Abstract

A Yb-doped silica microcavity laser on a silicon chip is fabricated from a solgel thin film. The high-Q microtoroid cavity, which has a finesse of 10,000, is evanescently coupled to an optical fiber taper. We report a threshold of $1.8\mu \mathrm{W}$ absorbed power that is, to the best of our knowledge, the lowest published threshold to date for any Yb-doped laser. The effect of ${\mathrm{Yb}}^{3+}$ concentration on laser threshold is experimentally quantified.

© 2007 Optical Society of America

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