Spectroscopic Properties of Tm3+ ions in Tm3+/Yb3+ Codoped Tellurite Glass

Absorption coefficience of Tm 3+ ions in Tm 3+ /Yb 3+ codoped tellurite glass have been analyzed by using the J-O theory. The J-0 parameters are calculated to be Ω 2 = 11.11×10 -20 cm 2 , Ω 4 = 3.5×10 -20 cm 2 and Ω 6 = 3.6×10 -20 cm 2 . Spontaneous radiative transition probabilities, branching ratios and radiative life time of Tm 3+ ions are also calculated, the calculation results indicate that it is difficult to get S-band amplification through single 808 nm laser pump in this glass, this is tested by 808 nm single wavelength pump experiment. The Yb 3+ codoping with Tm 3+ and energy transfer process between them make 980 nm single wavelength pump scheme possible to get S-band amplification, experiment results indicate that 980 nm pump energy absorbed by Yb 3+ is transferred to Tm 3+ , consequently, the low cost 980 nm pump scheme could make it become promising material for S-band amplification.