ISO 9001 - AS 9100 - ITAR Standard & Custom Optical Filters and Coatings



Andover Corporation was established in 1976 with the purpose of designing and manufacturing high-quality optical filters and coatings. Over the years as the company has grown, the focus has remained on quality. Our current facility spans 44,000 square feet on 17 acres of land in Salem, NH.

Our facility is custom-designed and state-of-the-art, and includes automated coating, glass polishing, and fabrication equipment. Our testing capabilities are extensive, including both automated spectrophotometers for broadband spectral measurements, and ultra-high-resolution spectrophotometers for narrowband measurements. Our optical metrology lab features a custom-designed, computer-controlled tunable interferometer to measure transmitted wavefronts beyond the capabilities of a traditional laser interferometer.

We manufacture filters and coatings for a wide variety of applications, including medical instrumentation, fluorescence studies, machine vision, agricultural imaging, ground-based and space-borne astronomical observation, telecommunications, military and civilian surveillance systems, and defense targeting systems.

Quality and Service That Make a Difference

Unlike most optical filter and coating manufacturers, we supply spectral curves and digital data with most orders at no additional charge, saving you the cost of incoming quality control. We’ll even help you reduce inventory by shipping your order only when you require it.

Andover Corporation Houses a Wide Array of Coating Technologies

Including magnetron sputtering, ion-assisted electron beam deposition and resistance evaporation, producing the best possible solutions to suit your needs. State- of-the-art, custom-designed and computer-controlled coating chambers ensure accuracy and repeatability.

Total Quality Control and Optical Testing

Starts with the raw material and continues through the finished product. To ensure total quality control, our equipment is custom designed and constructed to our exact specifications.

Custom Advantages

While stocking over 1,500 standard filters, Andover Corporation has built a worldwide reputation for developing custom, state-of-the-art, filters and coatings.

With our extensive engineering experience and advanced manufacturing facility, we control the entire production process to ensure that you receive only the highest-quality products, attentive service, and timely delivery.

  • Fully-automated systems for excellent repeatability and rapid turnaround

  • Continuously updated manufacturing processes

  • Products that far exceed industry standards for quality

Image Quality Filters

Have demanding custom imaging requirements?

Image quality filters are ideal for applications that require high resolution, such as astronomical observations, video monitoring systems, high-resolution photography, and other imaging applications. To meet these demanding requirements, Andover Corporation has developed a line of custom Image Quality (IQ) filters using high-grade optical material that is both striation and inclusion-free. The surfaces are ground and polished to a transmitted wavefront of λ/4 per inch and parallel to 30 arc seconds or better. The internal coating positions are optimized and the exterior surfaces anti-reflection coated to eliminate multiple images and fringe patterns, maximizing energy throughput. For very high-resolution applications, we can also provide image quality filters with a transmitted wavefront of λ/10 and parallelism of 10 arc seconds.