A passive subring cavity that served as mode selector was inserted into a semiconductor fiber ring laser to generate a stable lasing spectrum. A narrow linewidth of less than 10 kHz with unidirectional operation in the composite cavity ring laser was achieved. Tuning over a range of 20 nm was obtained by application of 0–30 V dc to a piezoelectric transducer in the subring cavity.
© 2000 Optical Society of America
(140.3280) Lasers and laser optics : Laser amplifiers
(140.3510) Lasers and laser optics : Lasers, fiber
(140.3560) Lasers and laser optics : Lasers, ring
(140.3600) Lasers and laser optics : Lasers, tunable
Zhaoyang Hu, Ludi Zheng, Yanshen Zhang, and Quan'an Tang, "Composite cavity semiconductor fiber ring laser," Opt. Lett. 25, 469-471 (2000)