Which effect on a sample results when a focused, pulsed laser induces two-photon absorption?

💡 Explanation

Confined material ablation occurs because two-photon absorption deposits energy only at the focal point via nonlinear absorption. This creates localized excitation of the material; therefore, ablation starts at the focus, rather than surface damage, and removes material.

• Which phenomenon causes spectral broadening in femtosecond laser pulses?
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