Abstract
Modes, losses, and phase shift are determined for an open resonator formed by two equal and symmetric roof mirrors with roof angle α ranging from −8° to 100°. In all cases, the Fresnel number of the resonator was N = 1 and the mirror spacing L = 100λ. The results of the numerical analysis show two stability regions that correspond to quasi-flat-roof resonators and to quasi-90° roof resonators, respectively. The equivalence between a resonator with a small roof angle α (quasi-flat roof) and a resonator with roof angle (π + α)/2 is discussed. A quasi-90° roof resonator presents losses generally smaller than the equivalent flat-roof resonator.
© 1975 Optical Society of America
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