This work reports the enhanced emission at 2.7 μm in Er 3+/Ho 3+-codoped fluorotellurite glass upon a conventional 980 nm laser diode. The significantly reduced green upconversion and 1.5 μm emission intensity in Er 3+/Ho 3+-codoped samples are observed. The results suggest that the Er 3+: 4I 13/2 state can be efficiently depopulated via energy transfer from Er 3+ to Ho 3+ and the detailed energy transfer mechanisms are discussed qualitatively. The energy transfer efficiency from Er 3+: 4I 13/2 to Ho 3+: 5I 7 is calculated to be as high as 67.33%. The calculated emission cross-section in Er 3+/Ho 3+-codoped fluorotellurite glass is 1.82 × 10 ？ 2 0 cm 2. This suggests that Er 3+/Ho 3+-codoped fluorotellurite glass is a potential material for 2.7 μm fiber laser.
References
[1]
Zhu, X.; Jain, R. 10W level diode-pumped compact 2.78 μm ZBLAN fiber laser. Opt. Lett. 2007, 32, 26–28, doi:10.1364/OL.32.000026.
Jackson, S.D.; King, T.A.; Pollnau, A.M. Diode-pumped 1.7 W erbium 3 μm fiber laser. Opt. Lett. 1999, 24, 1133–1135, doi:10.1364/OL.24.001133.
[4]
Tokita, S.; Murakami, M.; Shimizu, S.; Hashida, M.; Sakabe, S. Liquid-cooled 24 W mid-infrared Er3+:ZBLAN fiber laser. Opt. Lett. 2009, 34, 3062–3064, doi:10.1364/OL.34.003062.
[5]
Wang, J.S.; Vogel, E.M.; Snitzer, E. Tellurite glass: a new candidate for fiber devices. Opt. Mater. 1994, 3, 187–203, doi:10.1016/0925-3467(94)90004-3.
Mori, A.; Ohishi, Y.; Sudo, S. Erbium-doped tellurite glass fibre laser and amplifier. Electron. Lett. 1997, 33, 863–864, doi:10.1049/el:19970585.
[8]
Golding, P.S.; Jackson, S.D.; King, T.A.; Pollnau, M. Energy transfer processes in Er3+-doped and Er3+,Pr3+-codoped ZBLAN glasses. Phys. Rev. B 2000, 62, 856–864, doi:10.1103/PhysRevB.62.856.
[9]
Chou, Y.G.; Kim, K.H.; Lee, B.J.; Shin, Y.B.; Kim, Y.S.; Heo, J. Emission properties of the Er3+:4I11/2–4I13/2 transition in Er3+ and Er3+/Tm3+-codoped Ge-Ga-As-S glasses. J. Non-Cryst. Solids 2000, 278, 137–144, doi:10.1016/S0022-3093(00)00331-8.
[10]
Zhong, H.; Chen, B.; Ren, G.; Cheng, L.; Yao, L.; Sun, J. 2.7 μm emission of Nd3+, Er3+codoped tellurite glass. J. Appl. Phys. 2009, 106, 083114, doi:10.1063/1.3251345.
[11]
Zhang, L.; Yang, Z.; Tian, Y.; Zhang, J.; Hu, L. Comparative investigation on the 2.7 μm emission in Er3+/Ho3+ codoped fluorophosphate glass. J. Appl. Phys. 2011, 110, 093106, doi:10.1063/1.3658849.
Xu, R.R.; Tian, Y.; Wang, M.; Hu, L.L.; Zhang, J.J. Spectroscopic properties of 1.8 μm emission of thulium ions ingermanate glass. Appl. Phys. B 2010, 102, 109–116.
[16]
Ivanova, S.; Pelle, F. Strong 1.53 μm to NIR-VIS-UV upconversion in Er-doped fluoride glass for high-efficiency solar cells. J. Opt. Soc. Am. B 2009, 26, 1930–1938, doi:10.1364/JOSAB.26.001930.
[17]
Zou, X.; Izumitani, T. Spectroscopic properties and mechanisms of excited state absorption and energy transfer upconversion for Er3+-doped glasses. J. Non-Cryst. Solids 1993, 162, 68–80, doi:10.1016/0022-3093(93)90742-G.
[18]
Peng, B.; Izumitani, T. Optical properties, fluorescence mechanisms and energy transfer in Tm3+, Ho3+ and Tm3+-Ho3+ doped near-infrared laser glasses, sensitized by Yb3+. Opt. Mater. 1995, 4, 797–810, doi:10.1016/0925-3467(95)00032-1.
[19]
Reisfeld, R.; Hormadaly, J. Optical intensities of holmium in tellurite, calibo, and phosphate glasses. J. Chem. Phys. 1976, 64, 3207–3212, doi:10.1063/1.432659.
[20]
Xu, R.; Pan, J.; Hu, L.; Zhang, J. 2.0 μm emission properties and energy transfer processes of Yb3+/Ho3+ codoped germanate glass. J. Appl. Phys. 2010, 108, 043522, doi:10.1063/1.3468726.
[21]
Feng, L.; Wang, J.; Tang, Q.; Liang, L.; Liang, H.; Su, Q. Optical properties of Ho3+-doped novel oxyfluoride glasses. J. Lumin. 2007, 124, 187–194, doi:10.1016/j.jlumin.2006.02.017.
[22]
Zhang, X.D.; Xu, T.F.; Dai, S.X.; Nie, Q.H.; Shen, X.; Lu, L.; Zhang, X.H. Investigation of energy transfer and frequency upconversionin Er3+/Ho3+ co-doped tellurite glasses. J. Alloy Compd. 2008, 450, 306–309, doi:10.1016/j.jallcom.2006.10.097.
[23]
Pollnan, M. The route toward a diode-pumped 1 W erbium 3 μm fiber laser. IEEE J. Sel. Top. Quant. 1997, 33, 1982–1990, doi:10.1109/3.641313.
[24]
Carnall, W.T.; Fields, P.R.; Rajnak, K. Spectral Intensities of the Trivalent Lanthanides and Actinides in Solution. II. Pm3+, Sm3+, Eu3+, Gd3+, Tb3+, Dy3+, and Ho3+. J. Chem. Phys. 1968, 49, 4412–4423, doi:10.1063/1.1669892.
[25]
Stephen, A.P.; Chase, L.L.; Smith, L.K.; Kway, W.L.; Krupke, W.F. Infrared Cross—Section Measurements for Crystals Doped with Er3+, Tm3+, and Ho3+. IEEE J. Quantum Elect. 1992, 28, 2619–2630.
[26]
McCumber, D.E. Theory of Phonon Terminated Optical Masers. Phy. Rev. 1964, 134, A299–A306, doi:10.1103/PhysRev.134.A299.
[27]
Guo, Y.; Tian, Y.; Zhang, L.; Hu, L.; Chen, N.K.; Zhang, J. Pr3+-sensitized Er3+-doped bismuthate glass for generating high inversion rates at 2.7 μm wavelength. Opt. Lett. 2012, 37, 3387–3389, doi:10.1364/OL.37.003387.
[28]
Tian, Y.; Xu, R.; Zhang, L.; Hu, L.; Zhang, J. Observation of 2.7 μm emission from diode-pumped Er3+/Pr3+-codoped fluorophosphate glass. Opt. Lett. 2011, 36, 109–111, doi:10.1364/OL.36.000109.
[29]
Tikhomirov, V.K.; Méndez-Ramos, J.; Rodríguez, V.D.; Furniss, D.; Seddon, A.B. Laser and gain parameters at 2.7 μm of Er3+-doped oxyfluoride transparent glass–ceramics. Opt. Mater. 2006, 28, 1143–1146, doi:10.1016/j.optmat.2005.06.017.
