Optical Filters
Wavelength Is Only the Beginning
Optical filters control which parts of the spectrum reach your detector or optical system. But selecting the right filter involves more than defining wavelength, transmission and blocking requirements—beam geometry and angle of incidence can significantly influence spectral performance.
Our broad portfolio covers high-performance filters for machine vision, fluorescence, spectroscopy, Raman, laser systems and other analytical applications.
Find the Right Filter
Explore the key filter technologies below or talk to our experts to find the right solution for your optical setup.
Bandpass Filters
Transmit a defined wavelength range while blocking others.
Longpass & Shortpass Filters
Transmit wavelengths above or below a defined cutoff.
Notch Filters
Block a narrow wavelength band while transmitting the rest of the spectrum.
Neutral Density Filters
Reduce light intensity uniformly across the spectrum.
Dichroic Beamsplitters
Reflect or transmit light based on wavelength.
Custom Optical Filters
Customer-specific spectral and geometric requirements.
Why Beam Geometry Matters
The spectral specification is only part of selecting the right filter.
How light reaches the filter can significantly affect its performance.
Industrial & Machine Vision
Diverging / converging light
In imaging systems, light can reach the filter over a wide range of incidence angles. Standard interference filters may shift spectrally as the angle increases, potentially reducing contrast or collapsing completely at the edges of the field of view.
Our industrial imaging filters are optimised for a very large cone angle at which the light may incide which helps provide:
Stable spectral performance · Improved image uniformity · Higher contrast · Better classification reliability
Scientific & Analytical Systems
Collimated or near-collimated light
Scientific instruments often require exceptional spectral precision, high transmission and deep blocking to detect weak optical signals against background light.
Filters optimised for these systems provide:
Precise wavelength control · High transmission · Deep blocking · Improved signal-to-noise ratio · High measurement repeatability
Application First
The right filter isn’t defined by wavelength alone.
By considering spectral and environmental requirements, beam geometry, incidence angle, laser parameters and the complete setup, our experts help select a filter optimised for your actual application—not just the nominal specification.
Explore Related Product Categories
Transmissive Optical Elements
Control, shape, focus or direct light with precision optical components.
Reflective Optical Elements
Direct, focus and collimate light across broad wavelength ranges with mirrors.
Optomechanics & Motion
Position, align and move optical components with stable, precise mechanical mounts and motion solutions.
Knowledge Centre
Guides, insights and resources across photonics applications and technologies.
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Frequently Asked Questions
Why does beam geometry affect filter performance?
Interference filters can shift spectrally as the angle of incidence increases. Filters optimised for diverging or collimated light behave differently, which is why the application context matters as much as the wavelength specification.
Can filters be customised for specific applications?
Yes. We support customer-specific spectral, geometric and coating requirements across industrial, scientific and analytical applications.
Need Advice?
Our optics specialists are happy to help you select the right optical filter—or develop a customer-specific solution for your application.