Abstract

Optical grade ${{\rm Dy}_2}{{\rm O}_3}$ ceramics was successfully produced by adding a small amount of ${{\rm ZrO}_2}$ as a sintering aid and hot isostatic pressing treatment at $1500^{\circ}{\rm C}$ after pre-sintering at $1550^{\circ}{\rm C}$. No residual pores, grain boundary phases, or second phases were detected inside the transparent ceramics. Since birefringence was not observed under the polarizer, the produced ${{\rm Dy}_2}{{\rm O}_3}$ ceramics is an optically isotropic body. There was almost no beam distortion during the laser irradiation test, and the optical loss was extremely small (${\lt}{0.1}\% {\rm /cm}$). The Verdet constant was ${422}\;{{\rm rad}\,{\rm T}^{- 1}}\;{{\rm m}^{- 1}}$ at a wavelength of 633 nm, and the extinction ratio was 34 dB.

© 2020 Optical Society of America

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