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Which risk increases when optical pumping of a solid-state laser shifts off-peak?

A)Gain medium thermal lens distortion
B)Spontaneous emission amplification decreases
C)Resonator mirror reflectivity decays
D)Q-factor cavity collapses predictably

💡 Explanation

Thermal lens distortion increases because non-radiative relaxation dominates via phonon emission, causing uneven heating. Therefore, the refractive index gradients disrupt the beam profile, rather than efficient lasing that occurs with optimal wavelength alignment.

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