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Glass for wavelength division multiplexing optical filter

A wavelength division multiplexing and optical filter technology, applied in optical filters, instruments, optics, etc., can solve problems such as small size, difficult to observe or notice, and increase production costs

Inactive Publication Date: 2004-01-14
CENT GLASS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

This step increases production costs
Furthermore, due to its small size (eg 1mm 2 ) and its colorlessness and transparency make it difficult to observe or notice the final product (filter substrate)

Method used

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  • Glass for wavelength division multiplexing optical filter
  • Glass for wavelength division multiplexing optical filter

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1-1 to 1-9 and comparative Embodiment 1-1 to 1-5

[0062] In each of these Examples and Comparative Examples, as shown in Tables 1 and 2, the raw materials of the glass composition (in the form of oxides, carbonates and nitrates and the like) were weighed and mixed together.

[0063] The resulting mixture was put into a 2000 ml platinum crucible (containing 10 wt % of rhodium), and then melted in an electric furnace at 1300° C. for 5 hours. The resulting glass melt was poured into a graphite mold, and then the mold was placed in an electric furnace previously maintained at about the glass transition temperature, and the mold was kept warm therein for 2 hours. Then, the mold was cooled to obtain a glass block (size: 30 mm (thickness)×200 mm×300 mm).

[0064] Then, the glass block is cut into thin slices, followed by grinding into a cylindrical shape, and then grinding both surfaces. Then, by alternately laminating Ta 2 o 5 layer and SiO 2 layer, thereby coating one abrasive surface of the wafer with a multilayer dielectric ...

Embodiment 2-1 to 2-6 and comparative Embodiment 2-1 to 2-5

[0072] In each of these Examples and Comparative Examples, Example 1-1 was repeated except that the chemical composition was modified as shown in Tables 3 and 4 and the modification evaluation test was described below.

[0073] Evaluation tests were carried out on the above-mentioned glass blocks to determine the average coefficient of thermal expansion, Young's modulus, glass transition point (Tg) and Vickers hardness (Hv) at 50-150°C. The results are shown in Tables 3 and 4. A water resistance test was performed in accordance with JIS R3502. Tables 3 and 4 show the Na 2 O is the amount of alkaline components extracted.

[0074] In Comparative Examples 2-3 and 2-4, vitrification did not occur, so evaluation tests were not performed.

[0075] Example

[0076] comparative example

[0077] Empty column: nothing added

Embodiment 3-1 to 3-7 and comparative Embodiment 3-1 to 3-9

[0079] In each of these Examples and Comparative Examples, Examples 1-1 were repeated, except that the chemical composition was modified as shown in Tables 5 and 6, the melting temperature was 1400°C instead of 1300°C, and the sex evaluation test.

[0080] In the same manner as those of Example 1-1, evaluation tests were carried out on the obtained glass blocks, and the average coefficient of thermal expansion and Young's modulus at 50-150° C. were determined. The results are shown in Tables 5 and 6.

[0081] The noticeability test was carried out on the obtained square substrate. In this test, the substrate was placed on a glass plate (30 mm in width) which had been subjected to a heat treatment similar to that of the multilayer dielectric film and the antireflection film. If the position of the substrate on the glass plate was noticed immediately, it was judged as "good"; and if not, it was judged as "bad". As shown in Tables 5 and 6, the color of the glass plates was rec...

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Abstract

The invention relates to first, second and third glasses for wavelength division multiplexing optical filters. The first glass contains 50-65 wt% of SiO2, 5-25 wt% of Na2O, 4-20 wt% of K2O, 0-20 wt% of CaO, 0-10 wt% of MgO, 0-10 wt% of BaO, 0-10 wt% of Al2O3, and 0-10 wt% of TiO2. The second glass contains 35-55 wt% of SiO2, 10-30 wt% of TiO2, 4-20 wt% of ZrO2, 5-25 wt% of Na2O, 0-10 wt% of Al2O3, 0-20 wt% of CeO2, 0-5 wt% of Li2O, 0-20 wt% of K2O, and 0-3wt% of at least one metal oxide selected from MgO, CaO, SrO, BaO, and ZnO. The third glass contains 35-55 wt% of SiO2, 0-20 wt% of Al2O3, 0-10 wt% of B2O3, 1-35 wt% of TiO2, 1-15 wt% of CeO2, 0-10 wt% of Li2O, 5-25 wt% of Na2O, and 0-20 wt% of K2O.

Description

Background of the invention [0001] The present invention relates to glass required to have a high coefficient of thermal expansion for use as a material of an optical filter for wavelength division multiplexing (WDM) in optical communications so that only certain predetermined wavelength ranges can pass. [0002] In general, optical filters can be classified into those that cut and emit certain predetermined wavelengths and those that reduce light transmittance. Examples of the former filter are (a) band-pass filters that emit only certain predetermined wavelengths, (b) notch-pass filters that cut only certain predetermined wavelengths, (c) ) a low-pass filter for emitting only wavelengths shorter than a specific wavelength, and (d) a high-pass filter for emitting only wavelengths longer than a specific wavelength. A typical example of the latter filter is an ND filter. [0003] In wavelength multiplexed optical communication, a bandpass filter is used to combine lights havi...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C03C3/076C03C3/095G02B5/22
CPCG02B5/226C03C3/095C03C3/076C03C4/08
Inventor 栗山延也
Owner CENT GLASS CO LTD