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Wiktionary
photosensitize

vb. (context transitive English) to make something photosensitive

WordNet
photosensitize

v. make (an organism or substance) sensitive to the influence of radiant energy and especially light [syn: photosensitise]

Usage examples of "photosensitize".

I suspect the weapon is also photosensitized to detonate under a high-intensity beam of light.