Creation of New Lasing Modes with Spatially Nonuniform Gain

Abstract

We report on the creation of new lasing modes with spatially nonuniform distributions of optical gain in a one-dimensional random structure. It is demonstrated numerically that even without gain saturation and mode competition, the spatial nonuniformity of gain can cause dramatic and complicated changes of lasing modes. New modes appear with frequencies in between those of the lasing modes with uniform gain. We examine some new lasing modes in detail and find they exhibit high output directionality. Our results show that the random lasing properties may be modified significantly without changing the underlying structures.

9 pages, 3 figures

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Cited by in corpus (6)

• Taming random lasers through active spatial control of the pump
• Unconventional modes in lasers with spatially varying gain and loss
• Quantum noise and mode nonorthogonality in nonhermitian PT-symmetric optical resonators
• Effects of Spatially Nonuniform Gain on Lasing Modes in Weakly Scattering Random Systems
• Steady-state ab initio laser theory for complex gain media
• Nonlinear effects in random lasers