METHOD AND DEVICE FOR FREQUENCY CONVERSION, ESPECIALLY FOR DOUBLING THE FREQUENCY OF FIXED-FREQUENCY LASERS

摘要

The invention relates to a method and a device for frequency conversion, especially for frequency doubling of especially a continuous, fixed-frequency laser beam in a semi-monolithic structure. The device comprises a ring resonator consisting of a mirror and an optically non-linear crystal. The aim of the invention is to develop a method and device of this type by means of which the frequency conversion, especially the generation of the second harmonic, of continuous fixed-frequency laser radiation can be ensured without the disadvantages referred to but with great efficiency, significantly increased optomechanical stability and greatly simplified production. To this end the resonator length is adjusted by application of an electric voltage to an annular piezoelectric actuator (103) which is positioned between the mirror (101) and the crystal (102).