Slight Deformation of Confocal Fabry-Perot Resonator

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Abstract
A tilt deformation of a confocal Fabry-Perot resonator is treated by the use of a perturbation method in solving the resonant integral equation based on the interferometer picture. The tilt of the confocal mirrors is considered as the off-axial shift of mirrors along the spherical surfaces. The diffraction loss in the presence of the tilt deformation is computed numerically for some values of the Fresnel number and the deformation parameter. It is shown that the loss of a confocal resonator is not so sensitive to the tilt of the mirror as a plane resonator is. The diffraction losses of some modes of the guided wave beams calculated by Gouban et al. are again obtained as our specific case of no deformation, which can be compared favorably with theirs.

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