title: Low-Loss Modes and Resonances in a Quasi-90 degrees -Roof Mirror Resonator.
abstract: Modes and resonances of an open resonator formed by two roof mirrors with roof angle smaller than pi/2 are investigated. It is shown that modes exist that are limited by a caustic surface in such a way that they are exponentially low in the region of the edges of the mirrors, so that the diffraction at the edges can be neglected. Such modes and resonant frequencies are expressed in terms of modes and resonances of the flat-roof resonators.
authors.forename: L
authors.initials: L
authors.lastname: Ronchi