Polarizing beam splitting phase transition optical modulator

Details Polarizing beam splitting phase transition optical modulator Polarizing beam splitting phase transition optical modulator

1978-12-12

1983-02-08

Punter, William H.

350395, G02F 119, G02B 530

Patent

active

043726534

ABSTRACT:
A polarizing modulator of luminous energy which relies upon the rapid phase transition characteristics of compounds from the group consisting of VO, VO.sub.2, V.sub.2 O.sub.3, V.sub.3 O.sub.5, V.sub.4 O.sub.7, V.sub.5 O.sub.9, V.sub.6 O.sub.11, V.sub.7 O.sub.13, V.sub.8 O.sub.15, Ti.sub.2 O.sub.3, Ti.sub.4 O.sub.7, NbO.sub.2, FeSi.sub.2, VO.sub.2 NbO.sub.2, V.sub.1--x Mo.sub.x O.sub.2, VO.sub.2 -TiO.sub.2, V.sub.2 O.sub.3 -Ti.sub.2 O.sub.3, V.sub.1-x Ge.sub.x O.sub.2, V.sub.1-x Nb.sub.x O.sub.2, V.sub.1-x Cr.sub.x O.sub.2, (Cr.sub.x V.sub.1-x).sub.2 O.sub.3 and V.sub.1-x Ti.sub.x O.sub.2 to controllably vary the luminous energy output beam between unpolarized and polarized states. An unpolarized beam is projected onto a substantially flat surface of a crystal or layered thin film structure fabricated with a compound from the above-defined group. The angle of incidence is so oriented as to form Brewster's angle with respect to the beam. When the compound of transitional material is stimulated into its transmissive (non-metallic) state, the reflected portion of the incident luminous energy beam is polarized. In the alternate, when the transitional compound is stimulated into its reflective (metallic) state, all polarizations of the incident beam are reflected. Controlled modulation of the transition material state is effected by stimuli such as electric field, thermal energy or hydrostatic pressure.

REFERENCES:
patent: Re28199 (1974-10-01), Deb et al.
patent: 3021754 (1962-02-01), Ross
patent: 3439974 (1969-04-01), Henry et al.
patent: 3578843 (1971-05-01), Castellion
patent: 3971874 (1976-07-01), Ohta et al.

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