Abstract
As a kind of promising material for a Faraday isolator used in the visible and near infrared range, Dy2O3 transparent ceramics were prepared by vacuum sintering from the nano-powders synthesized by the liquid precipitation method using ammonium hydrogen carbonate as precipitant with no sintering aids. The synthesized precursor was calcinated at 950 °C–1150 °C for 4 h in air. The influences of the calcination temperature on the morphologies and phase composition of Dy2O3 powders were characterized. It is found that the Dy2O3 powder calcinated at 1000 °C for 4 h is superior for the fabrication of Dy2O3 ceramics. The Dy2O3 transparent ceramic sample prepared by vacuum sintering at 1850 °C for 10 h, and subsequently with air annealing at 1400 °C for 10 h, from the 1000 °C-calcined Dy2O3 powders, presents the best optical quality. The values of in-line transmittance of the optimal ceramic specimen with the thickness of 1.0 mm are 75.3% at 2000 nm and 67.9% at 633 nm. The Verdet constant of Dy2O3 ceramics was measured to be −325.3 ± 1.9 rad/(T·m) at 633 nm, about 2.4 times larger than that of TGG (Tb3Ga5O12) single crystals.
Highlights
Along with the propelling of magneto-optical devices, it becomes gradually essential to investigate the state-of-the art technology to obtain magneto-optical materials due to their irreplaceable roles in laser [1], optical communication [2], optical fiber sensing [3], and other fields
The Dy2 O3 precursor prepared by liquid precipitation method needs to be calcined at a certain temperature to become Dy2 O3 powder
The selection of the calcination temperature is extremely important for the preparation of high-quality nano-powder and transparent ceramics
Summary
Along with the propelling of magneto-optical devices, it becomes gradually essential to investigate the state-of-the art technology to obtain magneto-optical materials due to their irreplaceable roles in laser [1], optical communication [2], optical fiber sensing [3], and other fields. The most widely studied and applied magneto-optical device is the magneto-optical isolator. Its main function is to prevent the beam reflecting from the optical fiber and components of the optical path from reentering the lasers, and avoid causing damage to its components or interference with the incident light [4,5]. The additional optical reflection will make the optical communication system unstable and limits the transmission of the long-distance optical signal. The optical isolator, which only allows the optical signal to transmit in one direction along the optical path, is necessary to solve this problem
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