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Tunable erbium-doped microbubble laser fabricated by sol-gel coating

2017; Optica Publishing Group; Volume: 25; Issue: 2 Linguagem: Inglês

10.1364/oe.25.001308

1094-4087

Yong Yang, Fuchuan Lei, Sho Kasumie, Linhua Xu, Jonathan M. Ward, Lan Yang, Síle Nic Chormaic,

Advanced Fiber Laser Technologies

In this work, we show that the application of a sol-gel coating renders a microbubble whispering gallery resonator into an active device. During the fabrication of the resonator, a thin layer of erbium-doped sol-gel is applied to a tapered microcapillary, then a microbubble with a wall thickness of 1.3 μm is formed with the rare earth ions diffused into its wall. The doped microbubble is pumped at 980 nm and lases in the emission band of the Er3+ ions at 1535 nm. The laser wavelength can be shifted by aerostatic pressure tuning of the whispering gallery modes of the microbubble. Up to 240 pm tuning is observed with 2 bar of applied pressure. We also show that the doped microbubble could be used as a compact, tunable laser source.