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DOE optics vs. classic lens optics – pros and cons?

Classic lens optics (cross-line laser): very sharp, narrow lines; brightest at the centre, fading towards the line ends (Gaussian profile). Ideal for precise centring where line sharpness is critical. DOE optics (positioning laser): even brightness across the entire pattern, defined outer boundary, arbitrary patterns possible. Lines are inherently a little wider and less sharp than with lens optics. When to choose which? Classic optics for micrometre-level centring and microscope work. DOE optics for operator guidance, pick-by-light and anywhere the whole pattern must be evenly visible.