I am aware of crystals being energised with internal photoelectric effect, and then, somehow they are provoked to release the energy at once? The last part is what i don’t understand. How can a photon force emission of other photons? Or am i getting this wrong entirely?
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Lasers are often not crystals. The atoms are energized *somehow* (exactly how varies).
They are *stimulated* to *emit* that energy as light. This is the “SE” part of a “LASER”. This step is key. When a photon passes through, it causes the atom to release its energy and create another photon. As the light bounces in the cavity it frees more and more photons all moving in the same direction, finally creating the beam.
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