Optical: systems and elements – Diffraction – From grating
Patent
1994-06-29
1998-02-03
Callahan, Timothy P.
Optical: systems and elements
Diffraction
From grating
359332, 359576, 385 37, G02F 137
Patent
active
057150923
ABSTRACT:
A ferroelectric light frequency doubler device has a surface coating on one surface of an initially uniformly poled ferroelectric crystal, the surface coating on the one surface being exposed to a scanning electron beam so as to form a spatially periodically alternating polarity domain structure in the crystal. The surface coating can be of an inorganic material or it can be of a polymeric organic material. The surface coating can be adapted to be patterned to form an optical grating in registrative alignment with the spatially periodically alternating polarity domain structure when such optical grating is desired. Alternatively, the surface coating may remain on the device as a protective coating, or it may be removed upon formation of the alternating polarity domain structure in the crystal. When the surface coating is adapted to be responsive to the scanning electron beam, the spatially periodically alternating domains in the ferroelectric crystal and a latent optical grating pattern in the surface coating are established at the same time by the electron beam. The latent optical grating pattern can be formed into an optical grating during a subsequent pattern development step.
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Gupta Mool C.
Nutt Alan C. G.
Callahan Timothy P.
Eastman Kodak Company
Owens Raymond L.
Wells Kenenth B.
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