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http://dx.doi.org/10.6111/JKCGCT.2022.32.6.219

Analysis of calcium fluoride single crystal grown by the czochralski method  

Lee, Ha-Lin (Department of Advanced Materials Engineering, Dong-Eui University)
Na, Jun-Hyuck (Department of Advanced Materials Engineering, Dong-Eui University)
Park, Mi-Seon (Department of Advanced Materials Engineering, Dong-Eui University)
Jang, Yeon-Suk (Department of Advanced Materials Engineering, Dong-Eui University)
Jung, Hea-Kyun (SELIG)
Kim, Doo-Gun (KOPTI)
Lee, Won-Jae (Department of Advanced Materials Engineering, Dong-Eui University)
Publication Information
Journal of the Korean Crystal Growth and Crystal Technology / v.32, no.6, 2022 , pp. 219-224 More about this Journal
Abstract
CaF2 single crystal has a large band gap (12 eV), and it is used for optical windows, prisms, and lenses due to its excellent transmittance in a wide wavelength range and low refractive index. Moreover, it is expected to be one of the materials for ultraviolet transmissive laser optical components. CaF2 belongs to the fluoride compounds and has a face-centered cubic (FCC) structure with three sub-lattices. The representative method for CaF2 single crystal growth is Czochralski, which method has the advantages of high production efficiency and the ability to make large crystals. In this study, X-ray diffraction (XRD), X-ray rocking curves (XRC) measurement, and chemical etching were performed to analyze the crystallinity and defect density of the CaF2 single crystals, grown by the Czochralski method. Fourier-transform infrared spectroscopy (FT-IR) and UV-VIS-NIR spectroscopy systems were used to investigate the optical properties of the CaF2 crystal. The provability of various applications, including UV application, was systematically investigated with various analysis results.
Keywords
$CaF_2$; Czochralski method; Crystallinity; Optical properties;
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