Nonlinear optical materials

摘要

A nonlinear optical material having a high nonlinear optical constant useful for frequency doubler of laser beam which comprises a chiral smectic C liquid crystalline polyester consisting essentially of the structural units having the general formulae (A), (B) and (C); (* CHEMICAL STRUCTURE *) Wherein X is a structural unit selected from the group consisting of (* CHEMICAL STRUCTURE *) (* CHEMICAL STRUCTURE *) (* CHEMICAL STRUCTURE *) (* CHEMICAL STRUCTURE *) (* CHEMICAL STRUCTURE *) (* CHEMICAL STRUCTURE *) (* CHEMICAL STRUCTURE *) (* CHEMICAL STRUCTURE *) (* CHEMICAL STRUCTURE *) (B)+BL,4 -O-Y-O-+BL,4444 1-60 mol % Wherein Y is a group having at least one optically active carbon and the total carbon number of Y is 3-12. (* CHEMICAL STRUCTURE *) wherein n is an integer of 2-10.