A stimulated radiation cavity reflector for achieving large mode diameters in a short resonant cavity with low output beam divergence and high stability. The reflector in its simplest form comprises a plano-concave substrate whose plane surface has a reflective coating deposited thereon and whose concave surface has an anti-reflective coating. The effects resulting from the use of such a back-surface positive mirror in a laser cavity is shown to be similar to the effects resulting from the use of a front-surface plano-convex negative mirror in the same cavity. The relationship of the radii of curvature of an equivalent back-surface positive mirror to a given negative mirror is described herein.
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