Abstract
I show that the solution of the electromagnetic equations for a loaded cavity with a large Fresnel number F (F > 100) can be obtained analytically. This asymptotic solution is obtained as a perturbation of the geometrical-optics solution, with edge-diffraction effects appearing as ripples of order 1/(F)1/2. The basic technique is to- obtain a series expansion of the relevant integrals in powers of 1/(F)1/2. This scheme works even better if the laser is operating in the saturated regime. This method of solution represents an extension of the method of Butts and Avizonis [ J. Opt. Soc. Am. 68, 1072 ( 1978)], which is applicable to empty, cylindrical, unstable resonators.
© 1991 Optical Society of America
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