Monochromatic source, such as laser or light source associated with interference filters, comprises an optically active material formed by transparent matrix including photoluminescent dopants

摘要

Optically active material is formed by transparent matrix including photoluminescent dopants emitting radiation of wavelength lambda 2 when they receive excitation radiation of wavelength lambda 1. Matrix input surface is coated with dichroic coating with transmission band for lambda 1 and reflection band for lambda 2. Non-input and non-output surfaces have reflecting layers for wavelengths lambda 2 at least. The monochromatic light source includes a light source (7, 8, 9) emitting light radiation, preferably ultraviolet radiation, towards the doped matrix (2) input surface and a periodically poled lithium niobate (PPLN) crystal receiving the radiation emitted by the output surface (5). The transparent matrix has parallelepipedal or cylindrical form. At least one of its surfaces is an input surface, and a part of at least one face of a section below the input surface is an output surface (5). The other surfaces are coated with a reflecting layer for wavelengths of lambda 2 at least. Preferably, the source includes a number doped materials and a number of sources, as well as a concentrator for collecting the radiation emitted by the output surfaces (5). The source also preferably includes an optical fiber having one end optically connected to the output surface (5) of the doped material and the other end connected to the PPLN crystal. Excitation wavelength lambda 1 is 300-400 nm, especially 365 nm, and radiation emission wavelength lambda 2 is 600-700 nm, especially 650 nm.