Abstract

We demonstrate that the transverse eigenmodes in a waveguide that combines a parabolic index guide with a Gaussian gain guide can be highly nonorthogonal. The excess-noise factor K that arises from this nonorthogonality exhibits resonant features with maximum values that can easily reach K400. This simple model applies directly to stable-cavity microchip lasers with focused gain.

© 2001 Optical Society of America

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