User talk:Sreenatha N R/sandbox

Laser
LASER the acronym stands for Light Amplified by Stimulated Emissions of radiations Definition: It is a device that produces a high-intensity, monochrome, directional, coherent, and sharply focusing beam. It differs from the other sources of light such as mercury vapor lamp, sodium vapor lamp, sunlight, light-emitting diode, etc.

Unique Properties of a laser:
 * 1) High-intense: The photon density is very large i.e. number of photons emitted per unit time is very large.
 * 2) Highly monochrome: Since all the atoms decay from the same energy level
 * 3) Highly directional: Since the photons are emitted by stimulated emissions hence they are strongly direction dependent, while the photons from LED (light emitting diode is spontaneous emission which is direction independent)
 * 4) Coherent: The photons are identical in stimulated emission.
 * 5) Sharply focussing: Diameter of the laser spot on the screen is extremely small.