We present, to the best of our knowledge, the first demonstration of a narrow linewidth, waveguide-based Brillouin laser that is enabled by large Brillouin gain of a chalcogenide chip. The waveguides are equipped with vertical tapers for low-loss coupling. Due to optical feedback for the Stokes wave, the lasing threshold is reduced to 360 mW, which is five times lower than the calculated single-pass Brillouin threshold for the same waveguide. The slope efficiency of the laser is found to be 30%, and the linewidth of 100 kHz is measured using a self-heterodyne method.
© 2013 Optical Society of America
Lasers and Laser Optics
Original Manuscript: May 20, 2013
Revised Manuscript: July 2, 2013
Manuscript Accepted: July 23, 2013
Published: August 19, 2013
Irina V. Kabakova, Ravi Pant, Duk-Yong Choi, Sukhanta Debbarma, Barry Luther-Davies, Stephen J. Madden, and Benjamin J. Eggleton, "Narrow linewidth Brillouin laser based on chalcogenide photonic chip," Opt. Lett. 38, 3208-3211 (2013)