WIDE FIELD FOUR MIRROR TELESCOPE USING OFF-AXIS ASPHERICAL MIRRORS

摘要

A telescope comprising: an entrance pupil region; a first concave mirror (M1) belonging to a first rotationally symmetric aspheric surface (1) and reflecting light passing through the entrance pupil region; a second convey mirror (M2) belonging to a second rotationally symmetric aspheric surface (2) and reflecting light reflected by the first mirror; a third convex mirror (M3) belonging to a third rotationally symmetric aspheric surface (4) and reflecting light reflected by the second mirror to an exit pupil (6); the first, second third and fourth rotationally symmetric aspheric surfaces being centered on the symmetry axis (Oz) of the third mirror, the first second and fourth mirrors being centered along a first direction (x) perpendicular to the optical axis and off-centered in a second direction (y) perpendicular to the symmetry axis and to the first direction.