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Product Announcement

Knight Optical’s Dichroic Longpass Filters for use in Fluorescence Microscopy

11 Sep 2022

Knight Optical can offer Dichroic Longpass Filters for use in Fluorescence Microscopy.

We supply a range of Dichroic Longpass Filters for a range of applications – all individually QA checked and metrology tested for quality to ensure parts meet customer specification. What’s more, our Dichroic Longpass Filters are supplied in a range of sizes and shapes with custom coatings tailored to meet your individual applications.

Knight Optical supply precision optical components to customers in fluorescence microscopy. Dichroic Longpass Filters are designed to transmit wavelengths longer than the filter’s ‘cut-on’ and to block bands below that point. Our Dichroic Longpass Filters are typically made for bands between 300-1200nm, and are usually specced for a 0° AOI. Use at a 45° results in a CWL shift of around 35-50nm. In fluorescence microscopy, incident light is reflected by the dichroic filter into the objective, and the fluorescence (which has a longer wavelength than the excitation wavelength) is transmitted through the dichroic mirror into the camera.

These can also be used as beam combiners in a similar manner as a beamsplitter, and when used in conjunction with a shortpass filter, can make a bandpass filter.

Typical specs:

Material:                                             Borosilicate, Soda-Lime Glass

Dimensional tolerances:              ±0.1mm

Wavelength range:                         CWL between 300-1200nm

Wavelength accuracy:                   ± 5nm

Peak transmission:                         > 95% @ CWL

FWHM:                                                Dependant on type

Surface quality:                                < 40/20 Scratch/Dig

All our Dichroic Longpass Filters are fully inspected on their quality in our ISO 9001-certified, state-of-the-art Metrology laboratory, using our Cary 5000 spectrophotometer. This allows us to work to the highest QA standards and meet the tolerance specifications on these precision components.

Contact our technical sales team to discover how Knight Optical’s high-quality Dichroic Longpass Filters and superior service can improve your instrumentation and supply chain experience.

UK, Europe, Asia & RoW: E-Mail info@knightoptical.co.uk  Tel +44 (0)1622 859444

USA & Canada: E-Mail usasales@knightoptical.com Tel +001 401-583-7846

Knight Optical Ltd
Roebuck Business Park
ME17 1AB
United Kingdom
Tel: 44 (0)1622 859444
Fax: 44 (0)1622 859 555
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