2-D Excitonic Laser (IMAGE) DOE/Lawrence Berkeley National Laboratory Caption In the whispering gallery mode of a 2-D excitonic laser made from a monolayer of tungsten disulfide and a microdisk resonator, the localization of the electric field at the edges of the resonator helps promote a high Q factor with low power consumption. Credit Xiang Zhang, Berkeley Lab Usage Restrictions None License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.