Northumbria Optical Coatings Ltd


Bandpass filters are designed to isolate a relatively wide spectral band. They are classified by having bandwidths (measured at half-peak transmittance levels) between 6% and 13% of the centre wavelength value. When ordering, the bandwidth can be expressed as a percentage of the centre wavelength or can be given in microns. The filters exhibit high peak transmission in the passband (typically greater than 70%) and very low transmission levels outside the passband (typically less than 0.1%).

Typical Performance


Typical Characteristics

Available wavelength range ~2 to 20 mm
Tolerance on CWL To customers requirements, but standard tolerances are typically +/-1% for a 6% bandwidth filter to +/-2% for a 13% bandwidth filter
Peak transmittance Typically >70% (depending on wavelength and bandwidth)
Available bandwidths Typically 6% to 13%
Blocking (attenuation) Typically <0.1 % from 0.3 micron to far infrared.

Buy filters online

View our online catalogue

Need a bespoke product?

We have a wide range of filters available for purchase through our online catalogue. If you canít find the product you need, please click here to contact us and discuss bespoke orders.

Click here to get in touch