Freiburg 2019 – wissenschaftliches Programm

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FM: Fall Meeting

FM 73: Quantum Sensing: Applications & Spectroscopy

FM 73.6: Talk

Donnerstag, 26. September 2019, 15:15–15:30, Aula

Optomechanical stability of the superradiant laser — •Simon B. Jäger¹, John Cooper², Murray J. Holland², and Giovanna Morigi¹ — ¹Theoretische Physik, Universität des Saarlandes, D-66123 Saarbrücken, Germany — ²JILA, National Institute of Standards and Technology and Department of Physics, University of Colorado, Boulder, Colorado 80309-0440, USA

Time and frequency standards require the realization of extremely stable high-Q oscillators. For lasers this oscillator is usually a small-linewidth resonator mode and the laser linewidth is bounded by fluctuations of the resonator length. Remarkably these limitations can be ovecome by coupling many atoms to a rather large-linewidth resonator mode and storing coherences in the atomic supperadiant collective dipole. In this superradiant laser the linewidth is bounded by the single-particle linewidth that can be of the order of mHz. This prediction has been obtained in studies discarding the effect of inhomogeneous broadening of the medium. In this work we theoretically study the optomechanical dynamics of an ensemble of atoms in the regime in which superradiant lasing is expected. We show that, in absence of an external confinement, self-stabilized lasing structures can form when the superradiant decay rate exceeds a threshold determined by the recoil frequency. The dynamics can become chaotic, leading to the emission of chaotic light, when the pump rate is below a certain threshold. These phases can be revealed in the coherence properties of the light at the cavity output and emerge from the interplay between quantum fluctuations, dissipation, and noise.