heliumneonlaserit

Heliumneonlaserit, commonly known as HeNe-laserit, are gas lasers that produce a light beam at a specific wavelength, typically 632.8 nanometers, which appears red. They were among the first gas lasers to be developed and remain widely used in various applications due to their reliability and stability. The laser medium consists of a mixture of helium and neon gases within a sealed tube. An electrical discharge excites the helium atoms, which then transfer their energy to neon atoms through a process called collisional excitation. These excited neon atoms then emit photons, initiating the laser action. The laser cavity is formed by mirrors at either end of the tube, one of which is partially reflective, allowing the laser beam to exit. HeNe-lasers are known for their excellent beam quality, meaning the light is highly collimated and has a very low divergence. This makes them suitable for applications requiring precise alignment, interferometry, and barcode scanning. Despite the advent of other laser technologies, the simplicity and robustness of HeNe-lasers have ensured their continued relevance in scientific research, metrology, and industrial alignment tasks.