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← ScienceWhich disruptive outcome occurs when excessively increasing laser pulse durations?
A)Decreased optical parametric amplification
B)Increased two-photon absorption
C)Self-focusing causes filamentation✓
D)Enhanced stimulated Raman scattering
💡 Explanation
Self-focusing causes filamentation because the Kerr effect induces a refractive index gradient, therefore the beam collapses spatially, rather than dispersing, because short pulses limit thermal effects and allow the nonlinearity to dominate.
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