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MO: Fachverband Molekülphysik

MO 4: Novel Experimental Approaches and Novel Theoretical and Computational Approaches

MO 4.5: Vortrag

Montag, 2. März 2026, 18:15–18:30, P 105

Novel 340kW continuous-wave enhancement cavity — •Andriana Tsikritea — Department of Physics, TU Dortmund University, 44227, Dortmund, Germany

The design and development of a novel Fabry-Pérot enhancement cavity will be discussed. Using a 43 W continuous-wave input laser at 1064 nm, we report intracavity circulating powers greater than 340 kW and peak laser intensities of 8.7 GW/cm2. Implementing a fast switching scheme, the high-power laser is allowed to circulate the enhancement cavity for specified time durations, spanning 100 μs to 100 ms. The low duty cycle of the switching scheme allows the minimisation of heating effects on the cavity optical components, while simultaneously offering stable and repeatable pulses of the high-power laser.

The enhancement cavity is currently being integrated with a moving magnetic decelerator and superconductive trap apparatus. The high intracavity laser intensity will be used to optically trap polarisable molecular species. For example, for O2 molecules, the reported 340 kW laser power generates a 200 mK deep optical trapping potential. Subsequently, the evaporative cooling of the molecular ensemble will be attempted. With no laser cooling scheme implemented, the optical trapping experiments enabled by the enhancement cavity pave the way for the generation of laser-cooling-free quantum degenerate molecular gases.

Keywords: Cold molecules; Enhancement cavity; Optical dipole trapping