Patent ID: 7736548

Claim:
A non-linear optical device comprising a polymer configured to provide a grating holding ratio of 20% or higher after about four minutes, wherein the polymer comprises a first repeating unit comprising a first moiety having formula (M-1) and a second repeating unit comprising a second moiety having formula (M-2): wherein each Q in (M-1) and (M-2) independently represents an unsubstituted or substituted alkylene group; and wherein Ra 1 -Ra 8 and Rb 1 -Rb 27 in (M-1) and (M-2) are each independently selected from the group consisting of hydrogen, C 1 -C 10 alkyl, C 4 -C 10 aryl and C 4 -C 10 heteroaryl wherein the ratio of the first to second repeating units is in the range of about 1:10 to about 5:1.