Abstract
A tunable fiber laser based on a high-quality-factor (high-Q) hybrid microcavity (HM) is proposed and demonstrated. As far as we know, this is the first report of fabricating the HM by coating TiO2 film with varied thickness on the SiO2 microsphere surface by atomic layer deposition technique, with the Q-factor maintained to be above 107. Ultra-narrow bandwidth whispering gallery mode spectrum of the HM is used for mode-selection in a double-ring fiber cavity, achieving tunable single-wavelength fiber laser output with 3dB bandwidth of about 16.20 pm, signal-to-noise ratio of ∼40 dB and wavelength tuning range of ∼220 pm. The proposed novel tunable, single-wavelength fiber laser with wide tuning range and high compactness can be potentially used for optical communication and sensing applications. © 2022 Optica Publishing Group.
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