Dichroic Filters

Advanced Color Separation Through Precision Thin-Film Engineering

Dichroic Filters Andover Corporation

Andover Dichroic Filters

Superior color separation through advanced thin-film engineering

Dichroic filters are sophisticated optical components that selectively transmit certain wavelengths of light while reflecting others, using interference effects rather than absorption. They consist of precision-engineered thin layers of metallic oxides that create a hard dielectric coating, making them far more durable and heat-resistant than conventional absorption filters.

Key characteristics:

  • Spectral Separation: Sharp transition between transmitted and reflected wavelengths
  • Angular Dependence: Performance varies with angle of incidence
  • Temperature Stability: Maintains spectral properties across wide temperature ranges
  • Environmental Durability: Resistant to humidity and UV exposure

Andover Corporation manufactures dichroic filters using state-of-the-art deposition technologies and quality control processes. Our filters are available in standard configurations for common color separation needs, as well as custom designs optimized for specific applications requiring precise spectral control or unique environmental requirements.

Shop Dichroic Filters

Dichroic Filter Construction Technologies

Andover Corporation manufactures dichroic filters using two primary construction approaches to meet diverse application requirements:

Hard Oxide Dielectric Construction

  • Multiple alternating layers of high and low refractive index materials
  • Precision-controlled layer thicknesses for sharp spectral transitions
  • Superior environmental stability and durability
  • Ideal for high-power applications requiring minimal absorption
  • Operating temperature capability up to 200°C

Enhanced Metal-Dielectric Hybrid

  • Combines metallic and dielectric layers for specialized performance
  • Excellent out-of-band blocking characteristics
  • Enhanced angle tolerance for non-normal incidence applications
  • Optimized for UV and deep blue wavelengths
  • Superior polarization properties
Andover's extensive experience in thin-film coating technology enables us to provide both standard and custom dichroic solutions that meet demanding spectral and environmental specifications while maintaining excellent long-term stability.

Precision Color Control: Dichroic Solutions

Engineered Wavelength Separation for Advanced Optical Systems

Andover Corporation's dichroic filters represent the pinnacle of thin-film coating technology, combining precise spectral control with exceptional environmental durability. Our advanced deposition processes and rigorous quality control ensure outstanding performance across applications from cutting-edge fluorescence microscopy to demanding aerospace systems. Each filter undergoes comprehensive testing to verify spectral accuracy, surface quality, and mechanical stability.

Color Additive Filters

Designed for precision color separation in additive applications, these filters provide sharp cutoff and high transmission in specific spectral bands.
  • Blue Filter T: 80% Avg 390-480nm, R: 99% Avg 540-750nm
  • Green Filter R: 99% Avg 380-460nm & 600-730nm, T: 85% Min at 540nm
  • Red Filter R: 99% Avg 370-550nm, T: 80% Avg 610-730nm
  • Thickness 1.0mm ±0.25mm
  • Operating Temperature +200°C max
High Transmission
Sharp Cutoff
Temperature Stable

Reflective Filters

Specialized 45° angle filters optimized for beam splitting and combining applications requiring high reflection efficiency.
  • Blue Reflective R: 90% Avg 380-450nm, T: 85% Avg 525-800nm
  • Red Reflective T: 85% Avg 400-550nm, R: 90% Avg 610-725nm
  • Substrate Material Soda lime glass
  • Flatness 3-5 waves per 25mm
  • Parallelism 3 arc minutes or better
45° Optimized
High Reflection
Precision Optics

Color Subtractive Filters

Optimized for subtractive color applications requiring high reflection efficiency and excellent color purity.
  • Cyan Filter T: 80% Avg 400-550nm, R: 99% Avg 640-740nm
  • Magenta Filter T: 80% Avg 380-475nm & 650-750nm, R: 99% Avg 535-565nm
  • Yellow Filter R: 99% Avg 410-475nm, T: 85% Avg 550-750nm
  • Surface Quality 80/50 per MIL-C-48497A
  • Humidity Resistance Per MIL-C-48497A
High Color Purity
Environmental Stable
Precise Color Separation

Frequently Asked Questions

What is a dichroic filter?
How do dichroic filters differ from traditional color filters?
What are the main types of dichroic filters offered by Andover Corporation?
In which applications are dichroic filters commonly used?
How does the angle of incidence affect dichroic filter performance?
Can Andover Corporation provide custom dichroic filters?

From Prototype to Production

Custom Fabrication and High-Volume Manufacturing

Our vertically integrated facility handles both specialized custom projects and large-scale production runs with consistent quality and short lead times.
Find Global Distributor
Request a Quote

Markets

LiDAR Optical Filters for Remote Sensing and Mapping

Semiconductor & Advanced Manufacturing

Machine Vision & Industrial Automation

Military & Defense Systems

Biomedical & Life Sciences

Aerospace & Space Optics | Andover

Astronomy & Space

Quality isn't just a metric

- it's our foundation.

0 %
On-Time Delivery Rate
Delivering Precision, On Schedule
0.5 %
Return Rate
Industry-leading quality
0 %
Traceability
Complete documentation
ISO 9001:2015

ISO 9001:2015

Quality Management

 AS9100:2016

AS9100:2016

Aerospace Standard

 ITAR Registered

ITAR Registered

Defense Compliance

Andover Insights & Innovations

Discovering new possibilities in optical filtering

A mesmerizing, prismatic view through a teleidoscope, showcasing a kaleidoscopic pattern of vibrant, refracted light. The intricate geometric reflections create a dynamic interplay of colors, with crystalline shapes forming a symmetrical, ever-shifting optical display. Unlike a traditional kaleidoscope, a teleidoscope transforms real-world scenes into abstract patterns using an optical lens and mirrors, making it a fascinating optical instrument for exploring symmetry and light refraction.

Celebrating Pride Month: Honoring John Burnside’s Legacy of Innovation

By Rick Shagoury | June 1, 2024

Explore the remarkable journey of optical pioneer John Burnside and his contributions to science, activism, and LGBTQ+ rights.

A high-altitude astronomical observatory dome at Mauna Kea, Hawaii, surrounded by clouds during a stunning sunset. The facility houses advanced telescopes used for deep-space exploration and astrophotography, taking advantage of the location’s clear skies and stable atmospheric conditions.

Celebrating AAPI Heritage Through Science and Culture

By Rick Shagoury | May 15, 2024

Explore the cultural significance of Mauna Kea Observatory during AAPI Heritage Month, honoring the contributions of AAPI scientists and optical engineers.

A collection of red-tinted chalcogenide glass optics, including circular, square, and cylindrical components, sourced from SCHOTT North America. These infrared optical materials are used in advanced optical systems for defense, aerospace, and industrial applications. Chalcogenide glass provides superior infrared transmission and thermal stability, making it a valuable alternative to germanium for IR optics.

Chalcogenide Glass: Advancing Optical Innovation in Defense

By Rick Shagoury | April 22, 2024

Discover the advantages of chalcogenide glasses in optical filters, and their wide range of applications for defense, thermal imaging, and more.

Contact Our Team

Ready to discuss your optical needs? Whether you're looking for a quote or have technical questions, our expert team is here to help guide you to the perfect solution.

Request a Quote
Questions?
Call Us Directly