How to determine the focus position of laser cutting machine?
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If laser processes are from a few percent to maybe 20 percent, why not skip the laser part and just collimate focus the source light directly, for burning and cutting? - Quora
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Focal length, explained by RP Photonics Encyclopedia; focal distance, dioptric power, curved mirror, lens equation, microscope, photographic objective, focus, beam radius
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How to choose the correct focus position during laser cutting
