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Transparent Cr4+‐Doped YAG Ceramics for Tunable Lasers
Author(s) -
Ikesue Akio,
Yoshida Kunio,
Kamata Kiichiro
Publication year - 1996
Publication title -
journal of the american ceramic society
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.9
H-Index - 196
eISSN - 1551-2916
pISSN - 0002-7820
DOI - 10.1111/j.1151-2916.1996.tb08154.x
Subject(s) - materials science , ceramic , doping , oxygen , transparent ceramics , absorption (acoustics) , sintering , analytical chemistry (journal) , laser , ion , mineralogy , metallurgy , composite material , optoelectronics , optics , chemistry , physics , organic chemistry , chromatography
Transparent Cr 4+ :YAG (Y 3 Al S O 12 ) ceramics doped with Ca and Mg as counterions and SiO 2 as a sintering aid were fabricated by a solid‐state reaction method using high‐purity powders of Al 2 O 3 , Y 2 O 3 , and Cr 2 O 3 . The mixed powder compacts were sintered at 1750°C for 10 h in oxygen, or 1750°C for 10 h under vacuum, and then annealed at 1400°C for 10 h in oxygen. Cr‐doped YAG ceramics sintered in oxygen had a brown color and characteristic absorption by Cr 4+ ions, whereas these YAG ceramics sintered under different conditions (vacuum + oxygen) had a green color and absorption at ∼590 and 430 nm by Cr 3+ ions. The absorption behavior of YAG ceramics sintered in oxygen was almost equivalent to that of Cr 4+ :YAG single crystals fabricated by the Czochralski method.