Domain structured optical device and method for manufacturing the same.

摘要

An optical device (10) having a periodic inverted domain construction is used for second harmonic generating devices or the like. The optical device comprises a ferroelectric crystal substrate (1) which is provided in this surface with a periodic inverted domain structure (3) consisting of a plurality of parallel inverted domain regions (3A) arranged at intervals. The thickness t and width w of the inverted domain regions and the thickness T of the ferroelectric crysal substrate meet the criteria expressed by: t/w >/= 1 and 0.1 < t/T </= 1. The periodic inverted domain structure is obtained by exposing the surface of the ferroelectric crystal substrate to a beam of charged particles. <IMAGE>