Frequency-Stabilized Helium-Neon Laser
A helium-neon laser is a gas laser that uses the neutral atomic gases helium and neon as the working medium. It consists of three parts: a discharge tube, a resonant cavity, and a laser power supply, and outputs continuous laser light by continuous excitation. The coherence length of a frequency-stabilized helium-neon laser can reach about 100 meters. Frequency stability further improves the coherence length for critical measurement or exposure.
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