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Holographic Reflective Diffraction Gratings
The Holographic Reflective Diffraction Gratings is formed by the interference of two interfering laser beams to form fringes, and is exposed on a polished negative, and a sinusoidal pattern is formed on the exposure medium. Holographic gratings are specially designed to reduce or eliminate the effects of blazed gratings caused by periodic errors, such as ghost images (or ghost lines), relatively more stray light, and so on. The holographic grating is not easy to produce blaze, and the efficiency is lower compared with the ruled grating. But when the ratio of scribed width to wavelength is close to 1, the efficiency of holographic gratings is virtually the same as that of scribed gratings. Furthermore, a holographic grating with 1800 lines per millimeter is as efficient as a ruled grating at 500 nm. Can be used in spectrometers, spectrophotometers, and monochromators. This product is aluminized and has great reflectivity in the ultraviolet, visible and infrared spectral ranges.
Ruled Reflective Diffraction Gratings
Diffraction grating is a kind of optical glass substrate composed of dense, equidistant parallel lines, and the surface is coated with aluminized reflective film, which can separate white light into various components through diffraction effect. High-quality ruled diffraction gratings can meet almost all diffraction needs, especially when the efficiency requirements are relatively high. Diffraction gratings can be used in a variety of monochromatic research, teaching, and industrial applications. Almost all commercial spectrophotometers use diffraction gratings to select specific wavelengths or scan the entire wavelength region. Customers can select gratings according to size, groove spacing and blaze wavelength. Because the surface of the grating is aluminum film, there is no inventory in advance, but the grating can be quickly copied according to customer requirements.