With simple optical geometries a separate resonant Fabry–Perot cavity can serve as an optical feedback element that forces a semiconductor laser automatically to lock its frequency optically to the cavity resonance. This method is used to stabilize laser frequencies and reduce linewidths by a factor of 1000 from 20 MHz to approximately 20 kHz.
© 1987 Optical Society of America
Original Manuscript: May 20, 1987
Manuscript Accepted: August 12, 1987
Published: November 1, 1987
B. Dahmani, L. Hollberg, and R. Drullinger, "Frequency stabilization of semiconductor lasers by resonant optical feedback," Opt. Lett. 12, 876-878 (1987)