Three-mirror aplanatic telescope with low diffraction sidelobes.
A three-mirror rotationally symmetric telescope has been designed in which the secondary and tertiary mirrors are behind the primary. In this configuration the mounting structure of the secondaries need not interrupt the light path, thus avoiding the production of undersirable diffraction sidelobes. In a 1° total field of view the image blur circle is less than 3 arcmin. The design has application in the millimeter and submillimeter wavelength regions for problems in which low response to far-off-axis sources is critical.
Gush
H P
HP