An Yb3+-Ho3+Codoped Glass Microsphere Laser in the$2.0~mu$m Wavelength Regions

摘要

In this letter, an Ybn^{3+n-Hon3+ncodoped sol-gel silica microsphere lasing at around 2.0 μm is reported. The gain microsphere is fabricated by overlaying the 1.0 mol% Ybn3+n-0.2 mol% Hon3+ncodoped sol-gel solution on the surface of a pure silica microsphere and is then heated using a COn₂nlaser. Using a traditional fiber taper-microsphere coupling method, we observe the single- and multi-mode microsphere laser outputs around 2.0 μm using a 980 nm laser diode as a pump source, with a low threshold pumping power of 14.7 mW. The ability to fabricate sol-gel codoped silica glass microlasers represents a new generation of low-threshold and compact mid-infrared laser sources for use as miniaturized photonic components for a wide range of applications including gas sensing and medical surgery.}