Abstract
At the present time two methods are utilized to discriminate against off-axis modes in open resonators. In the first and most widespread of these methods the spatial structure of the wave beam is limited by means of absorbing irises [I, 2], while in the second it is the angula~ spectrum of the beam that is limited (by means of a totally reflecting prism, for example [3]). In the present note we compare the characteristics of both methods and indicate the possibility of combining them to thin out the spectrum of optical resonators with broad beams. For simplicity let us consider an open two-dimensional resonator of length L with identical cylindrical mirrors of radius 2F. All the results can readily be generalized to the case of a resonator with spherical mirrors. The equation for the field distribution on the mirrors when they are bounded by identical irises with a transmittance t(x) has the form
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