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Which outcome occurs when rapid cooling sets up large thermal gradients in an alumina crystal used as a high-power laser gain medium?

A)Thermally-induced stress fractures form
B)Increased lasing efficiency manifests
C)Index of refraction becomes uniform
D)Pumping threshold significantly decreases

💡 Explanation

Thermally-induced stress fractures form because rapid cooling causes uneven contraction leading to large thermal gradients, which exceeds the crystal's tensile strength, therefore fracture occurs rather than uniform contraction because the crystal defects concentrate stress.

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