Lithium silicate materials are described which can be easily processed by machining to dental products without undue wear of the tools.

Lithium silicate materials are described which can be easily processed by machining to dental products without undue wear of the tools.

Optical glass, a preparation method thereof, a backlight module and a display module. The optical glass comprises a glass substrate and optical masterbatches, which are dispersed in the glass substrate, each optical masterbatch comprises a quantum dot fluorescent agent inner core and an encapsulation shell which encloses the quantum dot fluorescent agent inner core. A quantum dot fluorescent agent is protected by the encapsulation shell and the luminous efficiency is high; when the optical glass is applied to a display module, the color gamut may be improved; moreover, the glass is capable of preventing against the invasion of water vapor, even the quantum dot fluorescent agent at an edge of the glass rarely fails, and an edge failure size is basically avoided; meanwhile, the expansion coefficient is small, and an expansion space reserved during assembly is extremely small.

Optical glass, a preparation method thereof, a backlight module and a display module. The optical glass comprises a glass substrate and optical masterbatches, which are dispersed in the glass substrate, each optical masterbatch comprises a quantum dot fluorescent agent inner core and an encapsulation shell which encloses the quantum dot fluorescent agent inner core. A quantum dot fluorescent agent is protected by the encapsulation shell and the luminous efficiency is high; when the optical glass is applied to a display module, the color gamut may be improved; moreover, the glass is capable of preventing against the invasion of water vapor, even the quantum dot fluorescent agent at an edge of the glass rarely fails, and an edge failure size is basically avoided; meanwhile, the expansion coefficient is small, and an expansion space reserved during assembly is extremely small.

A composition for glass, alkaline earth aluminosilicate glass, and a preparation method therefor and applications thereof. Based on the total number of moles of each component and the counting of oxides, the composition contains 68-73 mol % of SiO.sub.2, 11.5-15 mol % of Al.sub.2O.sub.3, 2-6 mol % of MgO, 2.5-7.5 mol % of CaO, 0-3 mol % of SrO, 2-7 mol % of BaO, 0-4 mol % of ZnO and 0.05-1.5 mol % of TiO.sub.2. The glass has a high strain point, a high Young's modulus, a high specific modulus, a high Vickers hardness, high chemical stability, a high refractive index and high glass formation stability, and has a lower forming temperature, a lower melting temperature, a lower thermal expansion coefficient, a lower surface tension, a lower density, and low glass manufacturing difficulty.

A method of manufacturing an optical multiplexer, whereby one molded product is formed by using a mold and vertically cut in a row direction, thus efficiently manufacturing multiple optical multiplexers, with a microlens array and an optical block being integrated together. Therefore, the present invention may increase product productivity and realize a size reduction of a product.

A method of manufacturing an optical multiplexer, whereby one molded product is formed by using a mold and vertically cut in a row direction, thus efficiently manufacturing multiple optical multiplexers, with a microlens array and an optical block being integrated together. Therefore, the present invention may increase product productivity and realize a size reduction of a product.

A quartz glass crucible 1 having a cylindrical side wall portion 10a, a bottom portion 10b, and a corner portion 10c connecting the side wall portion 10a and the bottom portion 10b to each other includes a transparent layer 11 made of quartz glass, and a bubble layer 12 made of quartz glass and formed outside the transparent layer 11. A ratio of an infrared transmittance of the corner portion 10c at a maximum thickness position of the corner portion 10c to an infrared transmittance of the side wall portion 10a is 0.3 or more and 0.99 or less, and an absolute value of a rate of change in infrared transmittance in a height direction along a wall surface of the crucible from a center of the bottom portion 10b toward an upper end of the side wall portion 10a is 3%/cm or less.

Provided is a small-diameter chalcogenide glass material having excellent weather resistance and mechanical strength and being suitable as an optical element for an infrared sensor. The chalcogenide glass material has an unpolished side surface, a pillar shape with a diameter of 15 mm or less, and a composition of, in terms of % by mole, 40 to 90% S+Se+Te and an inside of the glass material is free of stria with a length of 500 μm or more.

An optical multiplexer (MUX) according to an embodiment of the present disclosure includes a base part having a plate-shape having a first surface and a second surface opposite to the first surface, a microarray lens layer integrally formed on the first surface of the base part, the microarray lens layer including microlens layers being multiple aspherical surface-shaped, and multiple optical blocks integrally formed on the second surface of the base part and formed at respective positions corresponding to the microlens layers.