Method of producing crystalline rods having regions of reversed

Details Method of producing crystalline rods having regions of reversed Method of producing crystalline rods having regions of reversed

1991-07-23

1992-12-15

Kunemund, Robert

Adhesive bonding and miscellaneous chemical manufacture

Delaminating processes adapted for specified product

Delaminating in preparation for post processing recycling step

156600, 15662072, 156DIG71, 156DIG73, 156DIG87, C30B 110

Patent

active

051714000

ABSTRACT:
A method of growing a single crystal rod with regions of reversed dominant ferroelectric polarities (poling the same) is described. It is a variation of laser-heated pedestal growth. The microscopic growth rate of the crystal is modulated to incorporate into the rod, the compositional melt gradient which is formed at the freezing interface. When this gradient is of the proper sign and the poling action due to it is of sufficient strength to overcome the normal poling action with which the rod would otherwise grow, it defines a reversed domain region. This region is reduced in temperature to below the Curie temperature before the gradient responsible for the same can diffuse. A method of clarifying a single crystal to make the same transparent to optical radiation of interest is also described.

REFERENCES:
patent: 3446603 (1969-05-01), Loiacono et al.
patent: 3607752 (1971-09-01), Graenicher
patent: 4623423 (1986-11-01), Aubert et al.
patent: 4640736 (1987-02-01), Holman
Holman et al., "Chemical Control of Optical Damage in Lithium Niobate" Applied Physics Letters 32(5) Mar. 1, 1978 pp. 280-283.

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