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Directional random-laser emission from Bragg gratings with irregular perturbation
Qinghai Song1, Liying Liu, Lei Xu
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
Optics Letters
|February 3, 2009
Summary
Researchers observed both band-edge and random laser actions in an organic-inorganic grating. Random lasers can operate with thresholds similar to band-edge lasers, demonstrating efficient performance.
Area of Science:
- Materials Science
- Optics and Photonics
- Condensed Matter Physics
Background:
- Organic-inorganic hybrid materials offer unique optoelectronic properties.
- Random lasers provide a potential pathway for low-threshold coherent light sources.
- Grating structures can control light emission properties.
Purpose of the Study:
- To investigate laser actions in an active organic-inorganic grating with irregular perturbations.
- To compare the laser thresholds of band-edge emission and random laser emission.
- To analyze the emission characteristics, including directionality and divergence.
Main Methods:
- Fabrication of an active organic-inorganic grating structure.
- Optical excitation experiments to induce laser actions.
- Spectroscopic analysis to observe band-edge and random laser emissions.
- Measurement of laser thresholds and emission divergence angles.
Main Results:
- Both band-edge and random laser emissions were successfully observed.
- The laser thresholds for band-edge and random laser actions were found to be very close.
- The grating structure enabled directional emission with a narrow divergence angle.
Conclusions:
- Random lasers can exhibit thresholds comparable to conventional band-edge lasers.
- Organic-inorganic gratings are promising for achieving efficient and directional laser emission.
- Irregular perturbations in the grating do not preclude effective laser operation.
