Method of producing single crystal of KTiOPO.sub.4

Details Method of producing single crystal of KTiOPO.sub.4 Method of producing single crystal of KTiOPO.sub.4

1993-05-05

1994-12-06

Breneman, R. Bruce

Single-crystal, oriented-crystal, and epitaxy growth processes;

Processes of growth from liquid or supercritical state

Having pulling during growth

117 13, 117937, 423306, 423593, 423616, C30B 912

Patent

active

053700767

ABSTRACT:
A method of growing a single crystal of KTiOPO.sub.4 which is a nonlinear optical material is disclosed. Growth of the single crystal of KTiOPO.sub.4 is carried out by melting a KTiOPO.sub.4 material with a flux to produce a melt, then contacting a seed crystal to the melt, and by slowly cooling at a saturation temperature or below. At this time, molar fractions of K.sub.2 O, P.sub.2 O.sub.5 and TiO.sub.2 contained in the melt fall within a region surrounded by six point in a K.sub.2 O-P.sub.2 O.sub.5 -TiO.sub.2 ternary phase diagram of A (K.sub.2 O:0.4150, P.sub.2 O.sub.5 :0.3906, TiO.sub.2 : 0.1944), B (K.sub.2 O:0.3750, P.sub.2 O.sub.5 : 0.3565, TiO.sub.2 : 0.2685), C (K.sub.2 O: 0.3750, P.sub.2 O.sub.5 : 0.3438, TiO.sub.2 : 0.2813), D (K.sub.2 O: 0.3850, P.sub.2 O.sub.5 : 0.3260, TiO.sub.2 : 0.2890), E (K.sub.2 O: 0.4000, P.sub.2 O.sub.5 : 0.3344, TiO.sub.2 : 0.2656), and F (K.sub.2 O: 0.4158, P.sub.2 O.sub.5 : 0.3744, TiO.sub.2 : 0.2098). In addition, K.sub.15 P.sub.13 O.sub.40 or the same composition produced by melting is used as the flux, and the proportion of a KTiOPO.sub.4 element in a composition of the melt is prescribed to 83.5 to 90.0 mol %. The seed crystal is set so that a C axis is in a direction perpendicular to a melt surface. Then, the seed crystal contacted to the melt is rotated and slowly cooled. Thus, a single crystal of KTiOPO.sub.4 of single domain at the end of growth can be produced.

REFERENCES:
patent: 4305778 (1981-12-01), Gier
patent: 4724038 (1988-02-01), Pastor et al.
patent: 4746396 (1988-05-01), Marnier
patent: 4761202 (1988-08-01), Bordui et al.
patent: 4961819 (1990-10-01), Marnier
patent: 5066356 (1991-11-01), Ferretti et al.
patent: 5084206 (1992-01-01), Ballman et al.
patent: 5264073 (1993-11-01), Cheng
"X-ray topography study of flux grown KTP crystals"; Halfpenny, et al; Journal of Crystal Growth (113) 1991 pp. 722-725.
"Solubility and Crystal Growth of KiTuOPO.sub.4 In Polyphosphate Solvents", Loiacono et al; Journal of Crystal Growth 104 (1990) pp. 389-391.

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