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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.
In a He-Ne laser operating at 632.8 nm there is an inversion of the populations of the (2p)5 5s and (2p)5 3p levels of Ne. The inversion arises principally from inelastic collisions between Ne atoms in their ground state and He atoms in their 21So metastable level.
Helium-Neon Laser. Experiment objectives: assemble and align a 3-mW HeNe laser from readily available optical components, record photographically the transverse mode structure of the laser output beam, and determine the linear polarization of the light produced by the HeNe laser.
May 25, 2017 · In introductory chapters, the author discusses such topics as the evolution of the laser concept, laser theory and principles, methods to enhance laser operation, and accessories that improve...
May 2, 2017 · Literature research paper of the helium neon laser in a general context, including an overview, process of operation, industrial and commercial applications, and molecular spectroscopy
The most famous He-Ne laser is the typical 632.8 nm red-light laser, discovered by White and Ridged2. The highest gain in the visible spectrum can be achieved with this transition and it is therefore the most used He-Ne laser.
In this paper an overview will be given of the general working principles of the helium-neon laser. After a short introduction, the construction of the laser will be discussed as well as a the relevant energy levels
The He-Ne laser was the first continuous working laser and was invented by Javan et al. in 1961. Their work was the result of careful spectroscopic studies of inert gases which meant that the energy level diagrams and lifetimes for the different levels in these gases were well known.
A He-Ne laser consists of a hollow tube filled with 90 percent He and 10 percent Ne gases and fitted with inward-facing mirrors at the ends of the cavity. The combined pressure of the two gases is approximately 1 Torr (1/760 atmospheres).
The Helium-Neon Laser, short HeNe-Laser, is one of the most common used laser for allignement, reference laser and optics demonstrations. Its most used wavelength is at 632.8nm (red).
