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Modes of empty off-axis unstable resonators with rectangular mirrors

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Abstract

The effect of Fresnel edge diffraction on mode loss and far-field beam quality is investigated for empty off-axis unstable resonators with rectangular mirrors. For the cases investigated, mode-loss separation and beam quality of the lowest-loss mode are maximized nonconcurrently when the optical axis intersects the small convex mirror near one of its corners rather than its center. Although these properties indicate that the near-corner off-axis resonator can achieve superior beam quality to that achieved by an on-axis resonator, it is also shown that a large instability in beam quality can occur near the operating point which gives maximum mode-loss separation and superior beam quality.

© 1979 Optical Society of America

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