The eigenvalues for all the significant low-order resonant modes of an unstable
optical resonator with circular mirrors are computed using an eigenvalue method
called the Prony method. A general equivalence relation is also given, by means
of which one can obtain the design parameters for a single-ended unstable
resonator of the type usually employed in practical lasers, from the calculated
or tabulated values for an equivalent symmetric or double-ended unstable
© 1970 Optical Society of America
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