General test: self-focusing of light, convergence occurs after a strong parallel beam enters through the medium (similar to passing through a convex lens).
Self-induced transparency of light: after a short pulse of strong light enters the medium, the medium hardly absorbs its energy (almost 100% transparent).
Optical Bistability: after strong light enters the medium, there may be two stable states of high transmission or low transmission.
Two-photon absorption: under strong light, atoms or molecules in the medium absorb two photons simultaneously in one transition.
Stimulated Raman scattering: raman scattering generated by the medium under laser irradiation.
Theoretical models: non-resonant oscillator model, two-level model, bond charge model, bond parameter model, charge transfer theory, anion group theory and double-base non-structural model.
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