Title:
WIDE-ANGLE RUGATE POLARIZING BEAMSPLITTER
Document Type and Number:
WIPO Patent Application WO2002027385
Kind Code:
A3
Abstract:
A polarizing beamsplitter includes an optical medium and a rugate filter embedded therein. The rugate filter has an average refractive index which varies with position on the rugate plane in the non-thickness direction, where the averaging is across the rugate film in the thickness direction. The variation in the rugate's average index compensates for variations in incident angle across a cone of a divergent light beam. In one embodiment, the period of the rugate is substantially constant across its surface. Most preferably, the amplitude of the rugate index variation has an apodizing amplitude envelope superimposed thereom to aid in coupling the rugate to a surrounding optical medium.
Inventors:
SOUTHWELL WILLIAM H
Application Number:
PCT/US2001/029930
Publication Date:
December 24, 2003
Filing Date:
September 20, 2001
Export Citation:
Assignee:
INNOVATIVE TECH LICENSING LLC (US)
International Classes:
G02B5/28; G02B5/30; G02B27/14; (IPC1-7): G02B27/28; G02B5/28; G02B27/14
Foreign References:
| US4545646A | 1985-10-08 | |||
| US5828489A | 1998-10-27 |
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