Search results
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.
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.
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.
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:
The Helium-Neon (HeNe) LASER The active laser medium is a gaseous mixture of He & Ne atoms, in a roughly 10:1 proportion. The gas is enclosed in a cylindrical quartz DISCHARGE tube sealed at each end by a mirror to form the optical cavity. Pumping is done via an electrical discharge (A GLOW DISCHARGE) created between the electrodes.
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).
A few months after Maiman announced his invention of the pulsed ruby laser, Ali Javan and his associates W. R. Bennet and D. R. Herriott announced their creation of a cw He-Ne laser. This gas laser is a four-level laser that uses helium atoms to excite neon atoms.
A Helium-Neon laser, typically called a HeNe laser, is a small gas laser with many industrial and scientific uses. These lasers are primarily used at 632.8 nm in the red portion of the visible spectrum.
