Abstract
Temperature investigation of infrared-to-visible frequency upconversion in erbium-doped tellurite glasses excited by CW laser radiation at 1540nm and under cryogenic temperatures is reported. Intense upconversion emission signals around 530, 550 and 660nm corresponding to the 2H11/2, 4S3/2, and 4F9/2 transitions to the 4I15/2 ground state were generated and studied as a function of the laser intensity and temperature. The upconversion excitation mechanism of the Er3+ ions emitting energy levels was accomplished via stepwise multiphoton absorption. The green upconversion luminescence exhibited a fivefold intensity enhancement when the temperature of the sample was varied in the range between 5 and 300K. A maximum green upconversion intensity was attained around 120K and a steady decreasing behavior for higher temperatures up to 300K was observed. A model based upon conventional rate equations was used to model the observed temperature evolution of the upconversion luminescence.
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