Single-crystal – oriented-crystal – and epitaxy growth processes; – Processes of growth from liquid or supercritical state – Having pulling during growth
Patent
1998-03-12
2000-06-13
Kunemund, Robert
Single-crystal, oriented-crystal, and epitaxy growth processes;
Processes of growth from liquid or supercritical state
Having pulling during growth
117 23, 117208, 117910, 117948, C30B 1534
Patent
active
060744774
ABSTRACT:
A process is disclosed for producing an integrated composite oxide single crystal body composed of a core portion made of an oxide single crystal and a clad portion integrated with the core portion and made of another oxide single crystal having a composition different from that of the oxide single crystal constituting the core portion, the process comprising the steps of: (1) preparing a first melt in a first crucible by melting a first material for a first oxide single crystal to constitute the core portion inside the first crucible, (2) preparing a second melt inside a second crucible by melting a second material for a second oxide single crystal to constitute the clad portion inside the second crucible, (3) contacting a seed crystal to the first and second melts, (4) pulling down the first melt through a pull-out opening of the first crucible, (5) pulling down the second melt through a pull-out opening of the second crucible and contacting the pulled-down second melt with a pulled-down portion of the first melt, and (6) integrally pulling down the first and second melts.
REFERENCES:
patent: 4242553 (1980-12-01), Berkman et al.
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Vasil 'EV et al: "two layer single crystal fiber waveguides" Soviet Journal of Quantum Electronics., vol. 15, No. 12, Dec. 1985, Woodbury NY US, pp. 1646-1647, XP002066401.
Patent Abstracts of Japan vol. 14, No. 4 (P-986), Jan. 9, 1990 & JP 01 257802 A (Nippon Telegr. & Teleph. Corp. NTT).
Shimamura: "A new crystal growth method for in-situ core doping" Journal of Crystal Growth., vol. 142, No. 3/4, Sep. 1994, Amsterdam NL, pp. 400-402, XP000468435.
Epelbaum et al: "A double die modification of micro pulling down method for in situ clad/core doping of fiber crystal" Journal of Crystal Growth., vol. 179, Aug. 1997, Amsterdam, NL, pp. 559-566, XP004096616.
Fukuda Tsuguo
Imaeda Minoru
Kawaguchi Tatsuo
Shimamura Kiyoshi
Kunemund Robert
NGK Insulators Ltd.
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