APPLICATION OF A TWIN-CORE FIBER WITH MODE COUPLING BETWEEN THE CORES FOR THE NARROW-LINEWIDTH ERBIUM LASER IMPLEMENTATION
K. V. Proskurina1, M. I. Skvortsov1, E. V. Golikov1, S. R. Abdullina1, A. V. Dostovalov1, O. N. Egorova2, S. L. Semenov2, S. A. Babin1
1Institute of Automation and Electrometry, Siberian Branch, Russian Academy of Sciences, Novosibirsk, Russia
2Prokhorov General Physics Institute, Russian Academy of Sciences, Fiber Optics Research Center, Russian Academy of Sciences, Moscow, Russia
Keywords: single-frequency fiber lasers, fiber Bragg grating, random distributed feedback, erbium fiber
Abstract
Here we present an erbium fiber laser in a configuration of a half-open cavity formed by a narrow-linewidth fiber Bragg grating and artificial Rayleigh reflector provided random distributed feedback. For additional spectral filtering, a 10-m twin-core fiber wound on a spool with a diameter of 9 cm is used. A single-frequency generation regime with the maximum output power of 4.4 mW is demonstrated, and the generation linewidth is 2 kHz.
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