Optical Spectra of Y3Al5O12(YAG) Single Crystals in the Vacuum Ultraviolet Region

Autor:	Tomoyoshi Futemma, Tetsuhiko Tomiki, Hirohito Fukutani, Tsuneaki Miyahara, Junkoh Tamashiro, Yoshihiro Aiura, Hiroo Kato, Yoshiiku Ganaha, Akira Yonesu, Tohru Shikenbaru, Masatada Yuri
Rok vydání:	1989
Předmět:	Permittivity Materials science Absorption spectroscopy business.industry Exciton General Physics and Astronomy Electron Dielectric Optical conductivity Spectral line Optics Atomic physics business Refractive index
Zdroj:	Journal of the Physical Society of Japan. 58:1801-1810
ISSN:	1347-4073 0031-9015
DOI:	10.1143/jpsj.58.1801
Popis:	The reflectivity spectrum of Y 3 Al 5 O 12 (YAG) single crystals at 297 K is presented in the region of 6.734 eV ≤ E ≤116 eV. The spectra of optical constants derived from the reflectivity by the Kramers-Kronig analysis are tentatively interpreted in terms of the energy levels of the constituent atoms of YAG. Plasma resonance peaks are found at 23.3 8 eV and 36.2 0 eV in which the valence-band electrons and valence- as well as full-band electrons participate, respectively. The structure of absorption due to excitations of the electrons in the Al 3+ L 2,3 levels is found in the region of E ≥76 eV. The free electron-like absorption calculated by the Drude formula by use of the line shape parameters of the plasma resonance line is compared with the dielectric constant in the region of E ≥24 eV. The effective optical dielectric constant calculated from the optical constant e 2 is found to be in good agreement at 116 eV with the optical dielectric constant derived from the dispersion formula.
Databáze:	OpenAIRE
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