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(Color) Schematic process flow for creation of solgel microcavities on a wafer (left) and photomicrograph plan view (right) after each step. (a) Sol–gel layer is spun on wafer; (b) circular pads are etched; (c) isotropic silicon etch; (d) laser reflow.
(Color) Typical laser spectrum of an -doped solgel silica microtoroid laser. The inset is a photomicrograph top view of an -doped solgel silica microtoroid laser with principal diameter of coupled by a fiber taper. The green ring is due to upconverted photoluminescence from .
(Color online) Measured laser output power plotted vs the absorbed pump power for a microtoroid laser with principal diameter of . The lasing threshold is with pump wavelength at and lasing wavelength at .
(Color online) Raman emission spectrum of an undoped microtoroid with principal diameter of . The pump wavelength is at and Raman oscillation occurs at . The inset shows the measured Raman laser output power vs the absorbed pump power.
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