| CRYSTALMASTER Our Group 7000 Crystal
Grower provides the user with the two most
important parameters necessary for critical crystal growth: stability and control. Both
are necessary to assure consistency, repeatability, and uniformity—the keys to
successful crystal growth in the laboratory and in production.
Stability provides the
crystal grower with a known and
constant environment for demanding crystal growth. Stability assures uniform, tightly
defined temperatures and thermal gradients for consistent melts and zone refining.
Stability requires well-controlled gaseous or vacuum environments. Stability in crystal
growth demands smooth, highly constant, judder-free motions with large dynamic ranges,
programmable first and second derivatives, and multi-axis configuration.
Yet all must be controllable. The computer system interface must assure
that temperatures are held precisely where they are set and change quickly and smoothly to
their new values with minimum overshoot. The motion system must provide pull rates that
are highly consistent in both time and space—from moment to moment and from week to
week. Positional accuracy must be maintained throughout the complete draw cycle to assure
consistent and repeatable results from the Crystal Grower.
Whether Czochralski, Bridgman or top-seeded solution methods are being
used the Group 7000 Crystal Grower from Thermal Technology provides you with a
complete, integrated, designed-for-success marriage of the finest, most advanced methods
in crystal growing technology with the field proven performance of Astro laboratory
furnaces and controls. |
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A partial list of crystals
that have been successfully
grown with the Group 7000 Crystal Grower System includes:
Czochralski Technique • Barium sodium niobate •
Bismuth germanium oxide • Calcium molybdate • Lithium fluoride • Lithium
germanium oxide • Lithium niobate • Magnesium fluoride • Potassium chloride
• Strontium barium niobate • YAG • Sapphire • Silicon
Bridgman Technique • Cadmium fluoride • Cadmium
telluride • Gallium arsenide • Magnesium fluoride • Silver gallium selenide
• Silver gallium sulfide
Top-Seeded Solution Technique • Beta barium borate •
Lithium borate • Potassium titanium phosphide |
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