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← ScienceWhich mechanism causes optical damage in high-powered laser amplifiers?
A)Two-photon absorption creates free carriers✓
B)Raman scattering generates strong back-reflections
C)Brillouin scattering shifts frequency drastically
D)Self-focusing increases path-length instability
💡 Explanation
Two-photon absorption creates free carriers, leading to increased absorption and thermal runaway within the laser material, because energetic photons excite electrons across the bandgap. Therefore, crystal melting occurs rather than parametric oscillation since thermal effects dominate.
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