Bandpass Filters

Bandpass filters isolate a band of wavelengths from the total spectrum by providing a band of high transmission and bands of high rejection of spectral energy on both the long and short wavelength sides of the transmission band. These filters are defined by cut-on and cut-off slopes establishing the transition between high rejection and high transmission. Cut-on and cut-off edges defining the bandpass region can either be defined by Fabry-Perot construction, as is common for narrow bandpass filters, or by the combination of long wave and short wave pass filter coatings. Bandpass filters can be manufactured with a wide variety of performance attributes ranging from the simplest single-cavity, unblocked Fabry-Perot construction, to the more complex multi-cavity, fully-blocked, all-dielectric, single-substrate construction.

We make them all - from the simplest to the most complex, over the range of 200 nm to 8 µm with bandwidths as narrow as 0.1nm in the UV/VIS to as wide as 2µm in the mid-wave IR.

Bandpass filters are widely deployed in many diverse applications including paint-color formulation, blood chemistry analysis, and traffic control.

To discuss your specific requirements, please call 508-528-4411 to speak directly to one of our Technical Sales Engineers, or email us at

While the vast majority of the bandpass filters that we manufacture are custom designed for OEM instrumentation, we also manufacture a selection of catalog products that are available for immediate delivery from inventory including fluorescence excitation and emission filters, laser line filters, mercury line filters and basic-research bandpass filters.

Argon-Gap™ UV
Custom Specified
HPF Bandpass
UV Extreme