Low-cost sapphire windows

Gentilman, Richard L.; McGuire, Patrick Timothy; Fiore, Daniel; Ostreicher, Kim; Askinazi, Joel

doi:10.1117/12.488241

Cited by 4 publications

(2 citation statements)

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“…The fired glass coating can be polished if required using conventional polishing methods which are very cheap. The feasibility of coating a hard inorganic material such as sapphire with a lead-based glass frit was demonstrated on small tiles [1] and on large area windows which were coated and bonded with glass [2]. The selection criteria for the glass compositions used for coating in the cited above works were index of refraction and probably linear coefficient of expansion matching to the ceramic substrate.…”

Section: Introductionmentioning

confidence: 99%

Glass Composition for Coating and Bonding of Polycrystalline Spinel Ceramic Substrates

Hormadaly

2024

Ceramics

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Design considerations of the lead-based glass composition was broadened beyond the two known criteria of matched index of refraction and thermal coefficient of expansion to include previous studies of thick film materials. Five criteria for the glass-design composition were used: matched index of refraction and thermal coefficient of expansion, components (MgO and Al2O3) to slow down dissolution of spinel (MgAl2O4) into the glass, non-crystallizing glass in a broad temperature range and glass with good chemical durability. Synthesis and characterization of glass, glass paste preparation and its application to spinel substrates to form coating and bonding and optical characterizations in the UV, VIS and IR of coated, uncoated, and bonded spinel substrates of two commercial sources are described. Enhancement of transmittance exceeding the theoretical value of polished spinel was found for the first time when glass coating was applied to a ground face of semi-polished spinel.

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Section: Introductionmentioning

confidence: 99%

Glass Composition for Coating and Bonding of Polycrystalline Spinel Ceramic Substrates

Hormadaly

2024

Ceramics

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“…Large size and high quality sapphire crystals have been widely used as military optical window and GaN‐based semiconductor device substrate 1–3. However, the presence of crystal defects in sapphire, such as dislocation and bubble, would influence its optical transmission, mechanical strength, and as‐grown GaN epitaxial film quality 4.…”

Section: Introductionmentioning

confidence: 99%

Synchrotron X‐ray diffraction studies of large sapphire crystal grown by Kyropoulos‐like method

Wang

Zhang

Wu³

et al. 2010

Physica Status Solidi (a)

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In this paper, monochromatic double‐crystal X‐ray diffraction and white‐beam X‐ray topography techniques using synchrotron radiation source were utilized to investigate the growth process of large sapphire crystal by an improved Kyropoulos‐like method. Compared with the calculated theoretical value of 8.6 s, FWHM experimental values of sapphire are in the range of 11 ∼ 26 s, showing its good crystalline perfection in general, especially for the crystal in the central region of the boule. The analysis of white beam transmission X‐ray topographs revealed the presence of dislocation tangles and helical dislocations in different crystal regions. The defect configurations in sapphire crystals were caused by the dislocation reaction and void formation.

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