Heat control filters
from AndoverA combination of hot and cold mirrors can essentially eliminate 99% of the radiation generated by high-power illumination systems. The cold mirror, mounted at a 45° angle of incidence, transmits much of the heat while reflecting the visible light. The hot mirror, mounted perpendicular to the light beam, reflects the remaining heat while transmitting 90% of the visible light.
- Cold mirrors transmit near-IR and reflect visible light
- Hot mirrors reflect near-IR and transmit visible light
- Together, they effectively cool high-power illumination systems
Specifications
General Specification | |
---|---|
Thickness | 3.0±0.5 mm (6.0±0.5 mm for IR Suppressing) |
Size Tolerance | +0.0/-0.5 mm |
Min. Clear Aperture | 95% of outside dimension |
Substrate Material | Borosilicate glass |
Flatness | 5-10 waves per 25 mm |
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 (+100 °C for IR suppressing) |
Mechanical | Unmounted |
Optional | Mounted in threaded ring - contact our expert on the right for thread sizes |
All filters are available in 12.5, 25.0, 50.0 mm Ø and 50.0 mm SQ.
Filter Type | Part Number | Transmission Curve |
---|---|---|
Hot Mirrors | ||
Hot mirrors are heat-reflecting filters designed to transmit visible wavelengths and reflect near-infrared heat-generating wavelengths. Andover's hot mirrors have hard, first-surface dielectric coatings that meet or exceed the humidity and abrasion specifications listed above. The coatings are deposited onto a low-expansion material such as borosilicate glass to prevent cracking or crazing from high heat applications | 775FW82 | ![]() |
Ultraviolet Cold Mirrors | ||
Ultraviolet mirrors differ slightly from the standard cold mirror in that they reflect the ultraviolet and transmit the visible and infrared. They are excellent for applications that call for separating the ultraviolet from the visible and near infrared. | 375FV86 | ![]() |
Cold Mirrors | ||
Cold mirrors are heat-transmitting filters designed to reflect visible wavelengths and transmit near-infrared wavelengths. Andover’s cold mirrors have first-surface coatings that are deposited onto a low-expansion material such as borosilicate glass. | 645FK84 | ![]() |
850 nm Cold Mirrors | ||
This version of the cold mirror is identical to the standard cold mirror, but with the reflection range extended to 850nm. It has excellent transmission throughout the NIR region. | 850FK84 | ![]() |
Infrared Suppressing Filters | ||
These filters extend the blocking of standard hot mirrors across the infrared range using a combination of reflection from the dielectric stack and absorption from an infrared-absorbing filter glass. Because of this absorption factor, these filters are suitable only in low-power applications with a maximum filter temperature of 100°C. | 800FB72 | ![]() |
Applications
Surgical and dental
Scientific instruments
Lighting
Film and photographic apparatus
Illumination systems
Projection Systems
Photocopiers
Film and Photographic Apparatus
Contact

Jörg
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Contact
Quantum Design GmbH
Breitwieserweg 9
64319 Pfungstadt
Germany
Phone: | +49 6157 80710-0 |
E-mail: | germanyqd-europe.com |