Infrared Linear
Variable Filters

Our stock LVF s cover 3 ranges 0.9-1.7 µm, 1.3-2.5µm and 2.5-5.0µm , these can be purchased from our web-shop.

We also manufacture custom LVF’s, contact us to discuss further.

Applications include mini-spectrometers, multi-gas analysis, industrial process monitoring and many more.

Infrared Linear Variable Filters are narrow band filters where the Centre Wavelength (CWL) changes with distance along it’s length, this is shown in the diagram below for a 2.5-5.0 µm type.
Our range of stock LVF s allow the user an opportunity to explore the technology but at a relatively low cost.

Follow the link below to see our range of LVF’s including our all new ‘Generation 2’ LVF s launching in 2021.

LVF Performance Explained

The diagram below shows the performance ‘end to end’ of a 2.5µm-5.0µm LVF

Note that change is continuous from one end to the other

LVF Datatable


The table below shows all of our LVF’s including our all new, 2nd Generation LVF’s. More information can be found through the datasheet links.

Product NumberRangeDimensions (Length x Width x Thickness)Bandwidth (as a % of centre wavelength)DatasheetPriceBuy Now
LVF 0.9-1.7-3.5-15-0.5-2%0.9 - 1.7 µm15 x 3.5 x 0.5 mm2% (Generation 1)See Datasheet£500.00Buy Now
LVF 1.3-2.6-3.5-15-0.5-2%1.3-2.6 µm15 x 3.5 x 0.5 mm2% (Generation 1)See Datasheet£550.00Buy Now
LVF 2.5-5.0-3.5-15-0.5-2%2.5-5.0 µm15 x 3.5 x 0.5 mm2% (Generation 1)See Datasheet£600.00Buy Now
LVF 0.9-1.7-3.5-15-0.5-1%0.9 - 1.7 µm15 x 3.5 x 0.5 mm1% (Generation 2)See Datasheet£700.00Buy Now
LVF 1.3-2.6-3.5-15-0.5-1%1.3-2.6 µm15 x 3.5 x 0.5 mm1% (Generation 2)See Datasheet£750.00Buy Now

LVF Part Numbers Explained

Example: LVF 2.5 – 5.0 – 15.0 – 3.5 – 0.5

Features of Generation 2 Infrared Linear Variable Filters

  • 2 ranges covered, 0.9-1.7µm and 1.3-2.5 µm.
  • Width/FWHM =1% x Centre Wavelength.
  • Blocking greater than OD 3.5 average outside passband.
  • Specifically for systems where higher signal to noise ratio is critical.

Features of 1st Generation Infrared Linear Variable Filters

  • 3 ranges covered, 0.9-1.7µm, 1.3-2.5 µm and 2.5-5.0 µm.
  • Width/FWHM =2% x Centre Wavelength.
  • Blocking greater than OD 2.5 average outside passband.

Custom LVF’s

We manufacture and design custom infrared LVFs. This is likely to involve working with you to design, specify and manufacture a unique solution for your application. We are able to make different bandwidths, sizes etc to suit your needs. For more information please contact us on the link below.