Abstract

The past dozen years have seen several important publications on mode coupling losses in circular and rectangular waveguide lasers. It is frequently assumed that the laser mode is pure EH11 (quasi-TEM00). We note a flaw in the widely quoted Laguerre-Gaussian mode expansion method as it originally appeared and show how to reconcile it with later results. Also we summarize and try to remove several discrepancies in the published accounts of how the EH11 loss behaves for the popular near-Case I reflector (i.e., a plane mirror placed within a few guide widths of the guide aperture).

© 1985 Optical Society of America

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