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Generation of an isolated sub-40-as pulse using two-color laser pulses: Combined chirp effects

Generation of an isolated sub-40-as pulse using two-color laser pulses: Combined chirp effects In this paper, we theoretically discuss the combined chirp effects on the isolated attosecond generation when a model Ar is exposed to an intense 5-fs, 800-nm fundamental chirped pulse combined with a weak 10-fs, 1200-nm controlling chirped pulse. It shows that for the case of the chirp parameters β 1 = 6.1 (corresponding to the 800-nm field) and β 2 = 4.0 (corresponding to the 1200-nm field), both the harmonic cutoff energy and the supercontinuum can be remarkably extended resulting in a 663-eV bandwidth. Moreover, due to the introduction of the chirps, the short quantum path is selected to contribute to the harmonic spectrum. Finally, by superposing a properly selected harmonic spectrum in the supercontinuum region, an isolated pulse as short as 31 as (5 as) is generated without (with) phase compensation. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Physical Review A American Physical Society (APS)

Generation of an isolated sub-40-as pulse using two-color laser pulses: Combined chirp effects

Feng, Liqiang; Chu, Tianshu
Physical Review A , Volume 84 (5) – Nov 1, 2011
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Publisher
American Physical Society (APS)
Copyright
Copyright © 2011 The American Physical Society
ISSN
1094-1622
DOI
10.1103/PhysRevA.84.053853
Publisher site
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Abstract

In this paper, we theoretically discuss the combined chirp effects on the isolated attosecond generation when a model Ar is exposed to an intense 5-fs, 800-nm fundamental chirped pulse combined with a weak 10-fs, 1200-nm controlling chirped pulse. It shows that for the case of the chirp parameters β 1 = 6.1 (corresponding to the 800-nm field) and β 2 = 4.0 (corresponding to the 1200-nm field), both the harmonic cutoff energy and the supercontinuum can be remarkably extended resulting in a 663-eV bandwidth. Moreover, due to the introduction of the chirps, the short quantum path is selected to contribute to the harmonic spectrum. Finally, by superposing a properly selected harmonic spectrum in the supercontinuum region, an isolated pulse as short as 31 as (5 as) is generated without (with) phase compensation.

Journal

Physical Review A – American Physical Society (APS)

Published: Nov 1, 2011

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