In an He-Ne laser, from where does the lasing transitions.
The argon ion laser can be operated as a continuous gas laser at about 25 different wavelengths in the visible between 408.9 and 686.1nm, but is best known for its most efficient transitions in the green at 488 nm and 514.5 nm.
Subsequent transitions from the excited and metastable states of Neon are shown on the energy diagram. The resulting trial spectrum appears directly below the energy diagram, and above the actual spectrum for the He-Ne laser. STEP 3: Matching trial spectral lines to those of the actual spectrum.
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This gas laser is a four-level laser that use helium atoms to excite neon atoms. It is the atomic transitions in the neon that produces the laser light. The most commonly used neon transition in these lasers produces red light at 632.8 nm.
A He-Ne lasers is a type of Gas-laser ,whose gain medium is consists of helium and neon (10:1) inside of a small bore capillary tube excited by the DC electrical discharge. It produces intense beam of light which are coherent, monochromatic and highly collimated and it’s wavelength is extremely pure, comparing to other source of light.
The helium-neon laser was the first continuous wave (CW) laser ever constructed. It was built in 1961 by Ali Javan, Bennett, and Herriott at Bell Telephone Laboratories. Helium-neon lasers are the most widely used gas lasers.
The basic principles of laser operation are described by Svelto (1982), and the relevant pages are reproduced in Appendix IV. 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.