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Z. Naturforsch. 69a, 673 – 686
(2014)
doi:10.5560/ZNA.2014-0067
Intense Isolated Ultrashort Attosecond Pulse Generation in a Multi-Cycle Three-Colour Laser Field
Department of Physics and Information Technology, Baoji University of Arts and Sciences, Baoji 721016, China
Received May 28, 2014 / revised August 17, 2014 / published online November 20, 2014
Reprint requests to: G.-T. Z; E-mail:
gtzhang79@163.com
An efficient method for generating an intense isolated ultrashort attosecond pulse is presented theoretically. By adding a 267 nm controlling pulse to a multi-cycle two-colour field, not only the spectral cutoff and the yields of the harmonic spectrum are evidently enhanced, but also the selection of the single quantum path is realised. Then a high-efficiency supercontinuum with a 504 eV bandwidth and smooth structure is obtained, which enables the production of an intense isolated 30 as pulse. In addition, the influences of the laser parameters on the supercontinuum and isolated attosecond pulse are investigated.
Key words: High-Order Harmonic Generation; Isolated Attosecond Pulse; Quantum Path Selection; Three-Colour Field.