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Opt Lett. 2009 Feb 1;34(3):344-6.

Directional random-laser emission from Bragg gratings with irregular perturbation.

Author information

  • 1State Key Lab for Advanced Photonic Materials and Devices, Department of Optical Science and Engineering, School of Information Science and Engineering, Fudan University, Shanghai, China. qinghai.song@yale.edu

Abstract

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.

PMID:
19183653
[PubMed]
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