Diffraction Grating Substrates

Application:  Diffraction gratings are used to separate wavelength spectra in a variety of instruments.  Most diffraction gratings are replicated onto substrates and then metalized to enhance reflectivity.  In some industries, the instruments are so sensitive that even minute changes in temperature can have a dramatic impact in measurement quality, which is where the substrate properties come into play.  Although glass and fused silica have relatively small coefficients of thermal expansion, it is sometimes necessary to use zero thermal expansion materials like ULE® and Zerodur®. 

Features: This diffraction grating substrate is machined from ULE® to reduce thermal expansion. The v-groove and step grind are added for mechanical mounting purposes. The tolerances on all dimensions are +/-25um.