Question

The principle of laser action involves

• A. Amplification of particular frequency emitted by the system
• B. Population inversion
• C. Stimulated emission
• D. All of the above

Answer 1

The correct option is D

All of the above

Explanation for the correct option:

In the case of option D,

1. A laser is a device that emits a powerful light beam.
2. The acronym LASER itself defines the fundamental workings of a laser. Light Amplification by Stimulated Emission of Radiation is the official name for a laser.
3. A laser beam is a concentrated beam of light with many photons attached to it.
4. Let's assume that, during a time interval of 10 seconds, one electron is present in some energy state.
5. If the energy of a photon triggers this electron, the electron will go to a lower energy state and emit a photon spontaneously.
6. We obtain the square of photon emission as the number of photons striking the electrons in the higher energy state.
7. Since we are forcing the emission of photons, This technique is known as induced emission or stimulated emission.
8. Laser actions include amplification of particular frequency, population inversion, and stimulated emission.

Hence, option D is the correct answer.