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Which effect occurs when pulsed laser beam propagates?

A)Self-phase modulation creates new frequencies
B)Bragg diffraction decreases refractive index
C)Stimulated emission cools the medium
D)Population inversion reduces beam divergence

💡 Explanation

Self-phase modulation generates new frequencies because the Kerr effect induces changes in the refractive index proportional to the intensity of the pulse. This is nonlinear wave propagation in the medium therefore frequency chirping occurs, rather than stimulated emission or population inversion effects.

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