Tunable narrowband fiber laser with feedback based on whispering gallery mode resonances of a cylindrical microresonator
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Narrowband filtering based on whispering gallery modes of a slightly tapered cylindrical optical microresonator was used to implement a tunable narrowband erbium-doped fiber laser. The laser can be set to emit a single longitudinal cavity mode (single frequency), although the laser cavity is a few meters long. In the single-frequency regime the laser can emit a maximumpower of 0.380mWwith a linewidth <35 kHz and a signal-to-noise ratio exceeding 50 dB. Tunability is achieved by sliding the excitation point along the microcylinder. A tuning range of 1.16 nm is demonstrated. © 2013 Optical Society of America.
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Erbium doped fiber laser; Excitation points; Feed-back based; Longitudinal cavity modes; Micro cylinders; Micro resonators; Narrowband fiber laser; Single frequency; Fiber lasers; Whispering gallery modes; Resonators
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