Coherent lasing of two lasers can be achieved passively by intracavity exchange of light between the lasers. Full coherence of the lasers typically implies synchronization in three parameters: frequency, phase, and polarization. Here we investigate a simple laser system in which exchange of light can cause a variety of states: full coherent lasing, only polarization-locked lasing, frequency-locked lasing without phase locking, and independent incoherent lasing. We demonstrate these states experimentally with evanescently coupled fiber lasers, and propose a simple model that offers a simple explanation for these intriguing observations.
© 2012 Optical Society of America
Lasers and Laser Optics
Original Manuscript: November 30, 2011
Revised Manuscript: March 13, 2012
Manuscript Accepted: March 19, 2012
Published: May 9, 2012
Eitan Ronen and Amiel A. Ishaaya, "Frequency, phase, and polarization locking of evanescently coupled lasers," J. Opt. Soc. Am. B 29, 1226-1230 (2012)