| US 7,450,231 B2 | ||
| Deviation angle self compensating substantially achromatic retarder | ||
| Blaine D. Johs, Lincoln, Nebr. (US); Steven E. Green, Lincoln, Nebr. (US); Craig M. Herzinger, Lincoln, Nebr. (US); and Duane E. Meyer, Lincoln, Nebr. (US) | ||
| Assigned to J.A. Woollam Co., Inc., Lincoln, Nebr. (US) | ||
| Filed on Dec. 04, 2006, as Appl. No. 11/633,138. | ||
| Application 11/633138 is a continuation in part of application No. 11/590408, filed on Oct. 31, 2006. | ||
| Claims priority of provisional application 60/733910, filed on Nov. 04, 2005. | ||
| Prior Publication US 2008/0100842 A1, May 01, 2008 | ||
| This patent is subject to a terminal disclaimer. | ||
| Int. Cl. G01J 4/00 (2006.01); G02B 5/30 (2006.01) | ||
| U.S. Cl. 356—365 [356/368; 359/496; 359/497; 359/494] | 18 Claims |
| 1. A system for introducing a relative phase retardation into orthogonally polarized components of an electromagnetic beam
entered thereinto, said system consisting of at least two sequential elements oriented with respect to one another such that
said entered electromagnetic beam undergoes total internal reflection at least once in each of the at least two elements;
the sequence, orientation, geometry, and symmetry of the elements being such that the output beam position is substantially
undeviated by a translation of the system, and the output beam angle is substantially undeviated by a rotation of the system.
|