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Light Amplification by Stimulated Emission of Radiation. A means of creating coherent light by either driving an atomic or molecular transition in an optical cavity or firing a beam of electrons through an undulator.

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Diffuse reflection of a laser beam

I'm trying to calculate how much power is detected from a laser beam after it reflects off a diffuse material. … Is it even relevant in the case of a single small laser spot that is fully in the detector's field of view? …
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