title: Beam pathlength multiplication.
abstract: The reflected beam pattern within a beam path multiplier (BPM) formed by two roof reflectors is described in detail. Multiple reflections produced by both translation and rotation of the ridge of one reflector with respect to the other are described in a Cartesian tensor formulation. Equations are derived that describe the spatial distribution of the reflected beams in a BPM of this type under static and dynamic conditions.
authors.forename: G D
authors.initials: GD
authors.lastname: Chapman