Mainz 2026 – wissenschaftliches Programm
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Q: Fachverband Quantenoptik und Photonik
Q 38: Precision Spectroscopy of Atoms and Ions III (joint session A/Q)
Q 38.5: Vortrag
Mittwoch, 4. März 2026, 15:45–16:00, N 3
Development of a cw laser system at 185nm — •Jonas Gottschalk, Sascha Heider, Thorsten Groh, Simon Stellmer, and UVQuanT Consortium — Universität Bonn, Germany
Many of the strong transitions in diatomic molecules with double bonds, such as O2, N2 or NO, are located in the vacuum-UV part of the spectrum between 100 and 200 nm. The generation of tunable cw light in this wavelength range remains a major challenge, but recent advancements in laser technology motivate new attempts.
We present a DUV laser system based on two continuous-wave VECSEL lasers, one operating at 431.4 nm via intracavity frequency doubling and the other at 1299.8 nm.
The fundamental waves are combined in a sequence of sum-frequency-generation stages to produce light at 185 nm.
We will use the system to perform spectroscopy on the 1S0 - 1P1 transition of mercury and to explore molecular oxygen lines in the Schumann-Runge bands, with implications for fundamental physics and astrochemistry.
Keywords: SFG; DUV; Nonlinear Optics; UV Laser; Spectroscopy