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A Helium-Neon (He-Ne) laser is a type of gas laser that utilizes a mixture of helium and neon gases to produce coherent light. It was one of the earliest types of lasers developed and is widely used in various applications due to its relatively simple design and stability. ### Key Characteristics: 1. **Working Principle**: The laser operates on the principle of stimulated emission. In a helium-neon laser, an electrical discharge excites helium atoms in the gas mixture.