Interaction-induced mode switching in steady-state microlasers

• Main Authors: Ge, Li (Author), Cerjan, Alexander (Author), Rotter, Stefan (Author), Cao, Hui (Author), Türeci, Hakan E. (Author), Stone, A. Douglas (Author), Liu, David (Contributor), Johnson, Steven G (Contributor)
• Other Authors: Massachusetts Institute of Technology. Department of Mathematics (Contributor), Massachusetts Institute of Technology. Department of Physics (Contributor)
• Format: Article
• Language: English
• Published: Optical Society of America, 2017-06-23T13:46:30Z.
• Subjects: Article
• Online Access: Get fulltext

We demonstrate that due to strong modal interactions through cross-gain saturation, the onset of a new lasing mode can switch off an existing mode via a negative power slope. In this process of interaction-induced mode switching (IMS) the two involved modes maintain their identities, i.e. they do not change their spatial field patterns or lasing frequencies. For a fixed pump profile, a simple analytic criterion for the occurrence of IMS is given in terms of their self- and cross-interaction coefficients and non-interacting thresholds, which is verified for the example of a two-dimensional microdisk laser. When the spatial pump profile is varied as the pump power is increased, IMS can be induced even when it would not occur with a fixed pump profile, as we show for two coupled laser cavities. Our findings apply to steady-state lasing and are hence different from dynamical mode switching or hopping. IMS may have potential applications in robust and flexible all-optical switching.
United States. Air Force. Office of Scientific Research. Multidisciplinary University Research Initiative (Grant FA9550-09-1-0704)
Massachusetts Institute of Technology. Institute for Soldier Nanotechnologies (Grant W911NF-07-D-0004)