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SPASER nanoparticle (NP), with small size, ultranarrow spectral‐line and good biocompatibility, is a potential biomedical nanoprobe. However, owning to the striking light absorption capacity of Au‐resonator, huge energy could accumulate under strong pumping‐laser, which would lead to poor photo‐stability and unexpected photo‐damage to SPASER NP, and is harmful to its future practical application but...