In Laser Stimulated Emission?

In laser action the stimulating emission triggers a chain reaction in which the radiation from one atom stimulates another in succession until all the excited atoms in the system have returned to normalcy. In doing so, coherent monochromatic light (light of a single wavelength) is emitted.

How is stimulated emission achieved in laser?

Stimulated emission pumping occurs when one laser excites a molecule to an individual quantum level in an excited electronic state and a second laser dumps a large fraction of the excited state back down to vibrational levels of the ground electronic state.

What is meant by stimulated emission of radiation?

Stimulated emission of radiation: When an electron is in a different energy level of the fundamental level and returns to the ground state through an incident photon, a new photon is generated with exactly the same frequency, direction and phase to the incident photon.