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In Ref. 1 authors supported that a four-fold coordinated four-valent chromium ion Cr t 4 + may be used as a sensitizer of luminescence of some rear-earth ions in YAG crystal, but no oscillation experiments had been performed. For the first time we report about laser action on the 3H4→ 3H6transition of Tm3+ion when it is excited due to energy transfer from Cr t 4 + ions.

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