Abstract

We have demonstrated a tunable single frequency source of continuous-wave (CW) coherent ultraviolet (UV) radiation at λ _3ω = 326 nm. Laser light of a tunable diode laser at λ_ω = 977 nm was split and injected into two independent fiber amplifiers yielding 1 W and 0.4 W, respectively. The 1 W branch was resonantly frequency doubled, resulting in 120 mW of useful power at λ_2ω = 488 nm. The third harmonic was generated by summation of the second branch of λ_ω and λ_2ω which were enhanced by a doubly resonant cavity. This light source has TEM₀₀ character and can be continuously tuned over more than 18 GHz. It is of interest for efficient laser cooling of In and potentially other applications.

© 2008 Optical Society of America

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History
Original Manuscript: April 21, 2008
Manuscript Accepted: June 29, 2008
Revised Manuscript: June 25, 2008
Published: July 3, 2008

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Author Affiliations

Jae-Ihn Kim, Dieter Meschede

Institut für Angewandte Physik, Universität Bonn

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