Dichroic Filters

KUPO Optics proudly presents its exquisite range of Dichroic Filters, a marvel in the world of optical engineering. These filters, expertly coated with hard dielectric thin-films, stand as a testament to our commitment to precision and quality. Crafted to filter out unwanted regions of the visible spectrum, these dichroic filters allow only specific wavelengths to pass through, creating a palette of pure, intense, and true-to-life colors. This unique capability makes them an indispensable tool in applications that demand precise control over light and color.
Utilizing advanced Ion Assistant Deposition (IAD) and a state-of-the-art planetary-running coating machine, KUPO ensures that each thin-film layer is evenly and firmly attached to the glass substrates. This meticulous process guarantees unmatched consistency in optical specifications across different pieces and batches, ensuring that each filter performs to the highest standards. The high-density coating not only enhances the color vibrancy but also significantly boosts the filters’ resistance to UV, heat, and environmental degradation, far surpassing the durability of traditional gel filters.
From the grandeur of stage lighting to the precision of fluorescence microscopy, KUPO’s Dichroic Filters find their place in a diverse array of settings, including architectural lighting and advanced projection systems. With a spectrum of over 70 colors to choose from and the option for custom color development, these filters offer unparalleled flexibility to meet the specific needs of any project. Adhering to the rigorous MIL-M-13508C standards, KUPO Optics ensures that each filter is not just a component, but a reliable, enduring element in your optical solutions.
KUPO Dichroic/ Master of Wavelength Control


● Perfect piece-to-piece, batch-to-batch consistency
● Pure, intense, true-to-life color
● Great resistance against UV and heat (Compared to gel)
● Great endurance to environmental degradation

Examples of Application

● Stage Lighting
● Architectural Lighting
● Projection System
● Fluorescence Microscopy

General Specification

● Spectral Tolerance: +/-3nmat T50%
● Available Substrate: See Glass Substrates under Products Page
● Humidity, Adhesion, and Abrasion: MIL-M-13508C



The Applications of Dichroic Filters 

Dichroic filters are specialized optical components that selectively transmit light of a small range of colors while reflecting other colors. Their precise color control, high durability, and thermal stability make them highly beneficial in a variety of applications spanning across industries such as machine vision, stage lighting, medical devices, microscopy, and astronomy. These filters play a pivotal role in enhancing performance, accuracy, and visual effects by manipulating light with exceptional precision.
Machine Vision
In the realm of machine vision, dichroic filters serve an essential role in improving the contrast and resolution of the images captured by cameras and sensors. Their ability to transmit specific wavelengths while blocking others makes them ideal for color sorting, inspection systems, and quality control processes.
Manufacturers use dichroic filters in conjunction with monochrome or color cameras to isolate the light reflecting off the objects being inspected. This allows for more accurate color detection and differentiation, crucial in automation and robotic applications where precision is paramount. For instance, in the food industry, these filters aid in separating items based on color or identifying contaminants, enhancing both sensitivity and specificity of the vision system.
Stage Lighting
Dichroic filters have revolutionized the stage lighting industry by providing lighting designers with an array of tools for color control. Unlike traditional gels, these filters can endure high heat and intensity levels emitted by powerful stage lights, making them ideal for theatrical and performance environments.
Their use in stage lighting involves altering the hue and temperature of the projected light without a significant loss of intensity. This is due to their efficient reflection of unneeded wavelengths while transmitting the desired color spectrum. The result is a vibrant and stable color output that can transform the ambiance and elevate the audience's experience. Furthermore, their longevity reduces the need for frequent replacements, offering a cost-effective solution for performance venues.
Medical Devices
In the medical sector, dichroic filters are employed in a range of diagnostic and therapeutic devices. Their precision in transmitting specific wavelengths is critical for various applications including endoscopy, ophthalmology, and in fluorescence-based assays, where they help in the identification of markers or tissues by selectively illuminating and filtering light.
For example, in fluorescence microscopy, dichroic filters are a key component of the imaging chain. They work alongside excitation filters and emission filters to ensure that only light from the fluorescence emission reaches the detection system, thereby enhancing image contrast and clarity for better diagnosis and research outcomes.
Dichroic filters find extensive applications in microscopy, particularly in the fields of fluorescence and multi-photon microscopy. By precisely separating incoming and emitted light, they are crucial in the observation of fluorescently labeled specimens.
They are integrated into microscope filter cubes where they serve as beam-splitters to reflect excitation light towards the specimen while allowing emitted fluorescence to pass through to the detector. Their high durability and ability to withstand intense light sources without degradation are essential for long-term research and analysis in life sciences and material studies.
Astronomy greatly benefits from the use of dichroic filters for observing celestial bodies. By filtering out unwanted wavelengths, astronomers can focus on specific spectral lines or bands, making it easier to study the composition, temperature, and motion of stars and galaxies.
Whether used in professional observatories or in amateur telescopes, dichroic filters assist in reducing the effects of light pollution and enhancing the contrast of observed objects against the night sky. For instance, in spectroscopy, they are vital for splitting starlight into its constituent colors for detailed analysis.
Dichroic filters, with their unique optical properties, have opened new possibilities in various industry sectors. Their precise light manipulation capabilities lead to advancements in technology, arts, and science, forging a path for innovative applications and enhanced experiences. From improving the accuracy of machine vision systems to enriching the spectacle of stage lighting, the diversity of dichroic filter applications underscores their importance as a modern-day optical solution.