Abstract
(Dy0.7Y0.25La0.05)2O3 magneto-optical transparent ceramics were successfully fabricated by pressureless sintering in reductive H2 atmosphere (PLSH). The raw powder of (Dy0.7Y0.25La0.05)2O3 was synthesized by a modified self-propagating high-temperature synthesis (SHS) and sintered to transparent ceramics at 1400–1600 °C in a flowing H2 atmosphere, showing good sinterability of the as-synthesized raw powder. The magneto-optical Verdet constant of (Dy0.7Y0.25La0.05)2O3 transparent ceramics was measured to be −191.57 rad/(T·m) at a wavelength of 632.8 nm. In this magneto-optical material of (Dy0.7Y0.25La0.05)2O3, relative cheaper Dy and Y were used to replace Tb, and the low cost and good magneto-optical property showed the advantage of application on Faraday isolators (FIs) and Faraday rotators (FRs).
Highlights
Magneto-optical (M-O) material is an essential component of Faraday isolators (FIs) and Faraday rotators (FRs), which can be used in fiber-optic communication to effectively isolate external light from the light sources [1,2,3]
1 shows the X-ray diffraction pattern of (Dy0.7Y0.25La0.05)2O3 powder synthesized by SHS
It can be be seen from thatthe thediffraction diffraction peaks of
Summary
Magneto-optical (M-O) material is an essential component of Faraday isolators (FIs) and Faraday rotators (FRs), which can be used in fiber-optic communication to effectively isolate external light from the light sources [1,2,3]. Tb3 Ga5 O12 (TGG) with garnet structure is widely used as a magneto-optical material, and its Verdet constant is −134 rad/(T·m) [4] at 632.8 nm. It has been found that rare-earth sesquioxide RE2 O3 (RE = Tb, Dy) of paramagnetic RE3+ ions has a higher Verdet constant than TGG crystal [6,7,8]. Prepared Y, La-doped (Dyx Y0.95−x La0.05 ) O3 transparent ceramics using a vacuum sintering method at an extremely high temperature of 1780 ◦ C. Despite the high achieved quality of ceramics, the use of such a sintering additive can limit the service life of magneto-optical elements due to a change in the oxidation state of zirconium ions under the laser radiation, the appearance of free charge carriers and, a sharp increase in absorption.
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