Effect of local pumping on random laser modes
arXiv:physics/0701193 · doi:10.1364/JOSAB.24.000A26
Abstract
We have developed a numerical method based on the transfer matrix to calculate the quasimodes and lasing modes in one-dimensional random systems. Depending on the relative magnitude of the localization length versus the system size, there are two regimes in which the quasimodes are distinct in spatial profile and frequency distribution. In the presence of uniform gain, the lasing modes have one-to-one correspondence to the quasimodes in both regimes. Local excitation may enhance the weight of a mode within the gain region due to local amplification, especially in a weakly scattering system.
8 pages, 5 figures
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- Statistical studies of random lasing modes and amplified spontaneous emission spikes in weakly scattering systems
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- Supersymmetry-guided method for mode selection and optimization in coupled systems
- Creation of New Lasing Modes with Spatially Nonuniform Gain
- Minimum reflection channel in amplifying random media
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- Selective Pumping of Localized States in a Disordered Active Medium
- Nonlinear Spatial Focusing in Random Layered Media by Spectral Pulse Shaping