The effect of straight dislocations upon the second-order non-linear optical susceptibility of cubic non-centrosymmetrical media was modelled. The resultant degradation of the susceptibility was evaluated for screw and edge dislocations. It was found that single screw and edge dislocations reduced the susceptibility of the present material by some 30 and 60%, respectively. This implied that second-order non-linear optical effects were very sensitive to misfit dislocation generation in epitaxially grown non-centrosymmetrical media, and that dislocation-free epilayers were required in order to obtain the optimum susceptibility.

D.J.Bottomley: Applied Physics Letters, 1995, 67[25], 3682-4