[Physics Article] Lasers and types of lasers Full Explained | By Science Tutor

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Meaning of Lasers

The term LASER stands for the

Light Amplification by Stimulated Emission of Radiations.

History of Lasers

1. THE LASER WAS INTRODUCED TO THE SCIENTIFIC WORLD IN 1960s.

2. THE FIRST LASER WAS DEVELOPED BY T.H. MAIMAN IN YEAR 1960.

3.  THE PRACTICAL USE OF LASERS IS PREDICTED BY C. H. TOWNES.

Types of Lasers

1. SOLID STATES LASERS.
2. SEMICONDUCTOR LASERS.
3. GAS LASERS.
4. ELECTRO IONIZATION LASERS.
5. GAS DYNAMIC LASERS.
6. CHEMICAL LASERS.

   I.      Solid States Lasers.

In this types of lasers active centers (Cr, Co, Nd etc) are dispersed in a dielectric crystals or glass  material. Conc. Is just about 1%.

The various solid states lasers:

          1.             Ruby Lasers.

          2.            Nd:YAG lasers

          3.            Colour center lasers.

Solid States Lasers (Ruby Laser)

II.  Gas Lasers

The Active medium used in lasers is gaseous.

The various gas lasers are:

1.           He-Ne Lasers.

2.          CO₂ lasers.

Gas Lasers (Co2 Laser)

III.      Semiconductor Lasers

A semiconductor lasers is a specially designed pn-junction diode device that emits coherent  light under the forward biased condition. the first semiconductor laser was designed by R. N. hat et. Al in 1962 in U.S.A.

Semiconductor Lasers

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