OPTICAL WAVELENGTH CONVERTING ELEMENT

摘要

PURPOSE:To obtain an element which has high conversion efficiency and allows easy mounting and dismounting by providing a light guide to a substrate consisting of a beta-BaB2O4 single crystal, projecting a basic wave to one end face thereof and taking out the converted second harmonic wave. CONSTITUTION:A photoresist is coated on the Z cut face of the beta-BaB2O4 single crystal substrate 1 and a window is opened in the resist. An Al film is then deposited by evaporation thereon and the Al is diffused after lifting off to form the Al-diffused light guide 2. The 2nd harmonic wave 6 subjected to a wavelength conversion is generated in the substrate and can be taken out of the exit end face when the basic wave 5 is cast through a condenser lens 4 from a laser light source 3 to the end face of this guide 2. The converting element can be formed in such a manner. Coupling of optical fibers for incidence and guiding to the element in the stage of forming the element is also possible. The element which has the high conversion efficiency and allows easy handling is thereby obtd.