Here we report the laser actions inside an active organic–inorganic grating with some irregular perturbation. In an optical excitation experiment, band-edge and random-laser emissions were both observed. The laser thresholds of the two laser actions are very close, which shows that random laser sometimes can operate with a threshold comparable to band-edge emission. Owing to the diffraction of the grating, directional emission with a narrow divergence angle was also obtained.
© 2009 Optical Society of America
Original Manuscript: August 13, 2008
Revised Manuscript: December 11, 2008
Manuscript Accepted: December 12, 2008
Published: January 28, 2009
Qinghai Song, Liying Liu, and Lei Xu, "Directional random-laser emission from Bragg gratings with irregular perturbation," Opt. Lett. 34, 344-346 (2009)