A helium-neon laser uses an electrical discharge in a helium–neon gas mixture to establish optical gain on neon transitions. Excited helium atoms transfer energy in collisions to suitable excited neon states, helping create the required population inversion.
A discharge tube and aligned resonator mirrors form the apparatus; one mirror transmits part of the circulating light as output. The familiar red emission is one selected transition rather than a direct photograph of the entire discharge spectrum. Gas pressure, discharge current and mirror selection affect oscillation, while misalignment can suppress the laser output even when the discharge remains visibly bright.
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.
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