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Laser physics basics: Identify the process that produces the first photons. Once a laser’s active medium is excited (population inversion initiated), which fundamental process produces the initial photons that start the light amplification? Choose the correct physical process.

Difficulty: Easy

Correct Answer: Spontaneous emission

Explanation:


Given
A laser medium after excitation/population inversion.


Concept/Approach
Laser action begins when an excited atom decays spontaneously, emitting a photon that then triggers stimulated emission in other excited atoms, leading to coherent amplification.


Sequence
Excitation → Spontaneous emission (seed photon) → Stimulated emission (amplification).


Final Answer
Spontaneous emission.

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