nm chirped laser pulse and a chirp-free laser pulse. Compared with the case of using only a chirped pulse, both the harmonic cutoff and the extreme ultraviolet supercontinuum can be extended when a weak chirp-free pulse is combined with the chirped pulse. When chirp-free pulse intensity grows, the cutoff energy and bandwidth of the supercontinuum grow as well. It is found that the broad supercontinuum can be achieved for a driving pulse with long duration even though the driving pulse reaches 10 optical cycles. An isolated attosecond pulse with duration of about 59 as is obtained, and after appropriate phase compensation with a duration of about 11 as. In addition, by performing time-frequency analyses and the classical trajectory simulation, the difference in supercontinuum generation between the preceding wave form and a similar wave form synthesized by an 800-nm fundamental pulse and a 1600-nm subharmonic pulse is investigated.},
doi = {10.1103/PHYSREVA.82.053822},
journal = {Physical Review. A},
issn = {1050-2947},
number = 5,
volume = 82,
place = {United States},
year = {2010},
month = {11}
}