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On-chip green silica upconversion microlaser

2009; Optica Publishing Group; Volume: 34; Issue: 4 Linguagem: Inglês

10.1364/ol.34.000482

1539-4794

Tao Lü, Lan Yang, R.V.A. van Loon, Albert Polman, Kerry J. Vahala,

Photorefractive and Nonlinear Optics

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 muW. 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)).