TERBIUM-CONTAINING PARAMAGNETIC GARNET-TYPE TRANSPARENT CERAMIC, AND MAGNETO-OPTICAL DEVICES

• Main Authors: TANAKA KEITA, MATSUMOTO TAKUSHI, IKARI MASANORI
• Format: Patent
• Language: English; Japanese
• Published: 14.09.2023
• Subjects: ARTIFICIAL STONE; CEMENTS; CERAMICS; CHEMISTRY; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDINGMATERIALS; CONCRETE; DEVICES OR ARRANGEMENTS, THE OPTICAL OPERATION OF WHICH ISMODIFIED BY CHANGING THE OPTICAL PROPERTIES OF THE MEDIUM OF THEDEVICES OR ARRANGEMENTS FOR THE CONTROL OF THE INTENSITY,COLOUR, PHASE, POLARISATION OR DIRECTION OF LIGHT, e.g.SWITCHING, GATING, MODULATING OR DEMODULATING; FREQUENCY-CHANGING; LIME, MAGNESIA; METALLURGY; NON-LINEAR OPTICS; OPTICAL ANALOGUE/DIGITAL CONVERTERS; OPTICAL ELEMENTS, SYSTEMS, OR APPARATUS; OPTICAL LOGIC ELEMENTS; OPTICS; PHYSICS; REFRACTORIES; SLAG; TECHNIQUES OR PROCEDURES FOR THE OPERATION THEREOF; TREATMENT OF NATURAL STONE

To provide a terbium-containing paramagnetic garnet-type transparent ceramic having low absorption at a wavelength of 1,064 nm and a temperature coefficient of refractive index that is half or less that of existing TGG crystals.SOLUTION: A sintered compact of a composite oxide comprises terbium, yttrium and aluminum, wherein: a volume molar concentration of terbium is equal to or more than the volume molar concentration of yttrium; the Verde constant at a wavelength of 1,064 nm is 30 rad/(T-m) or more; and the average value (dn(1064)/dt)ave of a temperature coefficient of refractive index at 1,064 nm and temperatures of 20, 30, and 40°C is equal to or less than 9.0×10-6(K-1).SELECTED DRAWING: Figure 1 【課題】波長１０６４ｎｍで低吸収率であると共に、屈折率の温度係数が既存のＴＧＧ結晶の半分以下であるテルビウム含有常磁性ガーネット型透明セラミックスを提供する。【解決手段】テルビウムとイットリウムとアルミニウムとを含み、該テルビウムの含有体積モル濃度がイットリウムの含有体積モル濃度以上である複合酸化物の焼結体であり、波長１０６４ｎｍにおけるベルデ定数が３０ｒａｄ／（Ｔ・ｍ）以上であり、波長１０６４ｎｍ、温度２０、３０、４０℃における屈折率の温度係数の平均値（ｄｎ（１０６４）／ｄｔ）aveが９．０×１０-6（Ｋ-1）以下である。【選択図】図１