| 摘要 |
An optical medium having a high refractive index without anisotropy and a wide transmission wavelength is obtained. The cubic crystal material is ±²O 3 , where ± is at least one of K, Ba, Sr, Ca, and ² is at least one of Ta, Ti. Optimally, the cubic crystal material is KTa 1-x Nb x O 3 , where composition x is 0‰ x‰ 0.35. This composition enables to raise refractive index while its phase transition temperature is below a room temperature. |
