Grating integrated single mode microring laser
Microring and microdisk lasers are potential candidates for small footprint, low threshold in-plane integrated lasers; however, they exhibit multimode lasing spectra and bistability. Here, we theoretically propose and experimentally demonstrate a novel approach for achieving single mode lasing in microring lasers. Our approach is based on increasing the radiation loss of all but one of the resonant modes of microring resonators by integrating second order gratings on the microrings' waveguide. We present single mode operation of electrically pumped semiconductor microring lasers whose lasing modes are lithographically selected via the second order grating. We also show that adding the grating does not increase the lasing threshold current significantly.
© 2015 Optical Society of America. Received 26 Dec 2014; revised 6 Feb 2015; accepted 6 Feb 2015; published 20 Feb 2015. This work was supported by the National Science Foundation (CAREER award ECCS-1055941).
Published - oe-23-4-5335.pdf