We report on an efficient generation of cw ultraviolet radiation (257 nm) using external resonant doubling. The technique of second- harmonic generation (SHG) for cw tight has been developed by following two different approaches: an intracavity method1 and an external resonant cavity method.2 Recently, 257-nm cw radiation of over 1 W was generated1 by the intracavity method, using a libarium borate (BBO) crystal and an argon laser. However, from the viewpoint of practical use, laser-diode-pumped solid-state lasers (such as YAG) are becoming very attractive as fundamental light sources for generating deep ultraviolet light, which is fouth harmonic. In this application, efficient external resonant doubling is required.
© 1993 Optical Society of AmericaPDF Article
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