![]() ![]() When the diffraction angle is θ=0, the order k=0, and any wavelength satisfies the great conditions there, so the center bright stripes appear at θ=0. In the equation, θ is the diffraction angle, λ is the wavelength of the light source used, k is the order of the spectrum (k=0, ☑, ☒,….), d=a+b, and is the grating constant. This is what we usually call the grating equation. The conditions for producing bright stripes at P are: The parallel light ejected from L1 shone vertically on the grating G, and the lens L2 will focus at the P of the L2 focal plane F at anθangle in the direction of the grating normal. The parallel light ejected from L1 shone vertically on part of the adjacent slits. ![]() G is a grating, which has a transmission seam with numberous width of “a”, and a width of b for the non-permeable part of the adjacent slits. If the spindle of L1 passes through the center line of the slit and parallels with each other, the sewing light source outputs parallel light after passing through L1. In Figure 1, S is a sewing light source, which is on the focal plane of lens L1. The following is a brief introduction to its basic principle and grating equation.ĭue to the spatial periodicity of the grating structure, there are a large number of equal width, equal spacing and parallel slits (or notches), so the diffraction fringes of the grating are the total effect of multi slit interference and single slit diffraction, and the diffraction pattern of the grating is the result of the intensity distribution of multi slit interference being emphasized by the single slit diffraction light. The diffraction efficiency is measured under the Littrow structure at m=1 The efficiency curve of this series of gratings is shown in Schedule 2. When cleaning, only clean and dry air can be used.įor detailed indicators of this series of gratings, please see Schedule 1. Don't touch or wipe the surface of the grating when using it. Please place it in a clean and dry environment. The surface of the grating is engraved with precision grooves, which is very vulnerable to damage. Please note not to exceed the laser threshold during use. The damage threshold of this series of gratings is typically tested at 532nm, about 150mJ/cm2 (532nm, 10ns, 10Hz). ![]() The back of the grating is polished, and the side is marked with an arrow indicating the direction of the grating, as shown in the schematic diagram below. It has two dimensions of 12.5mmx12.5mm and 25mmx25mm. At the blazed wavelength, the grating diffraction efficiency can reach 60% to 80%. For serrated grooves, the direction with the greatest light intensity is the direction of the groove surface determined by the law of reflection.ĭaheng Optics provides a blazed grating with a lithography of 300-1200 lines within a range of 360nm-1250nm. GCG series grating is one of the plane reflective gratings, which is characterized by the maximum diffraction light intensity-level glare falling outside the zero-stage spectrum, so it is called the blazed grating. According to the usage, the grating can be divided into transmission gratings and reflection gratings, and reflective gratings can be divided into plane reflection gratings, concave reflective gratings, echelle gratings, etc. It is an object or device that has a spatial periodic distribution within a certain spatial range and can amplitude modulation or (and) position phase modulation of electromagnetic waves according to certain laws. Grating is a common optical dispersion component. ![]()
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