Filters transmit light only within a defined spectral
band ranging from less than one to many nanometers wide.
and Shortpass Barrier Filters transmit only above or
below a certain "cut-on" or "cut-off" wavelength
and continue to transmit a wide energy band.
Band Filters are designed to block a narrow spectral
band, such as the monochromatic light from a laser, while transmitting
other wavelengths efficiently.
Beamsplitters are designed for optimal reflection of
one specified region of the spectrum and high transmission of another
and are used at non-normal incident angles.
Neutral Density Filters
uniformly attenuate the intensity of light over a broad spectral
Laser Line Filters
are used to isolate and transmit narrowbands related to all common
are designed to transmit energy at optimum atomic emission lines
in both arc and spark conditions.