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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.
He-Ne Laser. He-Ne stands for Helium-Neon. The He-Ne laser active medium consists of two gases which do not interact form a molecule. Therefore He-Ne laser is one type of atomic gas lasers. Construction of He-Ne Lasers. The construction of typical He-Ne laser plasma tube can be shown as:
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.
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).
