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Transparent ceramic, method for manufacturing same, and magneto-optical device

A technology of transparent ceramics and manufacturing methods, applied in chemical instruments and methods, optical components, instruments, etc., can solve problems such as reduction of extinction ratio, achieve small component changes, less scattering, and reduce heterogeneous precipitates or pores.

Inactive Publication Date: 2014-01-08
SHIN ETSU CHEM CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Therefore, the extinction ratio decreases

Method used

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  • Transparent ceramic, method for manufacturing same, and magneto-optical device
  • Transparent ceramic, method for manufacturing same, and magneto-optical device
  • Transparent ceramic, method for manufacturing same, and magneto-optical device

Examples

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Embodiment 1～63 and comparative example 1～15

[0160] According to the method shown in FIG. 1 , according to the raw materials and conditions shown in Tables 1-7 (Example) and Tables 8-9 (Comparative Examples), transparent rare earth oxide ceramics containing terbium oxide were produced respectively. In addition, Examples 1-9 did not perform annealing.

[0161] A predetermined amount of sintering aid was added to each raw material powder as a dispersant and a binder, and effective amounts of ethyl cellulose and polyvinyl alcohol were added, and then mixed by a pot mill to obtain a mixture. Then, the above-mentioned mixture is spray-dried to obtain particles with a particle diameter of several tens of micrometers. Using the above-mentioned pellets, mold molding is performed as primary molding, and then CIP is performed as secondary molding to obtain a molded body. The obtained compact is calcined at 200 to 1000° C. in the air, and then fired at 1600 to 1800° C. in a predetermined atmosphere (main firing). Next, the obtain...

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PUM

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Abstract

A transparent ceramic having terbium oxide (Tb2O3) in a molar ratio of at least 40%; and at least one oxide selected among an yttrium oxide, a scandium oxide, and a lanthanide rare earth oxide, wherein (1) the crystal structure of the terbium-oxide-based ceramic does not contain a non-cubic-crystal phase, (2) the mean crystal particle diameter is in a range of 0.5 to 100 mum, and (3) the ceramic comprises a sintering auxiliary having no incidence of deposition of a non-cubic-crystal phase in the crystal structure of the terbium-oxide-based ceramic. This transparent ceramic makes a magneto-optical element that performs at least as well as terbium gallium garnet or other existing monocrystal materials. It also makes a functional element for an optical isolator in the infrared region between 500 nm and 1.5 mum having very little scattering and very few birefringence components.

Description

technical field [0001] The present invention relates to a transparent ceramic effective as a magneto-optical device for constituting a magneto-optical device such as an optical isolator, and a method for producing the same. [0002] In addition, the invention also relates to magneto-optical devices such as Faraday rotators and optical isolators. Background technique [0003] In recent years, with the development of laser processing machines, magneto-optical devices utilizing the interaction of light and magnetism have attracted attention. One of them is an isolator, which is a device that suppresses the phenomenon that when the oscillating light from the laser light source is reflected by the optical system on the way and returns to the light source, the oscillating light from the laser light source is disturbed and unstable state of oscillation. Therefore, to take advantage of this function, an optical isolator is disposed and used between the laser light source and the o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B35/50C01F17/00G02B27/28G02F1/09
CPCC04B2235/81C04B2235/3206C04B2235/3232C04B2235/3217C04B2235/664C04B2235/3852C04B35/6455C04B2235/762C04B2235/661C04B35/62685C04B2235/3224C04B2235/3287C04B2235/785G02F1/093C04B35/505C04B2235/3418C04B2235/9653C04B2235/3208C04B2235/3286C04B2235/3251C04B35/50C04B2235/786C04B35/645C04B2235/445C04B2235/3225C04B2235/3244G02F1/0036C04B2235/32
Inventor 牧川新二矢作晃池末明生
Owner SHIN ETSU CHEM CO LTD
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