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Published February 15, 2009 | Published
Journal Article Open

On-chip green silica upconversion microlaser


We demonstrate an erbium-doped silica toroidal microcavity upconversion laser on a silicon chip lasing in the visible spectral range (510-580 nm). The microcavity is pumped at 1458 nm by a tapered optical fiber coupled to the cavity and the lasing threshold is 690 µW. Lasing is observed at room temperature despite the high nonradiative relaxation rates of Er in pure silica that usually precludes upconversion. lasing from higher excited states. This is attributed to the very high circulating pump power in the high-Q microcavity (Q > 10^7).

Additional Information

© 2009 Optical Society of America. Received November 5, 2008; revised January 7, 2009; accepted January 8, 2009; posted January 15, 2009 (Doc. ID 103577); published February 11, 2009. The Dutch part of this work is part of the research program of the Foundation for Fundamental Research on Matter (FOM), the SmartMix program of the Dutch Ministry of Economic Affairs, and the Air Force of Scientific Research (AFOSR), Multidisciplinary University Research program (MURI) award FA9550-05-1-0450. The Caltech part of this work is supported in part by the Defense Advanced Research Projects Agency (DARPA) and the Caltech Lee Center. Tao Lu is partially financially supported by a Natural Sciences and Engineering Research Council of Canada (NSERC) postdoctoral fellowship. OCIS Codes: (140.3500) Lasers and laser optics : Lasers, erbium; (140.7300) Lasers and laser optics : Visible lasers; (140.3613) Lasers and laser optics : Lasers, upconversion

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