  The optically induced reorientation of nematic liquid crystal doped with
azo-dye substituted polymer is investigated measuring photoinduced
birefringence. These measurement reveal the value (Dn~0.1) of induced
birefringence of liquid crystal with dye polymer which significantly exceeds
the value of birefringence previously obtained in nematic mixture with the low
molecular weight dye. More than one order of enhancement is connected with
lower diffusivity of polymer.
