Spectroscopic analysis and efficient diode-pumped 2.0m emission in Ho(3+)/Tm(3+) codoped fluoride glass.
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abstract
Intense 2.0m emission has been obtained in Ho(3+)/Tm(3+) codoped ZBLAY glass pumped by common laser diode. Three intensity parameters and radiative properties have been determined from the absorption spectrum based on the Judd-Ofelt theory. The 2m emission characteristics and the energy transfer mechanism upon excitation of a conventional 800nm laser diode are investigated. Efficient Tm(3+) to Ho(3+) energy transfer processes have been observed in present glass and investigated using steady-state and time-resolved optical spectroscopy measurement. The energy transfer microscopic parameter has been calculated with the Inokuti-Hirayama and Frster-Dexter models. High quantum efficiency of 2m emission (80.35%) and large energy transfer coefficient from Tm(3+) to Ho(3+) indicates this Ho(3+)/Tm(3+) codoped ZBLAY glass is a promising material for 2.0m laser.