Freiburg 2024 – scientific programme
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Q: Fachverband Quantenoptik und Photonik
Q 57: Poster VIII
Q 57.7: Poster
Thursday, March 14, 2024, 17:00–19:00, Aula Foyer
Generation of cw UV radiation using elliptical focusing enhancement cavities — •Jens Gumm1, Daniel Preißler1, and Thomas Walther1,2 — 1TU Darmstadt — 2HFHF 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 efficiencies compared to the spherical optimum and decreases the peak intensity in the nonlinear crystal.
Experimentally, we demonstrated UV powers in excess of 2W.
Keywords: enhancement cavities; uv generation; elliptical focusing; BBO