Bandpass
Overview
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 14% 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 Characteristics
| Available wavelength range | ~1.2 to 20 µm |
| Tolerance on CWL | To customers requirements, but standard tolerances are typically ±1% for a 6% bandwidth filter to ±2% for a 14% bandwidth filter. |
| Peak transmittance | Typically >70% (depending on wavelength and bandwidth) |
| Available bandwidths | Typically 6% to 14% |
| Blocking (attenuation) | Typically <0.1 % from 0.3 µm to far infrared. |
Typical Performance
