Abstract Scope |
In recent years, the demand for isolators for fiber lasers has expanded, and high-performance Faraday elements have been demanded. Until now, the main material was a TGG (Tb3Ga5O12) single crystal manufactured by the CZ (Czochralski) method, but a large magnet is required due to the low Verdet constant. In addition, as basic characteristics, the insertion loss and extinction ratio are not sufficient, and there is a drawback that the thermal lens and thermal birefringence are large, so that it cannot be applied to a high-power laser. The author developed TYO [(TbxY1-x)2O3] ceramics with the world’s largest Verdet constant for the above problem and confirmed the Verdet constant four times that of TGG. We also confirmed that our developed TAG (Tb3Al5O12) ceramics has the extremely low loss, high extinction ratio, and low thermal lens characteristics and achieved innovative results in the high-power range. |