Abstract
In this work, a -doped solgel silica microsphere lasing at 2.0 μm is reported. Microspheres with different concentrations are fabricated by overlaying different concentration solgel solutions on the surface of a pure silica microsphere resonator and then annealing the sample with a laser. Based on a traditional fiber taper–microsphere coupling method, single and multimode microsphere lasing in the wavelength range 1.8–2.0 μm is observed if an 808 nm laser diode is used as a pump source. A relatively low threshold pumping power of 1.2 mW is achieved using this arrangement. This solgel method allows for an easy varying of the doping concentration. The observed laser output shifts to longer wavelengths when the doping concentration increases. This has been explained by the larger Tm absorption at shorter wavelengths. The ability to fabricate solgel co-doped silica glass microlasers represents a new generation of low threshold and compact infrared laser sources for use as miniaturized photonic components for a wide range of applications, including gas sensing and medical surgery.
© 2018 Optical Society of America
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