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CZOCHRALSKI GROWTH OF LAALO3.
Semiannual rept., 1 Aug 66-31 Jan 67,
UNION CARBIDE CORP INDIANAPOLIS IND ELECTRONICS DIV
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Good quality spinel single crystals both undoped and Cr3-doped were grown via a modified Czochralski process similar to that utilized for the growth of LaAlO3. Spectroscopic studies of Cr3-doped samples indicate a half-intensity line width at room temperature of about 50A for the principal component centered around 6876A. Fluorescent lifetimes of 12 and 11 milliseconds were measured at -183C and 24C respectively for this component. Several much narrower bands of variable intensity depending upon the radiation history of the specimen were also observed. The absorption spectrum of Cr3-MgAl2O4 resembles that of ruby, but the absorption coefficients are significantly lower. Lasing tests carried out with fabricated rods of Cr-doped spinel have thus far not yielded any detectable laser output. Lasing attempts with CrLaAlO3 rods fabricated from crystals grown during the course of this program have likewise not yet proved successful. Author
APPROVED FOR PUBLIC RELEASE