GENERATION OF CIRCULARLY POLARIZED MULTIPLE HIGH-ORDER              HARMONIC
EMISSION FROM TWO-COLOR CROSSED LASER BEAMS

 Xiao-Min Tong and Shih-I Chu*

Department of Chemistry, University of Kansas, and Kansas
 Center for Advanced Scientific Computing, Lawrence, Kansas, 66045 USA

  We present a scheme for the production of circularly polarized (CP) high-order

harmonic generation (HHG). The proposed experimental setup involves  the use
of two-color laser fields, consisting of a CP fundamental laser  field and a
linealy
polarized 2nd-harmonic laser field, in crossed beam  configuration. The
feasibility
of such a scheme is demonstrated by an ab initio study of the HHG power spectrum

of He atoms by means of a  self-interaction-free time-dependent density
functional
theory recently developed.

* E-mail address:  sichu@kuhub.cc.ukans.edu