Laser
Category : JEE Main & Advanced
Laser is a process by which we get a beam which is coherent, highly monochromatic and almost perfectly parallel. Such a beam is also called laser.
| Coherent : | Because all the photons in the light beam, emitted by different atoms, at different instant are in phase. |
| Monochromatic : | Because, the spread \[\Delta \lambda \] in wavelength is very small, of the order of \[{{10}^{-6}}nm\]. |
| Perfectly parallel : | Because, a laser beam can be sent to a far off place and returns back without any practical loss of intensity. |
The term LASER stands for Light Amplification by Stimulated Emission Radiation.
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