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← ScienceWhich risk increases greatly when a pulsed laser's repetition rate nears the relaxation time of a saturable absorber?
A)Excited-state absorption dominates✓
B)Two-photon absorption becomes negligible
C)Ground-state bleaching minimizes
D)Frequency doubling becomes more efficient
💡 Explanation
When the repetition rate matches relaxation time, fewer absorber molecules relax to ground state before the next pulse. Excited-state absorption increases because population inversion isn't fully reset; therefore transmission decreases rather than staying stable or improving nonlinearity.
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