Which risk increases greatly when a pulsed laser's repetition rate nears the relaxation time of a saturable absorber?

💡 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.

• Which risk increases when a fluid's Reynolds number passes a critical value in a pipe network?
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• Which outcome will result when continually removing product from a reversible exothermic reaction at constant elevated temperature?
• Which mechanism dictates hydrogen atom's wave function shape?
• Which mechanism causes exciton formation rather than free carriers in a semiconductor with a significant band gap under optical excitation?
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