VISIBLE TO ULTRAVIOLET BAND OPTICAL FREQUENCY CONVERTER

摘要

The present invention provides a visible ultraviolet band optical frequency converter. The processing period of a nonlinear optical crystal is controlled to provide an additional period phase to meet a phase matching condition so as to realize effective optical frequency conversion. The additional period phase is characterized in that phase gratings periodically arranged according to different refractive indexes are formed in the crystal through technologies, including laser micro-processing, ion etching and the like, a nonlinear frequency conversion inverse process is avoided through the periodic structure damage of the crystals in the phase gratings and an additional period phase is provided, phase mismatch caused by the insufficient double refraction of the nonlinear optical crystal is avoided, and efficient frequency doubling or sum frequency output is realized. By use of the optical frequency converter, the nonlinear optical material can be optimized, the proper crystal can be selected according to required wavelength, and the additional period phase matched with the technologies, such as laser lithography, can be provided so as to realize the effective output of specific wavelength. Anew variety is provided for the nonlinear optical frequency converter, and the optical frequency converter has the advantages of high optical frequency conversion efficiency, easiness in preparation and the like.