Abstract
A kind of whispering-gallery-mode (WGM) microcavities has been fabricated by melting a corroded erbium-doped fiber with a fiber-fusion splicer. The quality factor (Q) value of the microcavity can reach as high as $3\times 10^{7}$ . The microcavity is pumped by a wavelength-tunable laser source, and due to the high-Q characteristics, the laser threshold can be as low as 21.2 $\mu \text{W}$ in a 60- $\mu \text{m}$ -diameter microsphere-like cavity. By tuning the frequency of the pump laser at 1485 nm with 19.6 GHz, we can tune the WGM microcavity laser by 17.3 GHz around 1578.25 nm.
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