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Which risk increases when a pulsed laser's repetition rate approaches a material's thermal relaxation time?

A)Ablation threshold reduction occurs
B)Stimulated Brillouin scattering decline
C)Self-phase modulation strengthens
D)Four-wave mixing efficiency declines

💡 Explanation

Ablation threshold reduction increases because heat accumulation exceeds dissipation via thermal diffusion; this thermal ratchet outcome lowers the needed energy, rather than the decline or strengthening of other optical phenomena in different scenarios.

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