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A: Fachverband Atomphysik

A 41: Poster Session IIIa

A 41.28: Poster

Donnerstag, 8. März 2018, 16:15–18:15, Orangerie

Phasetransition of a Bose-Einstein condensate in an optical ring resonator with internal coupling — •Simon C. Schuster, Philip E. Wolf, Sebastian Slama, and Claus Zimmermann — Physikalisches Institut, University Tübingen

We investigate the dynamics of an atomic Bose Einstein condensate interacting with the light modes of a high-finesse ring resonator. Two counterpropagating longitudinal modes of the resonator are coupled by the atoms due to coherent light scattering. Previous work ([1],[2]) explored Collective Atomic Recoil lasing (CARL) and its threshold for various pump-resonator detuning. With our newly developed sub-recoil resolving ring resonator we investigate the transition between the CARL-regime and a new steady state regime. This new regime emerges in the presence of additional coupling between the two counterpropagating modes. We present experimental evidence of the steady-state and determine the phase boundary for various internal coupling rates.

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[1] D. Schmidt et al., Phys. Rev. Lett. 112, 115302 (2014)

[2] H. Tomczyk et al., Phys. Rev. A 91, 063837 (2015)