Light beam passing through a diffractive grating is partially deflected into several diffractive orders, which get subsequently blocked by diaphragm. Thus the zero order beam (does not change the direction of propagation) is attenuated. The intensity of output radiation Ioutput depends on the grating design and wavelength of input beam. By changing the grating parameters one can control the power of output radiation. The transmission coefficient of such an attenuator is η= Ioutput/Iinput.
Beam-modulators for high power lasers (Nd:YAG-, Argon-, Excimer-...) for material processing (e.g. marking), scanner systems, etc.
Beam-splitters with adjustable splitting coefficient and attenator.
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