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(Main Talk)

A traditional laser uses an optical cavity to provide coherent feedback into the gain medium, allowing for the saturation of gain. Random lasers work in much the same way, except they use elastic scattering to provide incoherent feedback. We propose that the same can be achieved using inelastic Raman scattering to create a random Raman laser.

We will present preliminary experimental results that show stimulated Raman scattering is present, which is of course the first ingredient needed for random Raman lasing. We have also developed a Monte Carlo type model for stimulated Raman scattering which suggests that shorter photon mean free paths lead to a kind of inelastic slow light effect when the pulse enters the random medium. This is because the diffusive speed of the light through the random medium is much slower than the speed of light in the vacuum, causing the pulse to bunch up at the front of the sample, creating a region that appears promising for random Raman lasing.

Thursday, January 31, 2013
IQSE 578, 12:30 noon
Mitchell Physics Building

Department of Physics and Astronomy
Institute for Quantum Science and Engineering
Texas A&M University

(The usual pizza lunch. Newcomers are always welcome!)

Host: Andrew Traverso