Open AccessThe relationship between conversion efficiency of high-order harmonic generation from atom and wavelength in two-color combined fields
Author(s) -
Cao Wei-Jun,
Cheng Chun-Zhi,
Xiaoxin Zhou
Publication year - 2011
Publication title -
wuli xuebao
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.199
H-Index - 47
ISSN - 1000-3290
DOI - 10.7498/aps.60.054210
Subject(s) - laser , harmonics , wavelength , energy conversion efficiency , high harmonic generation , optics , physics , field (mathematics) , helium atom , harmonic spectrum , materials science , position (finance) , harmonic , intensity (physics) , atomic physics , optoelectronics , helium , quantum mechanics , mathematics , finance , voltage , pure mathematics , economics
By solving the time-dependent Schrödinger equation under velocity gauge with split-operator method, we studied the high harmonics of one-dimensional helium atom exposed to one-color laser field and two-color fields composed of IR field and UV field. And the relationship between conversion efficiency of high-order harmonic generation near the cut-off position and wavelength of the laser (800—2000 nm) was also analyzed. It was found that high-order harmonic conversion efficiency driven by two-color laser field near the cut-off position changes with wavelength as η(λ)∝λx,where the x value depends on the intensity of laser field, and the appropriate selection of intensity of combined laser field can improve high harmonic conversion efficiency near the cut-off position.