Tb₃Al_2.5 Ga_2.5O₁₂ transparent ceramic for magneto‐optical application

Abstract

The optical quality and microstructure of the Tb3Al2.5 Ga2.5O12 transparent ceramic were investigated and compared with those of terbium gallium garnet (Tb3Ga5O12 TGG) and terbium aluminum garnet (Tb3Al5O12 TAG). The transmission of the Tb3Al2.5 Ga2.5O12 ceramic was as high as 80% in the visible and near‐infrared (IR) regions, which was close to the theoretical value. The Verdet constant of the Tb3Al2.5 Ga2.5O12 ceramic measured at 632.8 nm and room temperature was −150.6 rad/Tm, which was 12% larger than that of the TGG single crystal and 13% smaller than that of the TAG single crystal, and the Tb3Al2.5 Ga2.5O12 ceramic showed the highest transparency among these three samples.

A review on magneto-optical ceramics for Faraday isolators

“…(Tb1-x-yLuxScy)3(Al1-zScz)5O12 [185], and Tb3(Al1-xGax)5O12 [180,186] ceramics have been studied and the results showed that these substitution ions can also help improve the optical quality of TAG ceramics. However, the thermal conductivity and the Verdet constant decrease inevitably due to the high addition amount (>10 at.% in TAG).…”

High‐entropy transparent ceramics: Review of potential candidates and recently studied cases

“…These solid solution transparent garnet ceramics could also be used as phosphors and magneto‐optical materials. For example, transparent GAGG:Cr 3+ ‐Eu 3+ ceramics have been used as red persistent phosphors, and Tb 3 Al 2.5 Ga 2.5 O 12 transparent ceramics have been used as magneto‐optical materials 141,142 …”

“…For example, transparent GAGG:Cr 3+ -Eu 3+ ceramics have been used as red persistent phosphors, and Tb 3 Al 2.5 Ga 2.5 O 12 transparent ceramics have been used as magneto-optical materials. 141,142…”

Fabrication and characterizations of Ho3Sc2Al3O12 magneto‐optical transparent ceramics

“…Furthermore, transparent ceramics not only maintain excellent optical quality but also exhibit superior size scalability with rapid preparation, making them an attractive choice for laser application. At present, TGG ceramics have been reported with properties similar to those of crystals, which show outstanding Verdet constants (approximately −36.4 and −39 rad T −1 m −1 at 1064 nm) and high thermal conductivity (4.9 W m −1 K −1 at 300.00 K) 20,21 . Additionally, a few magneto‐optical ceramic materials have been reported with certain application potential, including Tb 3 Al 5 O 12 (TAG), 22,23 Dy 3 Al 5 O 12 (DyAG), 24 Tb 2 Zr 2 O 7 , 25 and Tb 2 Ti 2 O 7 26 .…”