Optical device.

摘要

An optical device has multilayer films (1) formed by periodically laminating a number of layers each comprising at least two kinds of optical crystal thin films (fn, gn) having different refractive indices onto a substrate (3). The multilayer films (1) include a semiconductor material having a large non-linear optical coefficient as a composing material and have the artificial optical anisotropy. Since the multilayer films (1) of the optical device have the large non-linear coefficient and the optical anisotropy, the non-linear phenomenon such as second-harmonic generation or the like can be efficiently caused.