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30 December 1981 Modes Of Unstable Ring Resonator With Self-Imaging Aperture
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Proceedings Volume 0288, Los Alamos Conf on Optics '81; (1981)
Event: Los Alamos Conference on Optics, 1981, Los Alamos, United States
In this paper we compare the converged solutions of infinite Fresnel number, negative branch unstable ring resonators of circular mirrors and apertures to the low-order symmetric and nonsymmetric geometric eigenmodes that one would expect in the limit where diffraction effects can be ignored. We use the fact that the equivalent collimated round-trip propagation length of a negative branch ring resonator can be zero under conditions that allow an aperture of the optical system to be imaged onto itself, i.e., to be self-imaged. Using a numerical resonator model, we show that for certain size spatial filters placed in the focal plane, the dominant ℓ = 0 and ℓ = 1 modes are given by the lowest order symmetric and nonsymmetric geometric modes, thus verifying the self-imaging aperture concept for resonators employing round optics. (Here, ℓ is the azimuthal mode index.) We present detailed results which show that a spatial filter may be used to stabilize modes over a wide range of eigenvalues in addition to those for which it is self-imaging.
© (1981) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Carl M. Wiggins "Modes Of Unstable Ring Resonator With Self-Imaging Aperture", Proc. SPIE 0288, Los Alamos Conf on Optics '81, (30 December 1981);


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