Abstract
Laser glass gain medium that can convert low cost 808nm diode laser into 2.7μm has attracted considerable interest due to its potential application for medical surgery fiber laser system. In this study, enhanced 2.7μm emission has been achieved in Er3+:germanate glass by co-doping with Nd3+ ions under the excitation of an 808nm diode laser. In the co-doped sample, the experimental results show that the harmful visible emissions via up-conversion were effectively restricted. The reduction of 1.5μm emission was also detected in the co-doped sample, which indicates significant de-excitation of 4I13/2 Er3+ ion through energy transfer and non-radiative decay in Nd3+ ions. In conclusion, the 2.7μm emission enhancement achieved was due to the increased optical absorption of 808nm, efficient energy transfer (ET) with efficiency of 81.73% between Er3+ and Nd3+ ions, and shortening the lifetime of the lower lasing level 4I13/2 Er3+ in the co-doped sample. Therefore, Er3+/Nd3+ co-doped germanate glass could be used to fabricate fiber optical gain media for 2.7μm laser generation.
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