Laser Zone Melting and microstructure of waveguide coatings obtained on soda‐lime glass

This study presents a Laser Zone Melting method with potential for producing planar waveguides at large scale, based on the surface coupling of two chemically compatible glass layers which exhibit distinct indices of refraction. The method is based on a recent patent, particularly applicable to proc...

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Bibliographic Details
Published in:International journal of applied glass science 2017-09, Vol.8 (3), p.329-336
Main Authors: Rey‐García, Francisco, Flores‐Arias, María T., Estepa, Luis C., Assenmacher, Wilfried, Mader, Werner, Fuente, German F.
Format: Article
Language:English
Subjects:
Ceramic coatings
characterization
coatings
Diffusion coatings
electron microscopy
fabrication
Glass coatings
Glass substrates
Laser beams
Lasers
microstructure
optical
Planar waveguides
Refraction
secondary processing
Shock resistance
Soda-lime glass
structure
Thermal resistance
Thermal shock
Transmission electron microscopy
waveguides
Zone melting
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Summary:This study presents a Laser Zone Melting method with potential for producing planar waveguides at large scale, based on the surface coupling of two chemically compatible glass layers which exhibit distinct indices of refraction. The method is based on a recent patent, particularly applicable to process glass and ceramics with low thermal shock resistance. Glass coatings containing 76.24% by weight PbO are thus here reported, as obtained by this method on commercial soda‐lime planar glass substrates. Their higher indices of refraction (1.58 vs 1.52 for commercial soda‐lime glass) result in attractive waveguiding potential, as demonstrated with measurements using focused light from a He‐Ne laser beam. Scanning and transmission electron microscopy studies reveal excellent integration and compatibility between the observed coatings and substrates, where diffusion in the proximity of the interface was studied by EDS analysis. Crystalline phases have not been found within the coating, or within the substrate, as concluded from the absence of Bragg‐peaks in XRD experiments.
ISSN:2041-1286
2041-1294
DOI:10.1111/ijag.12267