It was the first gas laser invented by javan et al in 1962 at bell telephone laboratories. When electric discharge is passed through the gas mixture of he and ne, electrons are accelerated down the discharge tube in which mixture of hene is placed. This electric discharge excites helium from the ground state, to the longlived, metastable excited states. By chance, helium and neon have nearly identical metastable states, located at 20. Heliumneon hene lasers properties and applications. Today let us discuss the working of helium neon laser. Commercial lasers data sheets lumentum operations llc. The aim of this work was to evaluate the efficacy of helium neon hene laser therapy on post mastectomy lymphedema and shoulder mobility. It also has lasing transition in ir, orange and green. A broad selection of commercial laser products including kw class, ultrafast, qswitched, and lowpower continuous wave lasers commercial lasers data sheets lumentum operations llc skip to. A helium neon laser or hene laser is a gas laser consisting of a mixture of neon and helium within a small bore capillary tube, which is excited by a dc electrical discharge. The heliumneon laser, short henelaser, is one of the most common used laser for allignement, reference laser and optics demonstrations.
It is the most common type of a laser used in physics laboratories. Its discharge tube is fitted with 80% helium and 20% neon gas. Helium neon laser is a type of gas laser in which a mixture of helium and neon gas is used as a gain medium. Hene laser construction and working helium neon laser definition. When energy from the pumping source is applied hene gas mixture then some of the energy is observed by the helium atoms. These accelerated electrons collide with helium atoms and excite them. In heliumneon lasers, we use high voltage dc as the pump source. The neon is the lasing or active medium in this tube.