Laser

 
Fst 01 Topic Discussion on [L.A.S.E.R] by Student Help.
 
1. LASER stands for Light Amplification by Stimulated Emission of Radiation.
2.
 
3. The light that lasers produce has several useful properties that make it different from ordinary light. It is because of these properties that laser light can be put to work in a number of ways.
Difference between ordinary light and light from a laser.
Ordinary Light. 1. Light from the Sun or from a lamp, torch in our home is a mixture of many wavelengths.
2.  3. Each wavelength produces a different colour. 4. These colours mix and form ordinary light.
 
5. Colors’ in the sunlight separating out to form a rainbow in the sky after a rainy day proves it.
6.  7. . Light waves from an ordinary source of light are all jumbled up and uncoordinated in their movement.
 
8.  Whereas for Laser. 1. Laser light is made up of waves of the same wavelength. 2. all the waves in a laser beam are organised to proceed exactly in step (in phase) with each other. 3. This property of lasers is called coherence. 4. As a result of coherence, light waves in a laser beam can travel laige distames without spreading apart.
 
5. Because a laser beam does nor spread out, there is a large concentration of energy per unit area on the object on which the laser beam falls.
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