Helium neon gas laser — Free Physics Illustration

Physics

Helium neon gas laser

A long, narrow cylindrical helium-neon laser discharge tube mounted horizontally in a straight optical cavity or slim frame. The transparent glass tube contains faintly glowing helium-neon gas with a soft pink-orange to orange-red glow, and has metallic electrodes or metal end caps at both ends. Circular mirrors are aligned on the axis at the two ends of the tube, with one mirror fully reflective and the other partially transparent. A thin red laser beam emerges from the partially transmitting mirror side. Clean scientific appearance, with simple end connections and clear view of the tube structure.

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