Xin-Lei Ge, Chang-Long Xia, and Xue-Shen Liu*
Institute of Atomic and Molecular Physics, Jilin University, Changchun 130012, China
*e-mail: liuxs@jlu.edu.cn
Received January 9, 2012; published online October 1, 2012
Abstract—We theoretically propose a three-color laser scheme to enhance the high-order harmonic intensity
and generate an isolated attosecond pulse. By adding a 3 fs, 1600 nm laser pulse to a synthesized two-color laser
field (5 fs, 800 nm and 10 fs, 1200 nm), the harmonic intensity is effectively enhanced and an isolated attosec-
ond pulse with duration 41 as is generated. In this scheme, the short trajectory is suppressed, the selection of
the long quantum path can be achieved. We also investigate emission time of harmonics in terms of the time-
frequency analysis and the semi-classical three-step model to illustrate the physical mechanism of high-order
harmonic generation.
DOI: 10.1134/S1054660X12110035
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