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This paper reports on frequency upconversion emission properties of Tm 3+ /Yb 3+ - and Ho 3+ /Yb 3+ -codoped Ga 2 O 3 –GeO 2 –Bi 2 O 3 –PbO glass upon excitation of 980nm laser diode. The dependence of the upconversion emission intensity upon the excitation power has been examined and the involved mechanisms have also been discussed...
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