Lasers are devices that emit light through a process of optical amplification based on the stimulated emission of electromagnetic radiation. The term "laser" is an acronym for "Light Amplification by Stimulated Emission of Radiation." ### Key Characteristics of Lasers: 1. **Coherence**: Laser light is highly coherent, meaning that the light waves are in phase in both time and space. This quality allows lasers to produce focused beams of light over long distances.
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