Operating Wavelength Of He Ne Laser

A helium neon laser or he ne laser is a type of gas laser whose gain medium consists of a mixture of 90 helium and 10 neon at a total pressure of about 1 torr inside of a small electrical discharge the best known and most widely used he ne laser operates at a wavelength of 632 8 nm in the red part of the visible spectrum. From the wavelength of the he ne laser line λ 6 328 x 10 7 m calculate its frequency. Consequently an uncertainty of this magnitude can be assigned for the wavelength of the laser even if it has not been calibrated and even if the laser is not frequency stabilized.

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Thus we get a band of frequencies eligible to participate in stimulated emission and thus to be amplified.

Operating wavelength of he ne laser.

The laser light produced then also has a band. Thorlabs stabilized helium neon laser with a center wavelength of 632 991 nm allows for either frequency or intensity stabilization necessary for many spectroscopy interferometry and wavemeter applications. In frequency stabilized mode the laser will keep its lasing frequency i e wave. The 632 8 nm optical light is emitted by the laser when the neon atoms decay from an excited.

Abstract the vacuum wavelength of a gas laser cannot vary from its central value by more than a few parts in 10 6. Advantages of he ne laser. The helium neon laser consists of three essential components. In he ne laser pumping occurs through collision of electrons and atoms during an electrical discharge.

He ne laser tube has very small length approximately from 10 to 100cm and best life time of 20 000 hours. Pump source high voltage power supply. He ne laser has very good coherence property. The helium neon laser operates at a wavelength of 632 8 nanometers nm in the red portion of the visible spectrum.

In addition to the applications listed to the right hene lasers are widely used in education and as alignment tools due to their excellent beam quality and gas discharge laser characteristics. He ne laser can produce three wavelengths that are 1 152µm 3 391 µm and 632 8nm in which the 632 8nm is most common because it is visible usually in red color. Thorlabs offers an extensive selection of ce compliant 632 8 nm red helium neon hene lasers with powers from 0 8 mw to 22 5 mw from stock.

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