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Optics Express

Optics Express

  • Editor: C. Martijn de Sterke
  • Vol. 20, Iss. 19 — Sep. 10, 2012
  • pp: 21346–21356

Broadband isolated attosecond pulse with high spatiotemporal quality in pre-excited medium by multi-cycle two-color fields

Jianghua Luo, Weiyi Hong, Qingbin Zhang, Yang Li, and Peixiang Lu  »View Author Affiliations


Optics Express, Vol. 20, Issue 19, pp. 21346-21356 (2012)
http://dx.doi.org/10.1364/OE.20.021346


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Abstract

We propose a scheme that combines multi-cycle two-color pump pulses and pre-excited medium to simultaneously control the ionization and acceleration steps of electron wave packet. Intense two-plateau supercontinua are observed at microscopic level, which support isolated attosecond pulse with tunable central wavelength. We further investigate the propagation effects and find that the macroscopic response is mainly associated with the initial population of the excited state. Large initial population can distort the pump field and weaken the phase-matching of the supercontinua due to the high density of free electrons. On the contrary, small initial population of 3% can generate well phase-matched supercontinua, and an efficient isolated attosecond pulse with gaussian-like spatial distribution is directly achieved. The divergence angle of the generated pulse is less than 0.2 mrad, which indicates its beam quality is good. This pulse benefits for some potential applications of ultrafast measurements with high spatiotemporal resolutions.

© 2012 OSA

OCIS Codes
(190.4160) Nonlinear optics : Multiharmonic generation
(190.7110) Nonlinear optics : Ultrafast nonlinear optics
(300.6560) Spectroscopy : Spectroscopy, x-ray

ToC Category:
Nonlinear Optics

History
Original Manuscript: June 29, 2012
Revised Manuscript: August 24, 2012
Manuscript Accepted: August 24, 2012
Published: September 4, 2012

Citation
Jianghua Luo, Weiyi Hong, Qingbin Zhang, Yang Li, and Peixiang Lu, "Broadband isolated attosecond pulse with high spatiotemporal quality in pre-excited medium by multi-cycle two-color fields," Opt. Express 20, 21346-21356 (2012)
http://www.opticsinfobase.org/oe/abstract.cfm?URI=oe-20-19-21346


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