Tunable narrowband fiber laser with feedback based on whispering gallery mode resonances of a cylindrical microresonator.
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 maximum power of 0.380 mW with 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.
Departamento de Física Aplicada-ICMUV, Universidad de Valencia, Burjassot, Spain.
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E
Rivera-Pérez
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A
Díez
M V
MV
Andrés
J L
JL
Cruz
A
A
Rodríguez-Cobos