A helium-neon laser is a type of gas laser that uses a mixture of helium and neon gases to produce a coherent beam of light. It typically emits light at a wavelength of 632.8 nanometers, which appears as a bright red color. This laser is known for its stability and low cost, making it popular for 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. The helium-neon laser is also utilized in scientific research and educational demonstrations, showcasing the principles of laser technology.