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Shockproof: Nd-alumina shows no cracking at 40W applied voltage, while Nd-YAG cracks at 25W.

Shockproof: Neodymium-alumina (left) shows no signs of cracking at 40 Watts applied voltage, while neodymium-YAG (right) cracks at 25 Watts. Image courtesy of Elias Penilla.

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