کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
1543338 | 1512836 | 2012 | 7 صفحه PDF | دانلود رایگان |

We investigate diffusive propagation of light and consequent random lasing in an amplifying medium comprising resonant spherical scatterers. A Monte-Carlo calculation based on photon propagation via three-dimensional random walks is employed to obtain the dwell-times of light in the system. We compare the inter-scatterer and intra-scatterer dwell-times for representative resonant and non-resonant wavelengths. Our results show that more efficient random lasing, with intense coherent modes, is obtained for a system with intra-scatterer gain. This is also coupled with a larger reduction in frequency fluctuations. We find that such a system can yield almost thresholdless random lasing. Inspired by these results, we discuss a possible practical situation, based on a monodisperse aerosol, wherein frequency controlled coherent random lasing can be obtained. Since our analysis essentially investigates transport of intensity, the results are relevant to coherent random lasers under nonresonant feedback.
► Resonant diffusive media with intra-scatterer gain yield more efficient coherent random lasing.
► Almost thresholdless random lasing can be obtained.
► Frequency fluctuations can be reduced in such systems.
► An aerosol-based random laser can be a practical implementation.
Journal: Photonics and Nanostructures - Fundamentals and Applications - Volume 10, Issue 4, October 2012, Pages 416–422