Frequency behavior of coherent random lasing in diffusive resonant media |
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Authors: | Anjani Kumar Tiwari Ravitej Uppu Sushil Mujumdar |
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Affiliation: | Nano-optics and Mesoscopic Optics Laboratory, Tata Institute of Fundamental Research, Homi Bhabha Road, Mumbai 400005 India |
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Abstract: | 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. |
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