What is the difference between single-mode and multimode lasers?

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Single-mode lasers emit light through a single spatial mode, resulting in a narrow beam with high coherence and low divergence, making them ideal for long-distance communication. In contrast, multimode lasers can operate through multiple spatial modes, producing a broader beam that is less coherent and more divergent, suitable for applications like short-range data transmission. The term "mode" refers to the specific patterns of light waves that can propagate through the laser medium. Understanding these differences is crucial for selecting the appropriate laser type for specific applications. The choice between single-mode and multimode lasers significantly impacts performance in various optical systems.
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What is a single-mode laser? what is a multimode laser?
 
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