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Optical Design & Engineering

Borosilicate glass substrates


High quality functional coatings enable a large variety of customized light management design options - especially when based on a reliable substrate material such as BOROFLOAT® borosilicate glass. This flat glass from specialty glass expert SCHOTT is manufactured in a sophisticated float process and simultaneously offers convincing optical, thermal, mechanical and chemical properties. It is a well suited material for use in optical components such as dichroic filters or hot and cold mirrors that rely on high thermal resistance as well as on high energy radiation exposure capabilities.

Due to its unique glass microstructure with a relatively low amount of non-bridging oxygens, BOROFLOAT® glass shows a low degradation behavior at high intensity radiation exposure rates. This means that dichroic filters made of BOROFLOAT® glass often exhibit significantly better color filter characteristics (for instance steep UV cut-off performance, higher level of visible transmittance). Moreover, high laser and X-ray radiation damage threshold characteristics can contribute to longer lifetimes and better overall performance compared to other flat glass substrates under such challenging conditions.

The performance requirements for optical filters and mirrors are highly dependent on the material's ability to reflect, absorb, enhance or modify incoming light. This can be accomplished with bulk optical glass materials or through coatings that are applied to a pristine glass substrate. Coatings usually allow significantly more freedom for customized light management design options which can be developed even further when a flat glass material with outstanding optical, thermal, mechanical and chemical properties is used. BOROFLOAT® borosilicate glass is such a unique substrate and has hence become the material of choice for robust high-temperature resistant dichroic filters, hot and cold mirrors.