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Home > Products > Filters > Shortpass Filters
Hot Mirrors
Hot mirror is a special optical thin film filter mainly used for reflecting infrared radiation (thermal radiation) and transmitting visible light, which is similar in function to IR cut filter, but with a slightly different design objective. It is widely used in projectors, photographic equipment, laser systems, etc. to prevent thermal infrared radiation from interfering with or damaging optical systems.
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| What are the properties of hot mirrors? | ||
| Parameter | Typical Value | Influence |
| Visible Transmittance | >90% (400-700nm) | Imaging brightness, color reproduction |
| Infrared Reflectivity | >95% (700-2500nm) | Thermal Management Effectiveness |
| AOI Range | 0°-45°(Affect the cut-off wavelength) | Reflective bands may be shifted when used at large angles |
| Substrate | BK7, Fused Silica | Temperature resistance, mechanical strength |
| Surface Quality | Flatness λ/4 S/D: <40-20 | Avoid scattering and ghosting |
| What is the difference between a hot mirror and an IR cut filter? | ||
| Feature | Hot Mirror | IR Cut Filter |
| Main Function | Reflects infrared light and transmits visible light | Absorbs or cuts off infrared light, transmits visible light |
| Working Principle | Multilayer dielectric coating reflection | Absorption (e.g. blue glass) or reflection + absorption |
| Thermal Management Capability | Strong (infrared light is reflected without heat buildup) | Weak (infrared light is absorbed and may heat up) |
| Typical Application | Projectors, laser systems, high temperature environmental optics | Cameras, security cameras, cell phone lenses |
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