Bandpass Filters
Precision wavelength selection from 193nm to 15μm
Andover Bandpass Filters
Precision light control, from UV to IR, in one elegant solution
Bandpass Filter Selection Guide
Find the right optical filter for your application!
Beneficial for new users and industry veterans alike, this go-to resource includes:
- Descriptions of standard filter types
- Information on how to select a semi-custom filter
- Technical specifications
- Spectral profiles
- Typical applications
Emission Line Filters
Precision isolation of common spectral lines
Emission Line Filters are precision-engineered narrowband filters designed to isolate specific spectral lines emitted by gases, elements, and laser sources. These filters deliver ultra-narrow bandwidths with steep edges and high transmission, optimized for applications where selectivity and signal-to-noise ratio are critical.
Andover Corporation offers a wide range of emission line filters targeting common lines including:
- H-Alpha
- H-Beta
- HeNe
- Kr
- Ar
- Na
- Rb
- Hg
- Nd:YAG
- Ruby
- GaAs
- HeCd
- N2
Additional filters are available for specialized sources like methane, biomedical fluorescence, LED, Sapphire, and NaYAG. Each filter is manufactured in-house for precision center wavelength control, blocking, and consistent spectral performance.
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.
Frequently Asked Questions
Bandpass filters are optical filters that allow a specific range of wavelengths to pass through while blocking light outside that range. These wavelength-selective filters are essential for isolating desired signals in applications like laser systems, fluorescence imaging, and environmental monitoring.
A narrowband filter is a type of bandpass filter with a very small full width at half maximum (FWHM), typically used when you need to isolate a very precise wavelength. Both fall under the category of optical bandpass filters, but narrowband filters offer tighter spectral control.
Emission Line Filters are a specialized type of bandpass filter designed to isolate extremely narrow spectral lines emitted by gases, elements, or laser sources. They're commonly used in laser-based systems, spectroscopy, fluorescence imaging, and astronomy. At Andover Corporation, we offer these filters as a dedicated subcategory of our Bandpass Filters — engineered for precision and available for many standard emission lines, including H-alpha, HeNe, Nd:YAG, and more.
Key specifications include:
- Center Wavelength (CWL): The central point of the passband
- FWHM (Bandwidth): The width of the transmission window, expressed as "full width at half-maximum"
- Peak Transmission: Maximum efficiency within the passband
- Blocking Range: How well the filter rejects out-of-band light
These precision optical filters are engineered for high transmission in the passband and strong attenuation elsewhere.
Bandpass filters are widely used in biomedical instruments, laser systems, spectroscopy, machine vision, and astronomy. Whether you need UV-VIS bandpass filters for fluorescence microscopy or IR bandpass filters for remote sensing, these filters play a critical role in optimizing performance.
Yes — we specialize in custom bandpass filters tailored to specific wavelengths, bandwidths, and environmental conditions. Our in-house coating and fabrication capabilities allow us to deliver optimized solutions for even the most specialized optical systems.
Typical lead times range from 4 to 6 weeks, depending on complexity and order size. Contact us to discuss your project timeline and technical requirements.
From Prototype to Production
Custom Fabrication and High-Volume Manufacturing
Collaborate with Andover Corporation on custom optical products, prototype development, and specialized optical solutions supported by vertically integrated manufacturing.
With in-house fabrication, coating, assembly, and metrology capabilities, Andover can support everything from rapid prototypes to high-volume production programs with responsive lead times and consistent quality.
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- it's our foundation.
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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.