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Transparent cobalt‐doped yttrium aluminum garnet (Co 2+ :YAG) ceramics—An innovatory fast saturable absorber
Author(s) -
Szysiak Agnieszka,
LeśniewskaMatys Kamila,
Węglarz Helena,
Gołębiewski Przemysław,
Podniesiński Dariusz,
Kozłowska Anna
Publication year - 2021
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/jace.17573
Subject(s) - materials science , saturable absorption , ceramic , scanning electron microscope , microstructure , analytical chemistry (journal) , yttrium aluminium garnet , doping , yttrium , annealing (glass) , cobalt , absorption spectroscopy , mineralogy , optics , composite material , optoelectronics , wavelength , metallurgy , chemistry , chromatography , fiber laser , oxide , physics
Highly transparent Y 3 Al 5 O 12 (YAG) ceramics doped with 0.025 and 0.05 at.% Co ions were prepared for the first time by the freeze granulation process and reaction sintering. Scanning electron microscopy (SEM) and X‐ray diffraction (XRD) were performed to analyze the microstructure and crystal structure of the samples. The absorption spectra of the Co 2+ :YAG ceramics were measured at room temperature, and significant absorption bands at 600 nm, as well as at 1535 nm, were observed. The nonlinear behavior of the received material was experimentally demonstrated. Due to the short relaxation time of investigated ceramics, we considered them as fast saturable absorbers. The influence of the postsintering annealing process was examined. The values of saturation intensities of YAG ceramics with different concentrations of cobalt were estimated by fitting experimental data to the theoretical model for fast saturable absorbers.