Helium-neon lasers are a type of gas laser that uses a mixture of helium and neon gases to produce a coherent beam of light. 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. These lasers are commonly used in laser pointers, barcode scanners, and optical devices due to their ability to produce a continuous wave of light. Their simple design and reliable performance make them suitable for both commercial and educational purposes.