Bandpass Filters

Precision wavelength selection from 193nm to 14μm

Bandpass Filters Andover Corporation

Andover Bandpass Filters

Precision light control, from UV to IR, in one elegant solution

Bandpass filters are one of the most effective and economical solutions for isolating specific wavelengths of light while blocking all others. Like their name suggests, they act as selective gates - allowing a precise "band" of wavelengths to pass through while rejecting everything else. Each filter is defined by three key characteristics:

  • Center Wavelength (CWL): The central wavelength the filter is designed to transmit
  • Bandwidth (FWHM): The width of the transmitted band, measured at 50% of peak transmission
  • Peak Transmission (T): The maximum transmission level achieved

Andover Corporation offers multiple construction variations of these filters, each optimized for different applications. Using advanced thin-film technology and precision materials, we can produce bandwidths ranging from less than an Ångström to several hundred nanometers, allowing you to select the exact specifications needed for your application.

Filter Construction Technologies

Bandpass filters are built using two distinct construction methods, each offering unique performance advantages. Understanding these differences is key to selecting the optimal filter for your application:

All-Dielectric Type

Dielectric, or bandpass filters, are a type of optical interference filter, designed to selectively transmit specific wavelength ranges while rejecting or blocking other wavelengths. They are constructed from multiple thin layers of non-conductive materials, known as dielectrics, with varying refractive indices.

Metal-Dielectric Type

Similar to all-dielectric but utilizes a metal spacer layer. Offers excellent out-of-band blocking and high passband transmission, mainly used for bandpass filters in the ultraviolet.
By partnering with Andover Corporation, you gain access to over 45 years of expertise in designing and manufacturing environmentally stable optical filters.

Bandpass Filter Solutions

From standard to specialized designs

Every application has unique spectral requirements. Our comprehensive range of bandpass filters spans from proven industry standards to specialized designs for demanding environments and custom specifications. Select from six distinct filter types, each optimized for specific performance characteristics.

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.

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

Andover Insights & Innovations

Discovering new possibilities in optical filtering

A drone equipped with an advanced optical sensor hovers over a wildfire as a person monitors infrared imagery on a tablet. The display shows heat signatures, highlighting the role of optical technology in wildfire prevention and detection. Remote sensing optics, including thermal imaging and infrared sensors, are crucial for early fire detection, situational awareness, and risk mitigation in wildfire-prone areas.

Optical Filters for Wildfire Management

Wildfires are among nature's most destructive forces, leaving behind devastation that impacts lives, ecosystems, and infrastructure. At Andover Corporation, we...
extreme temputure

How Optical Technology Keeps Us Safe in Winter Weather

How Optical Technology Keeps Us Safe in Winter Weather How Optical Technology Keeps Us Safe in Winter Weather Winter brings...
Close-up of a modern infrared security camera with illuminated LED lights, capturing details in low-light conditions. The vibrant blue and pink lighting highlights the advanced optics used in surveillance and infrared imaging.

Reliable Alternatives to Germanium for Infrared Optics

Germanium has been a key material in infrared optics for decades, valued for its excellent transmission properties and thermal conductivity....

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.