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Knight Optical(UK) Ltd - - +44 (0)1622 859444

Heat glass filters

What are you looking for in Stock?

Hot mirrors is a generic term used to describe IR reflecting filters that are typically found in temperature sensitive applications. The multilayer dielectric coating allows visible light to be transmitted at 0° AOI while reflecting NIR wavelengths up to 1150nm. The reduces the amount of heat entering a system and protects sensitive parts.

Our stock hot mirrors are coated on either 3.3mm borosilicate or 3.0mm KG1 substrates. As a rule, borosilicate's improved resistance to thermal expansion and thermal shock makes it a superior material when the light source is focussed close to the filter but the material also transmits highly above 1200nm. KG1 glass offers high blocking up to 3000nm and beyond. Our stock KG1 filters are thermally toughened to improve resistance to cracking.

Knight Optical also offers custom hot mirrors in standard borosilicate, fused silica and KG glass to suit your wavelength requirements. Alternatively, existing stock filters can be edged or cut to size in house for a fast turn around.

For more information on individual stock ranges please click on the links below. To enquire about our custom capabilities, or to place a custom order, contact our technical sales team.


Get a Custom Quote

Get in touch

Our Multi-Lingual Sales Team are here to help with your requirments:

UK +44 (0)1622 859444
UK +44 (0)1622 850614
UK +44 (0)1622 851078
+1 401 583 7846

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We are able to ship to most countries at good rates, please click here for more info.

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