Optical: systems and elements – Optical modulator – Light wave directional modulation
Patent
1986-04-08
1993-05-04
Gregory, Bernarr E.
Optical: systems and elements
Optical modulator
Light wave directional modulation
359359, 359586, 359588, 359885, G02B 520
Patent
active
H00011827
ABSTRACT:
A novel optical filter structure for selectively blocking radiation of predetermined wavelength is described which comprises a plurality of alternate first and second layers deposited on a substantially transparent substrate, the first layers comprising a transparent nontransitioning material of first refractive index, the second layers comprising a material characterized by a transition from ferroelectric phase having second refractive index to nonferroelectric phase having third refractive index different from the first and second indices upon being heated to a characteristic transition temperature, each of the first and second layers having a thickness substantially equal to one-fourth times the ratio of the predetermined wavelength to the respective index of refraction.
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Gregory Bernarr E.
Scearce Bobby D.
Singer Donald J.
The United States of America as represented by the Secretary of
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