Impurities in synthetic fluorite for deep ultraviolet optical applications

Autor(en): Sils, J.
Hausfeld, S.
Clauss, W.
Pahl, U.
Lindner, R.
Reichling, M. 
Stichwörter: 157 NM; ABSORPTION; ACTIVATED LASER CRYSTALS; CAF2; CAF2(111) SURFACES; CALCIUM-FLUORIDE; IONS; LUMINESCENCE SPECTRA; Physics; Physics, Applied; SINGLE-CRYSTALS; SPECTROSCOPIC PROPERTIES
Erscheinungsdatum: 2009
Herausgeber: AMER INST PHYSICS
Journal: JOURNAL OF APPLIED PHYSICS
Volumen: 106
Ausgabe: 6
Zusammenfassung: 
The impurity content of synthetic calciumdifluoride (fluorite, CaF2) single crystals produced for optical applications in the deep ultraviolet (DUV) and infrared (IR) spectral regions are investigated by luminescence and absorption spectroscopy. Lead, oxygen, and rare earth (RE) ions, namely, trivalent (Ce3+, Pr3+, Sm3+, Eu3+, Gd3+, Tb3+, Dy3+, Ho3+, Er3+, and Yb3+) and divalent (Eu2+) are identified as common impurities. RE ions are dominating impurities in the IR grade sample and the impurity concentration for this sample is found to be about 100 times higher than the one for DUV samples. Due to the strongly reduced RE luminescence background, we additionally identify lead and oxygen in DUV grade crystals. Remarkable differences in the luminescence spectra are found when comparing DUV grade crystals from different sources. (C) 2009 American Institute of Physics. [doi:10.1063/1.3224879]
ISSN: 00218979
DOI: 10.1063/1.3224879

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