Abstract
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
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