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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The key is population inversion, which means that there are more excited atoms than ground state atoms. Those are unstable and just looking for an excuse to emit light, and when they’re nudged by a photon, they’ll do so.
A ground state atom would absorb a photon instead, so there needs to be fewer of them around in order for light amplification to occur.
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