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 Part Numbers Explained

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

The table below shows all of our LVF’s including our all new for 2021, 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

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.