| US 7,554,728 B1 | ||
| Modified gregorian astronomical telescope | ||
| Mark R. Ackermann, Albuquerque, N. Mex. (US) | ||
| Assigned to The United States of America as represented by the Secretary of the Air Force, Washington, D.C. (US) | ||
| Filed on Sep. 15, 2006, as Appl. No. 11/527,663. | ||
| Int. Cl. G02B 23/06 (2006.01) | ||
| U.S. Cl. 359—399 [359/365] | 2 Claims |
| 1. A modified Gregorian telescope, comprising:
a primary mirror having an aspheric surface for reflecting incoming electromagnetic radiation;
a secondary mirror, positioned along the same axis as said primary mirror to receive the electromagnetic radiation reflected
by said primary mirror, having a spherical surface for further reflecting the electromagnetic radiation to a focal plane;
and
at least three inter-focal lenses positioned within the inter-focal region.
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