Helium neon laser construction and working youtube. Given f2 and ap a convenient working distance from the tube, one can determine a0p. What links here related changes upload file special pages permanent link page. In this video i explain you about the helium neon laser and that too in hindi. The heliumneon laser was the first continuous laser. The wavelength color of laser light is extremely pure monochromatic when com pared to other sources of light, and all of the photons energy that make up the laser beam have a fixed phase relationship coherence with respect to one another. The light energy sources such as flashtubes or laser diodes are used to supply energy to the active medium. Heliumneon laser usually called a hene laser is a type of gas laser in which a mixture of helium and neon gas is used as gain medium. Yag laser is a fourlevel laser system, which means that the four energy levels are involved in laser action.
Therefore hene laser is one type of atomic gas lasers. Discuss in detail the construction, theory and working of hene laser. N 1 to achieve the condition of population inversion between e 2 and e 1 at moderate pumping. Fundamentals, types, and operations n n e 0 e e 1 e 3 e 0 e e 1 2 fast decay fast decay fast decay pumping pumping lasing lasing a b figure 1.
The gain medium is a mixture of the two gases helium and neon. Heliumneon laser is a type of gas laser in which a mixture of. Hene laser construction and working heliumneon laser definition. The heliumneon laser, short henelaser, is one of the most common used laser. Hene laser construction and working self study world. In hene laser, neon atoms are the active centers and have energy levels suitable for laser transitions while helium atoms help in exciting neon atoms. I will mail you the pdf of the notes on your email id. It also has lasing transition in ir, orange and green. A heliumneon laser or hene laser, is a type of gas laser whose gain medium consists of a.
A heliumneon laser is a gas laser, consisting of a mixture of helium and neon gas in a ratio between 5. The construction of typical hene laser plasma tube can be shown as. The hene laser active medium consists of two gases which do not interact form a molecule. Previous year question papers physics lasers, optical. Hene laser consists of a narrow discharge tube of bore glass or quartz of length 10 to 100 cm with a diameter of the order of 5mm to 10mm the tube is filled with a mixture of helium and neon gases, approximately in the ratio 85 % a helium and 15% neon, contained at low pressure typically 23 torr. Electrodes anode and cathode are provided in the glass tube to send the electric current through the gas mixture.
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