کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
1543338 1512836 2012 7 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Frequency behavior of coherent random lasing in diffusive resonant media
موضوعات مرتبط
مهندسی و علوم پایه مهندسی مواد مواد الکترونیکی، نوری و مغناطیسی
پیش نمایش صفحه اول مقاله
Frequency behavior of coherent random lasing in diffusive resonant media
چکیده انگلیسی

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.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Photonics and Nanostructures - Fundamentals and Applications - Volume 10, Issue 4, October 2012, Pages 416–422
نویسندگان
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