About Bandpass Filters
The use of bandpass filters is one of the simplest and most economical ways to transmit a well-defined band of light and to reject all other unwanted radiation. Their design is essentially a thin film Fabry-Perot interferometer formed by vacuum deposition, and consists of two reflecting stacks separated by an even-order spacer layer.
Because the Fabry-Perot filter is Lorentzian in shape, the cut-on and cut-off slopes are shallow and the rate of attenuation in the out-of-band blocking range is slow. To improve the slopes and increase the attenuation in the blocking band, we introduce more cavities into the construction of our standard dielectric bandpass filters.
|80-50 (Per MIL-PRF-13830B)
Commercial instrumentation grade
(TWF 3-5 waves per inch
Parallelism 3-5 arc/minute)
|1 x 10-4 avg. from X-ray to FIR
|Max. Survival Temp Range:
|-50ºC to +50ºC
|-50ºC to +70ºC
|Mounted in an anodized aluminum ring