Cold Mirrors

KUPO Optics presents its state-of-the-art Cold Mirrors, a masterpiece in optical engineering, designed to redefine the manipulation of light in sophisticated applications. These mirrors are crafted with precision to reflect visible light efficiently while allowing near-infrared (NIR) light to pass through seamlessly. The distinct multi-layer coating of these mirrors plays a pivotal role in separating visible light from NIR, a feature crucial in applications where heat management is as vital as illumination.
The impeccable design of KUPO's Cold Mirrors ensures that they offer exceptional visible light reflection, an attribute that is essential in applications ranging from medical illumination to high-precision scanning devices. In medical settings, these mirrors provide robust illumination without the unwanted heat usually associated with NIR, ensuring patient comfort and safety. In surveillance systems, they effectively filter out NIR, thus mitigating the heat effect on camera sensors and enhancing the longevity and reliability of these critical security devices.
KUPO Optics' commitment to consistency is evident in every Cold Mirror produced, with a rigorous adherence to MIL-M-13508C standards for humidity, adhesion, and abrasion resistance. This consistency ensures that each mirror, from one batch to the next, maintains the same high standards of quality and performance. Ideal for reflectors in optical systems and scanners where overheating is a concern, KUPO Optics’ Cold Mirrors offer a perfect blend of functionality, reliability, and technological sophistication, making them an indispensable tool in a wide array of advanced optical applications. 

The Applications of Cold Mirrors

Cold mirrors are optical devices designed to efficiently reflect visible light while transmitting infrared radiation, offering innovative ways to manage heat across numerous applications. These components are particularly useful where light needs to be separated from heat, or where heat dissipation is a concern. From enhancing lighting systems to protecting sensitive equipment, cold mirrors have become essential in industries such as machine vision, stage lighting, medical equipment, laser systems, and more.
Machine Vision
In machine vision, accuracy and consistency in imaging are paramount. Cold mirrors help in reducing heat transferred to the camera sensors, which can distort images or affect camera performance over time. They are often used to direct visible light towards the object being imaged while allowing the heat-generating infrared radiation to pass through and be dissipated, ensuring the system retains its accuracy during prolonged use.
Stage Lighting
Cold mirrors are critical in stage lighting, where they are used to direct bright, visible light towards the stage without the accompanying infrared energy that generates heat. This ensures that performers, artwork, or set pieces are illuminated without being subjected to heat that could cause discomfort, damage, or fading. It also allows for cooler operation of lighting equipment, requiring less cooling and fewer interruptions for maintenance.
Medical Equipment
Certain medical imaging and therapeutic devices demand cold mirrors to provide intense light without the heat, which could cause patient discomfort or tissue damage. By filtering out infrared radiation, cold mirrors ensure medical professionals can illuminate the target area with minimal heat transmission, leading to better patient outcomes and comfort during medical procedures.
Laser Systems
In laser systems that operate in the visible spectrum, cold mirrors can separate unwanted infrared radiation from the operational wavelengths, preventing heat buildup in the equipment or on the target surface. This is crucial when the precise application of laser energy is needed, such as in surgical lasers or material processing where control over the temperature is as important as the accuracy of the laser beam.
Digital Projection
Projectors require high-intensity light for bright images, which often leads to considerable heat generation. Cold mirrors reflect the visible light used to create the image while allowing the infrared heat to pass through, reducing the thermal load on projection components. This prolongs the life of the projector and helps maintain image quality over time.
Scientific Research
In scientific applications such as spectroscopy, microscopy, and other laboratory instruments, cold mirrors enable researchers to direct visible light to detectors or samples while mitigating the thermal influence of infrared radiation. This separation is essential for experiments that are sensitive to temperature fluctuations or for protecting delicate samples that could be damaged by heat.
Art Preservation
Museums and art galleries use cold mirrors to illuminate artworks with minimal heat exposure. Reducing the infrared allows these treasures to be displayed under appropriate lighting without risking degradation caused by heat, ensuring they can be enjoyed by future generations while maintaining their integrity and appearance.
Photographers use cold mirrors to control the lighting of their subjects. By reducing the infrared radiation, they can manage the heat impact on both the photographic subject and the equipment, which is particularly useful in close-up or macro photography, where the lighting is often intense and in close proximity to the subject.
Cold mirrors represent an innovation in optical technology with widespread and practical uses across multiple fields. Their unique properties help address the need for clear, brilliant lighting without the detrimental effects of heat, blending utility with performance. Whether improving the precision of machine vision or preserving the priceless artwork, cold mirrors are proving to be indispensable tools for professionals requiring effective thermal management in their illumination solutions.
KUPO Dichroic/ Cold Mirrors


● Perfect piece-to-piece, batch-to-batch consistency
● Excellent visible light transmission
● Visible light reflection

Examples of Applications

● Medical Illumination
● Surveillance Camera
● Reflector
● Scanner

General Specification

● Spectral Tolerance: +/- 10nm at designated wavelength
● Available Substrate: See Glass Substrates under Products Page
● Humidity, Adhesion, and Abrasion: MIL-M-13508C