title: Narrow linewidth Brillouin laser based on chalcogenide photonic chip.
abstract: 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.
authors.affiliation: Institute of Photonics and Optical Sciences (IPOS), School of Physics, University of Sydney, Sydney, NSW 2006, Australia. kabakova@physics.usyd.edu.au
authors.forename: Irina V
authors.initials: IV
authors.lastname: Kabakova
authors.forename: Ravi
authors.initials: R
authors.lastname: Pant
authors.forename: Duk-Yong
authors.initials: DY
authors.lastname: Choi
authors.forename: Sukhanta
authors.initials: S
authors.lastname: Debbarma
authors.forename: Barry
authors.initials: B
authors.lastname: Luther-Davies
authors.forename: Stephen J
authors.initials: SJ
authors.lastname: Madden
authors.forename: Benjamin J
authors.initials: BJ
authors.lastname: Eggleton