Bandpass
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 catalogueNeed a bespoke product?
We have a wide range of filters available for purchase through our online catalogue. If you can’t find the product you need, please click here to contact us and discuss bespoke orders.
Click here to get in touch