distinguish between spontaneous and stimulated emission
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1 Answer
| SR No | Spontaneous emission | Stimulated emission |
|---|---|---|
| 1 | The transition of an electron from the excited state to the ground state happens as a result of the natural tendency of the electron without the action of any external agent. The radiation produced as a result of such transitions is called as spontaneous radiation. | Stimulated emission of radiation is the process whereby photons are used to generate other photons that have exact phase and wavelength as that of parent photon. |
| 2 | This phenomenon is found in LEDs, Fluorescent tubes. | This is the key process of formation of laser beam. |
| 3 | There is no population inversion of electrons in LEDs. | Population inversion is achieved by various ‘pumping’ techniques to get amplification giving the LASER its name “Light amplification by stimulated emission of radiation.” |
| 4 | No external stimuli required. | Thus stimulated emission is caused by external stimuli. |
| 5 |