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← ScienceWhich risk increases when a pulsed laser's pulse width narrows?
A)Higher laser-induced breakdown threshold
B)Increased average emission efficiency
C)Greater likelihood of multi-photon absorption✓
D)Reduced risk of thermal lensing
💡 Explanation
Multi-photon absorption depends on high photon densities; pulse shortening concentrates energy because increased laser intensity leads to a higher probability of simultaneous multi-photon events near the laser focal point. Therefore, multi-photon absorption rises rather than single-photon processes becoming dominant under the conditions.
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