ATOMIC LASER

Made by:- KUNWAR SINGH 1300331015 EC (IIISEM)

(a type of gas laser)

One of the type of gas laser.Rarefied gases are active media.Excited by an electric discharge.Emits matter wave.To excite atoms, sources with sharp

wavelength are required.Ex: He-Ne laser

ATOMIC LASER

He-Ne laser is an atomic laser.Employs 4-level pumping scheme.Helium-Neon laser was one of the

first laser ever developed.Active medium: 10 part of He to 1 part Ne operates in continuous wave mode.

He-Ne laser

STRUCTURE:

Fig: schematic of he-ne laser.

Consist of a glass discharge tube.Filled with a mixture of He-Ne .Electrodes are connected with high power

supply.Neon are the active centres and have the

energy level suitable for laser transition.While He atoms help efficient excitation of Ne

atoms.

Description :

Working:

• High dc voltage ionizes the gas to conduct electricity.

• e- transfer K.E. to atom by inelastic collision.

• Atoms of kind A are initially excited by e- impact.

• And they in turn transfer their energy to atoms of kind B which are the actual active centre.

Applications:

The fields in which He-Ne laser is applied are given-

Interferometry Laser printing Bar code reading As pointing and directional reference

beam

THANK YOU !

ANY QUESTION ?