Fa. Weihe et Ph. Bucksbaum, MEASUREMENT OF THE POLARIZATION STATE OF HIGH HARMONICS GENERATED IN GASES, Journal of the Optical Society of America. B, Optical physics, 13(1), 1996, pp. 157-161
We have measured the polarization of high harmonics of 785-nm Ti:sapph
ire radiation. The harmonics were generated in argon and nitrogen gas.
When the driving field is elliptically polarized, there is, in genera
l, an offset angle between the major axis of the driving field's polar
ization ellipse and the polarization of the harmonics. The ellipticity
of the harmonic polarization is also generally different from that of
the driving field. There are substantial differences in behavior betw
een the two gases, particularly for harmonics whose energies lie close
to the ionization potential. (C) 1996 Optical Society of America