Optical waveguides – Having nonlinear property
Patent
1996-07-24
1998-03-31
Ngo, John
Optical waveguides
Having nonlinear property
385122, 385 10, 385 37, G02B 610
Patent
active
057347727
ABSTRACT:
Ferroelectric domain regions are formed in a ferroelectric crystal cut so that the polarization direction is in the plane of the crystal and is along the z direction is disclosed. A periodic ion exchange grating on the surface of the crystal with grating is provided on the surface of the crystal with grating lines parallel to the Z-axis of the crystal by a combination of photolithography and ion-exchange techniques and then applying a uniform field across two electrode pads on the crystal surface, thus creating an electric field opposite to the polarization direction (+Z direction) of the crystal. The electric field reverses the domains in selective regions defined by the ion exchange grating formed in the earlier step. This gives rise to a periodically reversed domain grating on the crystal surface.
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R.A. Rubino, D.E. Bossi, and J.D. Farina, "A Novel Thermal Poling Technique for Fabricating QPM SHG Structures in X-cut Lithium Tantalate" in Compact Blue-Green Lasers Topical Meeting, 1992, Optical Society of America, Washington, D.C., 1992, vol. 6, pp. 75-77.
Gopalan Venkatraman
Gupta Mool C.
Eastman Kodak Company
Ngo John
Owens Raymond L.
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