High-contrast lead-free pair of soft glasses for large numerical aperture imaging bundles

Development of high numerical aperture fiber bundles (FBs) requires use of thermally matched pair of glasses with a high difference of refractive indices. We have developed a pair of glasses with high refractive index contrast Δn D >0.2, suitable for fabrication of optical fiber bundles with nume...

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Bibliographic Details
Published in:Optical materials express 2020-08, Vol.10 (8), p.1891
Main Authors: Stepien, Ryszard, Cimek, Jaroslaw, Pysz, Dariusz, Kujawa, Ireneusz, Golebiewski, Przemyslaw, Stepniewski, Grzegorz, Orlinski, Krzysztof, Buczynski, Ryszard, Kasztelanic, Rafal
Format: Article
Language:English
Subjects:
Aluminum oxide
Aperture imaging
Barium oxides
Boron oxides
Borosilicate glass
Bundles
Bundling
Crystallization
Fluorescence
Lanthanum
Lanthanum oxides
Lead free
Microscopes
Niobium oxides
Numerical aperture
Optical fibers
Refractivity
Silicon dioxide
Tantalum
Tantalum oxides
Thermal stability
Zirconium dioxide
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Summary:Development of high numerical aperture fiber bundles (FBs) requires use of thermally matched pair of glasses with a high difference of refractive indices. We have developed a pair of glasses with high refractive index contrast Δn D >0.2, suitable for fabrication of optical fiber bundles with numerical aperture NA > 0.85. Core glass was synthetized in the lanthanum oxide system Nb 2 O 5 -Ta 2 O 5 -SiO 2 -ZrO 2 -B 2 O 3 -Al 2 O 3 -La 2 O 3 -BaO-SrO. Borosilicate glass synthetized in oxide system SiO 2 -Al 2 O 3 -B 2 O 3 -MgO-CaO-Na 2 O-K 2 O, thermally matched to the core glass, is used for the fiber cladding. The glasses also have high transmission from 350 to over 600 nm, which makes them ideal for fluorescence imaging applications. These thermally stable, crystallization-free lanthanum and borosilicate glasses have been successfully applied to development of proof-of-concept large diameter optical fiber.
ISSN:2159-3930
2159-3930
DOI:10.1364/OME.394918