Abstract
This paper describes an optical ring resonator designed for frequency tripling of cw dye laser radiation in metal vapors. The five-mirror resonator contains a metal vapor cell and a prism which separates the laser radiation from the generated vacuum ultraviolet. A laser power of 800 mW (of 576 nm radiation) generated an intracavity power of 8.7 W. The two-photon resonant frequency tripling of this radiation produced in Sr vapor 1.9 × 10 10 photons s -1 (20.3 nW) of 192 nm VUV radiation. Compared to previous investigations of this third harmonic generation the intracavity tripling improves the efficiency by almost two orders of magnitude.
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