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Jun 14, 2020 · He-Ne laser is a gas laser that emits red light having wavelength of 632.8 nm. It is widely used in scientific research, industrial applications, medical procedures, and communication because of its coherence, stability, and affordability.
A helium–neon laser or He-Ne laser is a type of gas laser whose high energetic medium gain medium consists of a mixture of ratio (between 5:1 and 20:1) of helium and neon at a total pressure of approximately 1 Torr (133 Pa) inside a small electrical discharge.
In He-Ne laser, neon atoms are the active centers and have energy levels suitable for laser transitions while helium atoms help in exciting neon atoms. Electrodes (anode and cathode) are provided in the glass tube to send the electric current through the gas mixture.
The Helium-Neon (He-Ne) laser is a type of gas laser that has been widely used for various applications due to its coherent and monochromatic output. This article explores the construction, working principle, applications, and energy level diagram of the He-Ne laser in detail.
Helium–neon (He–Ne) lasers are a frequently used type of continuously operating gas lasers, which is also the first demonstrated gas laser (already in 1961 ). Most often, He–Ne lasers emit red light at 632.8 nm at a power level of a few milliwatts and with excellent beam quality.
This gas laser is a four-level laser that uses helium atoms to excite neon atoms. The atomic transitions in the neon produce the laser light. The most commonly used neon transition in these lasers produces red light at 632.8 nm.
Perhaps the most well-known gas laser is the helium-neon (He-Ne) laser. Its most most well-known line corresponds to the 3 s 2 –2 p 4 transition at λ = 632.82 nm. This transition is made possible by excitation transfer from atoms at the helium metastable level He*(2 3 S 1 ) to ground state Ne atoms (Willett, 1974).
