Open AccessLow phonon energies and wideband optical windows of La2O3-Ga2O3 glasses prepared using an aerodynamic levitation technique
Author(s) -
Kohei Yoshimoto,
Atsunobu Masuno,
Motoi Ueda,
Hiroyuki Inoue,
Hiroshi Yamamoto,
Tastunori Kawashima
Publication year - 2017
Publication title -
scientific reports
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.24
H-Index - 213
ISSN - 2045-2322
DOI - 10.1038/srep45600
Subject(s) - materials science , oxide , ion , ultraviolet , analytical chemistry (journal) , ionic bonding , phonon , raman spectroscopy , wavelength , optics , optoelectronics , chemistry , condensed matter physics , physics , organic chemistry , chromatography , metallurgy
x La 2 O 3 -(100 − x )Ga 2 O 3 binary glasses were synthesized by an aerodynamic levitation technique. The glass-forming region was found to be 20 ≤ x ≤ 57. The refractive indices were greater than 1.92 and increased linearly with increasing x . The polarizabilities of oxide ions were estimated to be 2.16–2.41 Å 3 , indicating that the glasses were highly ionic. The glasses were transparent over a very wide range from the ultraviolet to the mid-infrared region. The widest transparent window among the oxide glasses was from 270 nm to 10 μm at x = 55. From the Raman scattering spectra, a decrease in bridging oxide ions and an increase in non-bridging oxide ions were confirmed to occur with increasing La 2 O 3 content. The maximum phonon energy was found to be approximately 650 cm −1 , being one of the lowest among oxide glasses. These results show that La 2 O 3 -Ga 2 O 3 binary glasses should be promising host materials for optical applications such as lenses, windows, and filters over a very wide wavelength range.