Abstract
Enhanced 2.0 μm emission from Ho3+ bridged by Yb3+ in Nd3+/Yb3+/Ho3+ triply doped tungsten tellurite glasses has been demonstrated upon excitation with an 808 nm laser diode. Nd3+ with high absorption cross section near 808 nm plays an important role in 2.0 μm emission by transferring pump energy to Ho3+:5I5 level. The introduction of Yb3+ could greatly enhance the 2.0 μm emission. The energy transfer efficiency from Nd3+ to Ho3+ and Yb3+ increases from 36.4% to 89.5% with the addition of 5 mol. % Yb2O3, and the energy transfer coefficient from Nd3+ to Yb3+ (29.65 × 10−40 cm6/s) is larger than that from Nd3+ to Ho3+ (3.87 × 10−40 cm6/s). The underlying mechanism is analyzed by means of photoemission spectroscopy and lifetime measurement. The combination of Nd3+/Yb3+/Ho3+ could open up a possibility to realize high efficient 2.0 μm lasing from Ho3+, which could operate at an 808 nm diode laser pump.
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