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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
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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) |
| Available bandwidths |
Typically 6% to 13% |
| Blocking (attenuation) |
Typically <0.1 % from 0.3 micron to far infrared. |
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Bandpass filters
