Apparatus for polarization conversion

Details Apparatus for polarization conversion Apparatus for polarization conversion

1998-06-29

2000-05-16

Schuberg, Darren E.

Optical: systems and elements

Polarization without modulation

Polarization by reflection or refraction

359487, 362 19, G02B 530

Patent

active

060645237

ABSTRACT:
An apparatus for polarization conversion having a light source for supplying vertically and horizontally linearly polarized light to an optical path and a parabolic mirror disposed in the optical path and proximate to the light source. In different embodiments, the parabolic mirror has a mirror coating to induce a phase shift of 0.degree., 90.degree., or an arbitrary phase shift between incident light and reflected light. A polarizer, preferably a reflective polarizer film, is disposed in the optical path for reflecting light of one of the linear polarizations and for transmitting the other linear polarization. Lastly, one or more waveplates are disposed in the optical path between the polarizer and the parabolic mirror. The waveplates have opposing segments each having axes which are antiparallel to each other for recycling the reflected linear polarization by converting it to the transmitted polarization.

REFERENCES:
patent: 3566099 (1971-02-01), Makas
patent: 3631288 (1971-12-01), Rogers
patent: 5381278 (1995-01-01), Shingaki et al.
patent: 5452128 (1995-09-01), Kimura
patent: 5535054 (1996-07-01), Shibuya

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