Abstract

Visible IR-to-green photon-avalanche upconversion is reported in an Ho3+ singly doped βNa(Y1.5Na0.5)F6 crystal under 980nm excitation. Upconverted green, red, and IR emissions are observed at 540, 645, and 751nm, respectively. Temporal evolution and excitation power dependent upconversion intensity are measured, suggesting that a photon-avalanche mechanism is responsible for the upconversion process. It is believed that an efficient cross relaxation (S25,I85)(I65,I65) mainly performs the population of I65 excited state, resulting in the intense photon-avalanche upconversion emission in the synthesized samples.

© 2008 Optical Society of America

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