Helium-Neon lasers are a type of gas laser that uses a mixture of helium and neon gases to produce a coherent light beam. They typically emit light at a wavelength of 632.8 nanometers, which appears as a bright red color. These lasers are known for their stability and low cost, making them popular in various applications, including barcode scanners and laser pointers. The operation of a Helium-Neon laser involves exciting the gas mixture with an electrical current, causing the atoms to emit photons. These photons are then amplified within a resonant cavity, resulting in a focused beam of light. Helium-Neon lasers are often used in scientific research and optical experiments due to their precise and consistent output.