Effects of Spatially Nonuniform Gain on Lasing Modes in Weakly Scattering Random Systems

Details Effects of Spatially Nonuniform Gain on Lasing Modes in Weakly Scattering Random Systems Effects of Spatially Nonuniform Gain on Lasing Modes in Weakly Scattering Random Systems

2009-10-28

arxiv.org/abs/0910.5285v1

Phys. Rev. A 81 (2010) 043818

Physics

Optics

26 pages, 10 figures (quality reduced for arXiv)

Scientific paper

10.1103/PhysRevA.81.043818

A study on the effects of optical gain nonuniformly distributed in one-dimensional random systems is presented. It is demonstrated numerically that even without gain saturation and mode competition, the spatial nonuniformity of gain can cause dramatic and complicated changes to lasing modes. Lasing modes are decomposed in terms of the quasi modes of the passive system to monitor the changes. As the gain distribution changes gradually from uniform to nonuniform, the amount of mode mixing increases. Furthermore, we investigate new lasing modes created by nonuniform gain distributions. We find that new lasing modes may disappear together with existing lasing modes, thereby causing fluctuations in the local density of lasing states.

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