We have studied both experimentally and numerically the dynamic effect of nonlinearity on lasing in disordered medium. The third-order nonlinearity not only changes the frequency and size of lasing modes, but also modifies the laser emission intensity and laser pulse width. When the nonlinear response time is longer than the lifetime of the lasing mode, the nonlinearity changes the laser output through modifying the size of the lasing mode. When the nonlinear response is faster than the buildup of the lasing mode, positive nonlinearity always extracts more laser emission from the random medium due to the enhancement of single particle scattering.
B. Liu et al., "Dynamic Nonlinear Effect on Lasing in a Random Medium," Physical Review Letters, vol. 91, no. 6, pp. 063903/1-063903/4, American Physical Society (APS), Aug 2003.
The definitive version is available at http://dx.doi.org/10.1103/PhysRevLett.91.063903
Keywords and Phrases
Computer Simulation; Dyes; Laser Applications; Laser Pulses; Light Emission; Light Scattering; Mathematical Models; Nanostructured Materials; Particles (Particulate Matter); Polymethyl Methacrylates; Titanium Dioxide; Dynamic Nonlinear Effect; Laser Emission Intensity; Lasing; Lasing Mode; Random Medium; Single Particle Scattering; Nonlinear Optics
International Standard Serial Number (ISSN)
Article - Journal
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