Journal
OPTICS EXPRESS
Volume 23, Issue 2, Pages 1025-1034Publisher
OPTICAL SOC AMER
DOI: 10.1364/OE.23.001025
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Funding
- Karlsruhe School of Optics and Photonics (KSOP)
- 'Concept for the Future' of Karlsruhe Institute of Technology within the framework of the German Excellence Initiative
- Deutsche Forschungsgemeinschaft
- Open Access Publishing Fund of Karlsruhe Institute of Technology
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Lasing from whispering-gallery mode (WGM) resonators occurs omnidirectional in azimuthal plane. Most applications of WGM resonators require spectral analysis with off-chip detectors, where in-plane emission and beam divergence hinder efficient detection. We demonstrate redirecting WGM laser emission from all azimuthal angles using a circular micromirror placed around the cavity. By collecting reflections off the micromirror via free-space optics, read-out intensity improved by one order of magnitude. Blocking vertically emitted spontaneous emission and recording reflections off the micromirror only, signal-to-noise ratio improved from 4.6 dB to 15 dB. Our read-out concept may be applied to arbitrary WGM cavity geometries without deteriorating the cavity's quality factor. (C) 2014 Optical Society of America
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