Mid-Infrared Emission Characteristic and Energy Transfer of Ho3+-Doped Tellurite Glass Sensitized by Tm3+
- 550 Downloads
We report on 2.0-μm emission characteristic and energy transfer of Ho3+-doped tellurite glass sensitized by Tm3+ upon excitation of a conventional 808 nm laser diode. The Judd-Ofelt strength parameters, spontaneous radiative transition probabilities and radiative lifetime of Ho3+ have been calculated from the absorption spectra by using the Judd-Ofelt theory. Significant enhancement of 2.0-μm emission of Ho3+ has been observed with increasing Tm3+ doping up to 0.7 mol%. The energy transfer coefficient of the forward Tm3+→Ho3+ is approximately 17 times larger than that of the backward Tm3+←Ho3+ energy transfer. Our result indicates that the maximum gain of 2.0-μm emission, assigned to the transition of 5I7→5I8 of Ho3+, might be achieved from the tellurite glass at the concentration of 0.5 mol% of Tm2O3 and 0.15 mol% of Ho2O3. The high gain coefficient and quantum efficiency (1.16) along with the large value of the product of the stimulated emission cross-section and the measured radiative lifetime (4.12×10−27 m2s) of the Ho3+/Tm3+-codoped tellurite glasses might find potential applications in efficient 2.0-μm laser.
KeywordsMid-infrared laser Fluorescence Energy transfer Gain Tellurite glass
The authors would like to thank Mr. ZM Feng for technical assistance. This work is jointly supported by NSFC (50472053), NCET (04-0823) and GSTD (2006J1-C0491).
- 4.Richards BDO, Shen SX, Jha A (2005) Spectroscopy of Tm-Ho co-doped tellurite glass for mid-IR fibre lasers in 1.8–2.2 μm. Proc SPIE 5984(7):1–8Google Scholar
- 7.Johson LJ, Boyd GD, Nassau K (1962) Optical maser characteristics of Ho3 + in CaWO4. Proc IAE 50:87–90Google Scholar
- 20.Zhang QY, Li T, Jiang ZH (2005) 980 nm laser-diode-excited intense blue upconversion in Tm3+/Yb3+-codoped gallate-bismuth-lead glasses. Appl Phys Lett 87:171911; Zhang QY, Li T (2006) Effects of PbF2 doping on structure and spectroscopic properties of Ga2O3–GeO2–Bi2O3–PbO glasses doped with rare earths. J Appl Phys 90:033510CrossRefGoogle Scholar
- 24.Press WH, Hu JW, Zhao ZY, Xue YH (2005) Numerical recipes in C++: the art of scientific computing. Publishing House of Electronics Industry, BeijingGoogle Scholar
- 25.Volkov EA (1989) Numerical methods. Hemisphere Pub Corp., New YorkGoogle Scholar