Polarisation recuperation system

Details Polarisation recuperation system Polarisation recuperation system

2005-11-30

2009-02-24

Allen, Stephone B. (Department: 2872)

Optical: systems and elements

Polarization without modulation

By relatively adjustable superimposed or in series polarizers

C362S019000, C353S020000, C359S490020

Reexamination Certificate

active

07495830

ABSTRACT:
A polariser or a system for lighting using such a polariser in a polarisation recuperation system. The polariser comprises first and second polarising beam splitters (212a,212b) for splitting first and second unpolarised beams each into at least first and second polarised beams of different polarisation states. The first and second polarised beams are guided to first and second light paths respectively. On these light paths controllable polarisation conversion elements (218a,218b) are arranged such that the second polarised beam from the first unpolarised beam time-shares a same path through the polarisation conversion element (218a,218b) as the first polarised beam from the second unpolarised beam. The controllable polarisation conversion elements are switchable to alternately convert and not convert the polarisation state, depending on which beam is switched to pass through the polarisation conversion elements (218a,218b), corresponding with which of the first or second unpolarised beams are present.

REFERENCES:
patent: 5381250 (1995-01-01), Meadows
patent: 6049404 (2000-04-01), Wu et al.
patent: 2003-295315 (2003-10-01), None
Patent Abstracts of Japan, vol. 018, No. 306 (P-1752), Jun. 10, 1994 & JP 06 067220 A (Nippon Telegr & Teleph Corp <NTT>), Mar. 11, 1994 *abstract*.

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