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Analysis of calcium fluoride single crystal grown by the czochralski method

  • Journal of the Korean Crystal Growth and Crystal Technology
  • Abbr : J. Korean Cryst. Growth Cryst. Technol.
  • 2022, 32(6), pp.219~224
  • DOI : 10.6111/JKCGCT.2022.32.6.219
  • Publisher : The Korea Association Of Crystal Growth, Inc.
  • Research Area : Engineering > Materials Science and Engineering
  • Received : November 2, 2022
  • Accepted : November 28, 2022
  • Published : December 31, 2022

Ha-Lin Lee 1,  Jun-Hyuck Na 1,  Mi-Seon Park 1,  Yeon-Suk Jang 1,  Hea-Kyun Jung 2,  Doo Gun Kim 3,  Won-Jae Lee 1

1동의대학교
2SELIG
3한국광기술원

Accredited

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 UVVIS-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.

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