An intuitive technique has been developed in which the lowest- and the higher-order modes for unstable resonators having rectangular or circular mirrors are derived. Instead of two mirrors, it considers the resonator to consist of a train of diffractive edges that are virtual images of the edge of the feedback mirror. Circular-mirror unstable resonators are shown not to exhibit the exact geometrical mode even at high Fresnel numbers.
No takes yet. Share an insight, caveat, or question.
W. H. Southwell (1986) studied this question.
Synapse has enriched 5 closely related papers on similar clinical questions. Consider them for comparative context: