Optical diffractive elements, also known as DO, or DOE, or diffractive optics are special sieves that have nanoholes similar in size to the wavelength of visible electromagnetic radiation, i.e., light. They make it possible to create projections of geometric figures of all kinds. They are applied to laser modules to create marker arrays, crosshairs, projections of various shapes for trale purposes and applications, from counting elements to position marking and more...
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