Preparation of CaF2 precursors for laser grade crystal growth |
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Authors: | I T Mouchovski V B Genov L V Pirgov V Tz Penev |
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Affiliation: | (1) Central Laboratory of Mineralogy and Crystallography, Bulgarian Academy of Sciences, 92 Rakovski St., 1000 Sofia, Bulgaria e-mail: mincryst@bgcict.acad.bg Fax: +3592-884979, BG |
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Abstract: | The expansion of commercial excimer lasers has increased the need of high-quality optics manufactured from CaF2. The key technical parameters, affecting the long-term quality of CaF2 excimer laser optics, are controlled by the purity of the raw material. The new purifying techniques provide 99.99% purity
of the starting material which rises up to 99.999% into the grown crystals. However, the techniques are rather expensive which
leads to a significant rise in the price of the final crystal product. The present paper describes an alternative highly effective
and relatively low-cost technique providing a precise control over a set of preparatory and purifying procedures and crystal
growth. Using an original apparatus for electro-chemical grinding of the thermo-broken starting material, the grained product,
uncontaminated by unintentional impurities, may be highly purified by two complementary methods to produce precursors used
for UV- and laser-grade CaF2 crystal growth.
Received: 20 April 1999 / Reviewed and accepted: June 2, 1999 |
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Keywords: | Calcium fluoride Highly purified precursors Crystal growth Laser optics |
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