Cold Mirrors

A Cold Mirror is the inverse of the Hot Mirror, it reflects the visible and transmits the infrared. Their coatings are all first-surface variety and like the hot mirrors, are also deposited onto low expansion material such as borosilicate glass. These mirrors are usually used at a 45° angle of incidence in randomly polarized light.

Cold Mirror General Specifications

Thickness: 3.0mm ±0.5mm
Size Tolerance: +0.0mm/-0.5mm
Min. Clear Aperture: 95% of outside dimension
Substrate Material: Borosilicate glass
Flatness: 5–10 waves per 25mm
Parallelism: 3 arc minutes or better
Surface Quality: 80/50 per MIL-O-13830
Humidity and Abrasion: Per MIL-C-675A
Max. Operating Temperature: +200°C
Mechanical: Unmounted 

     

DESCRIPTION PART NO. 1-5 pcs. >5 pcs. QTY IN STOCK QTY
+ Cold Mirror, 25mm diameter x 3mm thick 645FK84-25 $40 $38 4
Filter Type Cold Mirror
Transmission 85% average from 800 to 1200nm
Reflection
Size 25.0 +0/-0.5mm
Thickness 3.0 +0.5/-0.5 mm
Operating Temp. (°C.) +200 max.
QtyPrice
1-5 $40
6+ $38
Estimated delivery: 1-2 days.
Note: Always free ground shipping on all domestic orders.
+ Cold Mirror, 50mm diameter x 3mm thick 645FK84-50 $59 $56 3
Filter Type Cold Mirror
Transmission 85% average from 800 to 1200nm
Reflection
Size 50.0 +0/-0.5mm
Thickness 3.0 +0.5/-0.5 mm
Operating Temp. (°C.) +200 max.
QtyPrice
1-5 $59
6+ $56
Estimated delivery: 1-2 days.
Note: Always free ground shipping on all domestic orders.
+ Cold Mirror, 50mm x 50mm x 3mm thick 645FK84-50S $67 $64 6
Filter Type Cold Mirror
Transmission 85% average from 800 to 1200nm
Reflection
Size 50.0 x 50.0 +0/-0.5mm
Thickness 3.0 +0.5/-0.5 mm
Operating Temp. (°C.) +200 max.
QtyPrice
1-5 $67
6+ $64
Estimated delivery: 1-2 days.
Note: Always free ground shipping on all domestic orders.