Diffractive gratings produced by Optometrics are available from LASER COMPONENTS in ruled and holographic form. A grating consists of a series of equally spaced parallel groves formed in a reflective coating and placed on a substrate. The distance between groves and the angle influence both the dispersion and efficiency of a grating. The ruled gratings are physical grooves cut into a reflective surface, whilst gratings produced from laser constructed interference patterns and a photolithographic process are known as holographic gratings.
Whilst ruled gratings give better efficiency with sharper peaks at its blaze wavelength, the holographic grating has a more even and flatter spectral response. As Optometrics’ holographic gratings give very low stray light, due to near perfect spacing between grooves almost zero random spacing errors, they are ideal for critical signal to noise applications.
