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Q: Fachverband Quantenoptik und Photonik

Q 1: Laser Technology and Applications (joint session Q/K)

Q 1.2: Vortrag

Montag, 10. März 2025, 11:15–11:30, HS V

Generation of high power cw UV radiation using elliptical focusing enhancement cavities — •Jens Gumm, Denise Schwarz, and Thomas Walther — TU Darmstadt

Long term cw laser operation with high output power in the UV spectral range is of great interest in many scientific and commercial applications.
Generation of cw-UV light is often realized by resonant second harmonic generation employing β-Barium Borate (BBO) as the nonlinear optical medium. A known parasitic effect in BBO is the degradation of the crystal due to two-photon absorption.
We theoretically showed that elliptical focusing can lead to higher conversion compared to the spherical optimum and significantly decreases the peak intensity in the nonlinear crystal. Experimentally, we demonstrated UV powers in excess of 2.4W with a fundamental power of 14W.

Keywords: UV generation; elliptical enhancement cavities; high power; BBO