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

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

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  • 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.


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.

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