Coherent Polariton Laser
2016; American Physical Society; Volume: 6; Issue: 1 Linguagem: Inglês
10.1103/physrevx.6.011026
ISSN2160-3308
AutoresSeonghoon Kim, Bo Zhang, Zhaorong Wang, Julian Fischer, Sebastian Brodbeck, M. Kamp, Christian Schneider, Sven Höfling, Hui Deng,
Tópico(s)Plasmonic and Surface Plasmon Research
ResumoThe semiconductor polariton laser promises a new source of coherent light, which, compared to conventional semiconductor photon lasers, has input-energy threshold orders of magnitude lower. However, intensity stability, a defining feature of a coherent state, has remained poor. Intensity noise many times the shot noise of a coherent state has persisted, attributed to multiple mechanisms that are difficult to separate in conventional polariton systems. The large intensity noise, in turn, limits the phase coherence. Thus, the capability of the polariton laser as a source of coherence light is limited. Here, we demonstrate a polariton laser with shot-noise-limited intensity stability, as expected from a fully coherent state. This stability is achieved by using an optical cavity with high mode selectivity to enforce single-mode lasing, suppress condensate depletion, and establish gain saturation. Moreover, the absence of spurious intensity fluctuations enables the measurement of a transition from exponential to Gaussian decay of the phase coherence of the polariton laser. It suggests large self-interaction energies in the polariton condensate, exceeding the laser bandwidth. Such strong interactions are unique to matter-wave lasers and important for nonlinear polariton devices. The results will guide future development of polariton lasers and nonlinear polariton devices.Received 25 July 2015DOI:https://doi.org/10.1103/PhysRevX.6.011026This article is available under the terms of the Creative Commons Attribution 3.0 License. Further distribution of this work must maintain attribution to the author(s) and the published article's title, journal citation, and DOI.Published by the American Physical SocietyPhysics Subject Headings (PhySH)Research AreasLaser-system designLasersPolaritonsSemiconductor lasersCondensed Matter, Materials & Applied PhysicsAtomic, Molecular & Optical
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