Development of optical grade polycrystalline YIG ceramics for faraday rotator

Fully dense and infrared transparent YIG (Y3Fe5O12) ceramics was successfully produced by solid‐state reaction of Y2O3 and Fe2O3 powders. Its relative density reached 99.8% (5.16 g/cm3) after sintered at 1400°C for 3 hours, and almost 100% relative density (5.17 g/cm3) was obtained by additional HIP...

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Bibliographic Details
Published in:Journal of the American Ceramic Society 2018-11, Vol.101 (11), p.5120-5126
Main Authors: Ikesue, Akio, Aung, Yan Lin
Format: Article
Language:English
Subjects:
Ceramics
Crystal structure
Density
extinction ratio
Faraday effect
Grain boundaries
Hematite
Insertion loss
Iron oxides
isolator
Optical communication
Polycrystals
Single crystals
sintering
Sintering (powder metallurgy)
yttirum iron garnet
Yttrium oxide
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Summary:Fully dense and infrared transparent YIG (Y3Fe5O12) ceramics was successfully produced by solid‐state reaction of Y2O3 and Fe2O3 powders. Its relative density reached 99.8% (5.16 g/cm3) after sintered at 1400°C for 3 hours, and almost 100% relative density (5.17 g/cm3) was obtained by additional HIP treatment. It was transparent at wavelength ranges longer than 1100 nm, and its in‐line transmittance (ca. 75%‐77%) was very comparable to that of commercial YIG single crystal especially over 1700 nm. Faraday rotation angle at 1300 and 1550 nm was 224 and 175 deg/cm, respectively, and extinction ratio was 35 dB and insertion loss polarized at 45° was 0.3 dB at 1550 nm. It was confirmed that the Faraday effect of polycrystalline material which has numerous grain boundaries and randomized crystal orientations is analogous to that of the single crystal. To the best of our knowledge, this is the first report to achieve highly transparent polycrystalline iron garnet ceramics successfully, and it is expected to use as an optical isolator in optical communication and medical field.
ISSN:0002-7820
1551-2916
DOI:10.1111/jace.15772