Experience the powerful, interactive Spectra Viewer from Chroma Technology. This simple-to-use tool provides insight into the world of optical filters, filter sets, and fluorochromes, designed to support and enhance your work.

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In the consumer electronics market, optical filters offer enhanced imaging capabilities for displays, cameras, and smartphones.

If you don’t see what you are looking for, please contact us. We have a large inventory of filters and a knowledgeable staff ready to help you design and build a filter to meet your specifications.

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Expert guidance and comprehensive support from initial consultation to final implementation, including customized solutions.

Raman filters are ideal when you need higher transmission values, fast transitions, and superior blocking to keep out unwanted photons.

High-performance optical filters specifically designed, our precision-engineered filters enable astronomers to achieve clearer views of celestial objects.

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We manufacture high-quality, narrow-band spectral line filters for detecting ionized sulfur, oxygen, and other elements.

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Expertise in optical filter technology, a deep understanding of applications in life sciences and clinical instrumentation.

Our reputation is built on dedicated customer service, including technical and application support. We manufacture high-performance optical filters covering a spectral range from 200-3000nm with superior durability and longevity, across many industries and applications. Our filter types include long, short, and multi-bandpass filters, notch rejection filters, neutral density filters, beamsplitters and reflective metal mirrors.

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Now that we have briefly explained what numerical aperture is, we can equate it to f/#. As explained here, f/# is also a measure of how much light can get through a lens. f/# of a simple lens is defined by the following equation, where f is the focal length of the lens and D is the diameter (or more specifically the entrance pupil diameter for more complex lens systems).

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In aerospace applications, the need for precise signal detection is paramount. These environments are harsher than others: extreme temperatures, friction, and vibration can threaten the integrity of mission-critical applications.

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Thorlabs' optical prisms are useful for a wide range of applications. Our extensive collection of optical prisms includes various shapes and configurations, ...

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Now we can find the focal length of the lens by assuming that the customer wants entrance pupil diameter to stay at the specified 20mm.

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In order to equate NA and f/#, we can use simple geometric relationships. Figure 3.1 shows a simple lens focusing light rays (blue lines) from infinity to a point. This creates a cone of light that can be described by numerical aperture using the previous equation. The half angle, α, can now be defined by the following equation:

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This is an exact equation relating the NA to the f/#, but it is often convenient to have an approximation for this. When n = 1 (medium is air) and if we use a small angle approximation (sin α ≈ tan α) then:

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To determine whether lens specifications are compatible, we need to find the resulting numerical aperture from the other three specifications. To do this we will first need to use the equation below to relate the image height h, focal length f and the half field of view Θ. This equation can be derived using simple geometry using the relationships shown in the red triangle in figure 3.2.

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Often times when starting the design process one can inadvertently request conflicting specifications. This example will show how easy this is to do and how to avoid it when specifying a lens.

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If the medium is not air, as is common for some microscope objectives, the approximation above can be multiplied by the index of refraction of the medium as shown below.

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Satellite imaging, remote sensing, or aircraft instrumentation, our optical filters ensure precision and clarity, vital for navigation, reconnaissance, and scientific exploration.

Filters play a crucial role in enhancing clarity, color accuracy, and contrast in machine vision applications where details matter.

Many modern biomedical technologies—from PCR to flow cytometry, DNA sequencing to clinical chemistry analysis—rely on the clarity of fluorescence signal detection.

Numerical aperture (NA) refers to the cone of light that is made from a focusing lens and describes the light gathering capability of the lens (similar to f/# ). NA is defined by the following equation, where n is the index of refraction of the medium (often n=1 for air), and α is the half angle of the cone of light exiting the lens pupil.

Experienced in serving the scientific, biomedical, and photonics communities we know how to design and deliver optical filters.

Manufacturing high-performance optical filters covering a spectral range from 200-3000nm with superior durability and longevity. Offering off-the-shelf, custom, and high-volume production products and solutions, we can design and deliver optical filters that do precisely what our customers need.

An extensive range of solutions, from the ultraviolet to the infrared, for major microscope brands and custom-built systems.

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Our filters optimize industrial processes like machine vision and quality control, fostering efficiency and innovation across diverse sectors.

Astrophotography uses spectral imaging to measure diverse properties of astronomical objects including molecular composition, ionization state, redshift, and temperature.

So what if the customer needs a numerical aperture of 0.25? To get this, at least one of the other specifications need to change. To do this, lets start with the initial specification for NA=0.25 and find what the f/# would be using this spec.

Below are three sets of lens specifications that would result in the desired system NA. There is an infinite number of specifications that will give the desired NA if one is allowed to change more than one spec.

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