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A beamsplitter is an optical window coated with a semi-transparent mirror-like film that splits one beam into two or more beams, with neutral color characteristics. Built by vacuum-depositing multi-layer dielectric films, it avoids metal-film absorption: transmission plus reflection totals nearly 100%, so the split ratio (e.g. half transmit, half reflect) is achieved with low absorption. This 850 nm single-wavelength beamsplitter is used in optical instruments, laser pointers, stage laser platforms, fiber end-face inspection, fiber amplifier inspection, digital microscopy, fingerprint recognition, electron microscopes and broadcast image processing.