State the characteristics of laser beam and explain any one of them in brief
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1. Directionality: An ordinary source of light emits light waves in all the directions and is highly divergent. But the divergence or angular spread of a laser is very small.
2. Monochromaticity: It means that all the laser rays have same wavelength and frequency when they are emitted from the same source.
3. Brightness: A laser beam has brightness many times in magnitude greater than that of conventional sources due to high directional property of laser beam.
4. Coherence:Two or more light waves are said to be coherent if they bear a constant phase relation among themselves. Coherence can be classified into two ways:
a) temporal coherence
b) spatial coherence.
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