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Proceedings Paper

High-power laser float-zone crystal growth
Author(s): A. Cohen; Uwe Brauch; J. Muckenschnabel; Hans Opower
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Paper Abstract

A float zone crystal growth apparatus was developed. The heat source was a 3.5 kW CO2 Trumpf laser with a long term stability of 2 %. The original laser beam was divided, in the beam delivery system, into three equivalent focusable beams. The vacuum vessel is equipped with two equivalent rotation - translation systems with a maximum translational speed of 1 mm/minute. The vessel is also pierced with five windows, three of which serve the three incoming beams, one for observation with a television camera, one for an optical pyrometer or for direct observation. The three beam windows are protected by a laminar gas curtain. A heat shield system with an after heater is planned, in order to enable growth of high temperature oxides. The system was tested in the growth of small sapphire crystals (0 4 mm) and in the growth of silicon whose dimensions were 0 10 mm x 70 mm. * On leave from the Weizmann Institute, Rehovot, Israel

Paper Details

Date Published: 1 October 1990
PDF: 7 pages
Proc. SPIE 1276, CO2 Lasers and Applications II, (1 October 1990); doi: 10.1117/12.20556
Show Author Affiliations
A. Cohen, DLR (Germany)
Uwe Brauch, DLR (Germany)
J. Muckenschnabel, DLR (Germany)
Hans Opower, DLR (Germany)

Published in SPIE Proceedings Vol. 1276:
CO2 Lasers and Applications II
Hans Opower, Editor(s)

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