Ruled and holographic gratings differ in their optical characteristics and each type has advantages for specific applications.
#TRANSMISSION DIFFRACTION GRATING FORMULA FULL#
We are one of the few companies that produce both types of gratings in-house and has full replication facilities and expertise. Gratings produced from laser constructed interference patterns and a photolithographic process are known as interference or holographic gratings. Physically forming grooves into a reflective surface with a diamond mounted on a “ruling engine” produces ruled gratings. The way in which the grooves are formed separates gratings into two basic types, holographic and ruled. If the wavelength is much smaller than the groove spacing, the facets of the groove will act as mirrors and, again, no diffraction will take place. If the wavelength of the incident radiation is much larger than the groove spacing, diffraction will not occur. The distance between adjacent grooves and the angle the grooves form with respect to the substrate influence both the dispersion and efficiency of a grating. A grating consists of a series of equally spaced parallel grooves formed in a reflective coating deposited on a suitable substrate.
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