IR Interference LP Filters for use in IR Photography

21 May 2020

Knight Optical can offer infra-red interference longpass filters for use in Infrared Photography.

We supply a range of infra-red interference longpass filters for a range of applications.  All individually QA checked and metrology tested for quality to ensure parts meet customer specification.  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 Infrared Photography. Infra-red interference longpass filters are designed to transmit wavelengths longer than the “cut-on” of the filter and to block bands below that. Most infrared sensors will still recognise visible light, so a longpass filter that allows all infrared but blocks the visible is usually required.

These are also used in thermal imaging and any other applications that require visible or short wave IR to but cut. They can also be paired with a shortpass filter to make a bandpass filters.

Due to the coating being deposited using energetic sputtering it makes them very durable and resistant to harsh environmental conditions.

Typical specs:

Material:                                           (Fused Silica/Silicon/Germanium)

Diameter & aperture (mm):            12.5mm ±0.1 (8.5mm aperture)

                                                          25.0mm ±0.1 (21mm aperture)

                                                         50.0mm ±0.1 (46mm aperture)

Thickness (mm):                              ≤6.1mm +0/-0.1

CWL tolerance (nm):                        ± 20% of FWHM

FWHM tolerance (nm):                     ± 20% of FWHM

Optimum operating temp:                23°C

Edge treatment:                               Mounted in black anodized aluminium ring

Surface quality:                                80/50 Per MIL-0-13830A

Usable temperature limits:              -50°C to +80°C

All our infra-red interference 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 infra-red interference 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

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