Interference filters pass a very narrow spectral band of visible or near-infrared light and reject all out of band wavelengths from low UV to far IR. The rejected light is either reflected back or absorbed by the filter. The typical interference filter has a bandpass of 10nm or 20nm wide, in which its FWHM transmission efficiency is typically only 40-50%. Interference filters are classified by their bandpass center wavelength. Sciencetech offers a wide selection ranging from 254 to 1064 nm.
 
Typical Transmission Efficiency
The Miniumum Peak Transmission (MPT) ranges from 17% for the sub 308nm center wavelenths to 25-50% for the 334 to 694 nm center wavelengths to 50% for the >730 nm center wavelength filters.
 
Heat Tolerance
Interference filters reflect much of the unwanted light and hence gives it a high heat tolerance. Whether in the visible or IR spectral region, they can typically tolerate up to 0.75W/cm² of light power on them. This is the total light power shining on the filter and not the portion that is being absorbed by the filter. This is based on an uncooled filter.
 
Technical Specifications
Center wavelength (CWL) Tolerance: ± 2nm
Full Width half maximum FWHM: 10 nm
FWHM Tolerance: ± 2nm
Operating Temp. Range: -50 °C to 75 °C
Surface Quality: 80-50
Angle Sensitivity: Intended for collimated input
Blocking: ≤0.1%, X-ray to 1.2µm