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Differentiate between spontaneous and stimulated emission.
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written 5.8 years ago by
teamques10
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| 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 |  |
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written 5.8 years ago by
teamques10
★ 68k
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SPONTANEOUS EMISSION
- It is a natural process.
- Can not be controlled.
- No multiplication of photons takes place.
- Not useful for LASER.
STIMULATED EMISSION.
Artificial, induced process.
Can be controlled effectively.
Multiplication of photons takes place.
Essential for LASER.
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