IMPROVED FREQUENCY MULTIPLIER AND METHOD OF PRODUCING THE SAME

摘要

A frequency-converted laser apparatus including a laser source (10) which generates primary radiation, a Bragg reflector (24) which reflects part of the primary radiation within a frequency range centered at a preselected fundamental frequency back along an optical path to the laser source (10) thereby to form an external laser cavity including the laser source (10) resonant at the preselected fundamental frequency, and a frequency converter (22) located within the external laser cavity on the optical path between the laser-source (10) and the Bragg reflector (24) and operative to convert part of the primary radiation into frequency-converted secondary radiation. There is also provided a method of forming on the surface of a crystal a frequency converting optical waveguide including a plurality of periodic segments comprising sections of a first kind, having a first electric polarity, and sections of a second kind, having a second electric polarity, including making a plurality of discrete regions on the surface of the crystal according to a preselected masking pattern, preparing an ion exchanging molten salt solution, controlling the concentration of oxides in the molten salt solution, immersing the masked surface ot the crystal in the molten salt solution for a preselected period of time and removing the masking material from the surface of the crystal.