Hot and Cold Mirrors

Hot Mirrors are used in applications when there is the requirement to separate visible light from heat. The hot mirror accomplishes this by reflecting the heat. The use of Borosilicate type glass allows operation in high temperatures. Operation at an AOI of 0º is preferred. The most common wavelength range for an average transmission of 85% through the hot mirror is 420 – 700nm. The reflective range for the hot mirror for R>95% is 800 – 1000nm. Additionally, R>50% from 735 – 1080nm.

Cold Mirrors are used where the requirements are to reflect visible light and remove the heat by transmission. Operation at an AOI of 45º is preferred. The most common wavelength range for transmission through the cold mirror is 800 – 1200nm. The average transmission range is T>85%. Additionally, R>95% for 400 – 700nm.

Type Model AOI Price
Cold MC0-25.4 0 $50
MC0-50.8 0 $61
MC45-24.4 45 $50
MC45-50.8 45 $61
Hot MC0-25.4 0 $53
MC0-50.8 0 $79
MC45-24.4 45 $54
MC45-50.8 45 $72

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Features of Hot Mirrors

. High transmission for the visible range
. High reflection for infrared
. Removes heat
. Uses Borofloat® type glass
. Dielectric Coating
. AOI’s of 0º or 45º
. Custom mirrors to your configuration

Features of Cold Mirrors

. High reflection for the visible range
. High transmission for infrared

Typical Specifications – Hot Mirrors

Material: Borosilicate type Glass
Size: 15mm to 300mm
Thickness: 3.3mm
Mirror coating: Dielectric multilayer
Transmission: Tave>85% for 425 – 700nm
Reflection: Rave>90% for750 – 1050nm
Surface Finish: 80-50
Flatness: ?/2 @633nm per inch
Protective Bevel: 0.3mm x 45º


Typical Specifications – Cold Mirrors

Material: Borosilicate type Glass
Size: 15mm to 300mm
Thickness: 3.3mm
Mirror coating: Dielectric multilayer
Transmission: Tave>85% for 750 – 1000nm
Reflection: Rave>90% for400 – 700nm
Surface Finish: 80-50
Flatness: ?/2 @633nm per inch
Protective Bevel: 0.3mm x 45º


We make custom versions of everything on this site. Send us your drawings or specifications and we will provide a quotation.