Production of sum-frequency radiation and ''even'' harmonics from the
mixed 1omega (1053 nm) and 2omega (527 nm) field is observed and compa
red to measurements of the relative conversion efficiency of the indep
endent fields. By controlling the relative polarization of the two fie
lds, we can control the mixing efficiency and produce coherent extreme
ultraviolet (XUV) radiation polarized orthogonally to the strong driv
ing field. Extension to produce XUV radiation of arbitrary polarizatio
n is discussed.