The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Feb. 19, 1991
Filed:
Sep. 15, 1988
Jonathan R Biles, Portland, OR (US);
Ho W Lo, Portland, OR (US);
Other;
Abstract
A polarization-selective holographic element having first and second holographic layers, each holographic layer including holograms comprising a plurality of fringes which are recorded with light having a first wavelength .lambda..sub.1. The holographic optical element transmits a first component of light having a second wavelength .lambda..sub.2 without diffraction and diffracts a second component of the light having the second wavelength by a selected angle. The holograms have a high diffraction efficiency and are recorded with beams making angles .sigma..sub.1 and .sigma..sub.2 with a normal to the surface of the holographic layers, where .vertline..theta..sub.2 -.theta..sub.1 .vertline.=.vertline..sigma..sub.2 -.sigma..sub.1 .vertline.=2.alpha., .lambda..sub.2 /(sin.theta..sub.1 +sin.theta..sub.2)=.lambda..sub.1 /(sin.theta..sub.1 +sin.theta..sub.2), and .theta..sub.1 and .theta..sub.2 are the incident and diffracted angles of the second component of the light having the second wavelength.