Intense directional light emission from a deformed square-shaped organic light-emitting microring cavity was observed. The ring cavity was a dye-doped organic–inorganic hybrid glass film coated upon a square-shaped fiber. From the near-field and far-field emission patterns and their emission spectra we found, for the first time to our knowledge, the simultaneous existence of chaotic whispering-gallery modes and four-bounce reflection modes. The two types of mode have different emission directions, different lasing thresholds, and different spectral linewidths. High-contrast angle-modulated light emission was also observed. We could control modulation and angular spread of emission by controlling the deformation of the cavity.
© 2003 Optical Society of America
(140.1540) Lasers and laser optics : Chaos
(140.3410) Lasers and laser optics : Laser resonators
(160.6060) Materials : Solgel
(230.3990) Optical devices : Micro-optical devices
(260.5740) Physical optics : Resonance
Tao Ling, Liying Liu, Qinghai Song, Lei Xu, and Wencheng Wang, "Intense directional lasing from a deformed square-shaped organic-inorganic hybrid glass microring cavity," Opt. Lett. 28, 1784-1786 (2003)