OSA's Digital Library

Journal of the Optical Society of America

Journal of the Optical Society of America

  • Vol. 39, Iss. 9 — Sep. 1, 1949
  • pp: 731–740

Artificial Fluorite

DONALD C. STOCKBARGER  »View Author Affiliations


JOSA, Vol. 39, Issue 9, pp. 731-740 (1949)
http://dx.doi.org/10.1364/JOSA.39.000731


View Full Text Article

Acrobat PDF (1477 KB)





Browse Journals / Lookup Meetings

Browse by Journal and Year


   


Lookup Conference Papers

Close Browse Journals / Lookup Meetings

Article Tools

Share
Citations

Abstract

This paper presents a condensed history of the research on artificial optical fluorite growth which was begun in the middle 1920’s and reduced to practice under N.D.R.C. Contract OEMsr-45 with the Massachusetts Institute of Technology during 1940–45.

Fluorite castings were produced eventually by freezing purified molten CaF2, contained in chemically clean graphite crucibles, in a vacuum-type contrivance patterned after the atmospheric furnace which had been developed earlier for growing lithium fluoride crystals.

The melt was prepared by heating selected fragments of colorless fluorspar mixed with about 2 percent PbF2 which acted as a scavenger to eliminate certain more or less unavoidable impurities, notably products of hydrolysis, and which escaped before the crystallization. In a few instances it was made from a specially synthesized material although this procedure was not wholly desirable.

The crucibles were made by boring, reaming and turning graphite rods which possessed exceptional strength, homogeneity, and chemical purity. Their wall thickness was approximately 0.03 inch when feasible.

Crystallization occurred preferably in a thermal field characterized by a high, nonlinear temperature gradient which remained nearly constant with time.

Specimens chosen from about 1500 crystals, ranging up to 6 inches in diameter, were comparable with good natural fluorite in all essential properties and equal or superior to the best in soundness and dimensions.

Citation
DONALD C. STOCKBARGER, "Artificial Fluorite," J. Opt. Soc. Am. 39, 731-740 (1949)
http://www.opticsinfobase.org/josa/abstract.cfm?URI=josa-39-9-731

You do not have subscription access to this journal. Citation lists with outbound citation links are available to subscribers only. You may subscribe either as an OSA member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Log in to access OSA Member Subscription

You do not have subscription access to this journal. Cited by links are available to subscribers only. You may subscribe either as an OSA member, or as an authorized user of your institution.

Contact your librarian or system administrator
or
Log in to access OSA Member Subscription

« Previous Article  |  Next Article »

OSA is a member of CrossRef.

CrossCheck Deposited