brief introduction： A laser is a device that emits light through a process of optical amplification based on the stimulated emission of electromagnetic radiation.A laser differs from other sources of light in that it emits light coherently. Spatial coherence allows a laser to be focused to a tight spot, enabling applications such as laser cutting and lithography. Spatial coherence also allows a laser beam to stay narrow over great distances (collimation), enabling applications such as laser pointers. Lasers can als

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