Phase locking of two coupled lasers with many longitudinal modes.
Detailed experimental and theoretical investigations of two coupled fiber lasers, each with many longitudinal modes, reveal that the behavior of the longitudinal modes depends on both the coupling strength and the detuning between them. For low to moderate coupling strength only longitudinal modes that are common for both lasers phase lock, while those that are not common gradually disappear. For larger coupling strengths, the longitudinal modes that are not common reappear and phase lock. When the coupling strength approaches unity the coupled lasers behave as a single long cavity with correspondingly denser longitudinal modes. Finally, we show that the gradual increase in phase locking as a function of the coupling strength results from competition between phase-locked and non-phase-locked longitudinal modes.
Fridman
Moti
M
Department of Physics of Complex Systems, Weizmann Institute of Science, Rehovot 76100, Israel. fefridma@wisemail.weizmann.ac.il
Nixon
Micha
M
Ronen
Eitan
E
Friesem
Asher A
AA
Davidson
Nir
N