Single crystal wafer of lithium tantalate

Details Single crystal wafer of lithium tantalate Single crystal wafer of lithium tantalate

1987-03-04

1988-10-11

Straub, Gary P.

Adhesive bonding and miscellaneous chemical manufacture

Methods

Surface bonding and/or assembly therefor

156DIG87, 73866, C30B 2930, C30B 3300

Patent

active

047769173

ABSTRACT:
The single crystal wafer of lithium tantalate provided by the invention is characterized by the limited range of variation of the value of double refraction which should not exceed .+-.6.times.10.sup.-4 so that the value of the double refraction is given by 4.5.times.10.sup.-3 .+-.6.times.10.sup.-4. When single crystal wafers of lithium tantalate each satisfying the above requirements are used for the manufacture of SAW devices, the devices may have a very small deviation of the SAW sound velocity from the standard value and the range of variation of the SAW sound velocity within a wafer is also very small so that the SAW devices can be manufactured with greatly improved productivity and excellent quality.

REFERENCES:
patent: 3788890 (1974-01-01), Mader et al.
patent: 3976535 (1976-08-01), Barns
patent: 4257825 (1981-03-01), Schaumburg
patent: 4371419 (1983-02-01), Fukuda et al.
patent: 4379620 (1983-04-01), Erickson
Smith et al., Correlation of Reduction of Optically Reduced Retractive Index in Homogenity with OH content in LiTaO.sub.3 and LinbO.sub.3 Journal of Applied Physics, vol. 39 #10 Sep. 68.
Kaminon et al. Optical Wageguiding Layers in LiNbO.sub.3 and LiTaO.sub.3 Appl. Phys. Letters. vol. 22 #7, Apr. 73.
Iwasaki et al. Single Crystal Growth and Physical Properties of LiTaO.sub.3 Review of the Electrical Communications Laboratories, vol. 20 #1 & 2 Jan.-Feb. 72.

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