Energy-transfer-upconversion models, their applicability and breakdown in the presence of spectroscopically distinct ion classes: A case study in amorphous Al2O3:Er3+

The influence of energy migration and energy-transfer upconversion (ETU) among neighboring Er3+ ions on luminescence decay and steady-state population densities in Al2O3:Er3+ thin films is investigated by means of photoluminescence decay measurements under quasi-CW excitation. The experimental results are analyzed by several models. As expected from the basic physical assumptions made by these models, only Zubenko’s microscopic model provides good agreement with the experimental data, while other donor−acceptor treatments found in the literature are unsuccessful and the macroscopic rateequation approach provides meaningful results only when misinterpreting the intrinsic lifetime as a free fit parameter. Furthermore, a fast quenching process induced by, e.g., active ion pairs and clusters, undesired impurities, or host material defects such as voids, that is not revealed by any particular signature in the luminescence decay curves because of negligible emission by the quenched ions under quasi-CW excitation, is verified by pump-absorption experiments. This quenching process strongly affects device performance as an amplifier. Since Zubenko’s microscopic model treats all ions equally, it is unable to describe a second, spectroscopically distinct class of ions involving a fast quenching process. The model is extended to take into account the fraction of quenched ions. This approach finally leads to excellent agreement between the luminescence-decay, pump-absorption, and small-signal-gain experiments within the frame of a single theoretical description.

[1]  Mk Meint Smit,et al.  Upconversion in Er-implanted Al2O3 waveguides , 1996 .

[2]  Edward H. Bernhardi,et al.  Impact of luminescence quenching on relaxation-oscillation frequency in solid-state lasers , 2012 .

[3]  B. Jaskorzynska,et al.  Concentration-dependent upconversion in Er/sup 3+/-doped fiber amplifiers: Experiments and modeling , 1991, IEEE Photonics Technology Letters.

[4]  M. Pollnau,et al.  Nd-Doped Polymer Waveguide Amplifiers , 2010, IEEE Journal of Quantum Electronics.

[5]  Garnier,et al.  Excited-state-absorption and upconversion studies of Nd3+-doped single crystals Y3Al5O12, YLiF4, and LaMgAl11O19. , 1995, Physical review. B, Condensed matter.

[6]  Dimitri Geskus,et al.  Gain bandwidth of 80 nm and 2 dB/cm peak gain in Al2O3:Er3+ optical amplifiers on silicon , 2010 .

[7]  M. Pollnau,et al.  High-gain Al2O3:Nd3+ channel waveguide amplifiers at 880 nm, 1060 nm, and 1330 nm , 2010 .

[8]  Mikhail A. Noginov,et al.  Study of luminescence concentration quenching and energy transfer upconversion in Nd-doped LaSc 3 (BO 3 ) 4 and GdVO 4 laser crystals , 1998 .

[9]  M. Tonelli,et al.  Microscopic treatment of upconversion in Nd 3+ -doped samples , 2003 .

[10]  Markus Pollnau,et al.  Near-infrared to visible upconversion in Er 3+ doped Cs 3 Lu 2 Cl 9 , Cs 3 Lu 2 Br 9 , and Cs 3 Y 2 I 9 excited at 1.54 µm , 1999 .

[11]  W. Miniscalco.  Erbium-doped glasses for fiber amplifiers at 1500 nm , 1991 .

[12]  Günter Huber,et al.  High quantum efficiency YbAG-crystals , 2007 .

[13]  Ti Chuang,et al.  Energy transfer up-conversion and excited state absorption of laser radiation in Nd:YLF laser crystals , 1996 .

[14]  T. Kushida.  Energy Transfer and Cooperative Optical Transitions in Rare-Earth Doped Inorganic Materials. III. Dominant Transfer Mechanism , 1973 .

[15]  D. Hanna,et al.  Lifetime quenching in Yb-doped fibres , 1997 .

[16]  M. Pollnau,et al.  Energy recycling versus lifetime quenching in erbium-doped 3-/spl mu/m fiber lasers , 2002 .

[17]  M. Pollnau,et al.  Reliable Low-Cost Fabrication of Low-Loss $\hbox{Al}_{2}\hbox{O} _{3}{:}\hbox{Er}^{3+}$ Waveguides With 5.4-dB Optical Gain , 2009, IEEE Journal of Quantum Electronics.

[18]  D. Strauch,et al.  Lattice dynamics of sapphire (Al2O3) , 1993 .

[19]  Stuart D. Jackson,et al.  Energy-transfer processes in Er3+-doped and Er3+,Pr3+-codoped ZBLAN glasses , 2000 .

[20]  W. Grant,et al.  Role of Rate Equations in the Theory of Luminescent Energy Transfer , 1971 .

[21]  Réal Vallée,et al.  20 W passively cooled single-mode all-fiber laser at 2.8 μm. , 2011, Optics letters.

[22]  M. Pollnau,et al.  Fabrication of low-loss channel waveguides in Al2O3 and Y2O3 layers by inductively coupled plasma reactive ion etching , 2007 .

[23]  J. Heber,et al.  Concentration-dependent fluorescence-quenching in La1−xPrxP5O14 , 1980 .

[24]  S. Houde-Walter,et al.  Erbium partitioning in a heavily doped transparent glass ceramic. , 2005, Optics letters.

[25]  R. Wyatt,et al.  Spectroscopy Of Rare Earth Doped Fibres , 1990, Other Conferences.

[26]  I. A. Shcherbakov,et al.  DIFFERENT MECHANISMS OF NONLINEAR QUENCHING OF LUMINESCENCE , 1997 .

[27]  J. Eiras,et al.  Effect of Nd3+ concentration quenching in highly doped lead lanthanum zirconate titanate transparent ferroelectric ceramics , 2007 .

[28]  Nguyen,et al.  Dynamics and spectroscopy of infrared-to-visible upconversion in erbium-doped cesium cadmium bromide (CsCdBr3:Er3+). , 1992, Physical review. B, Condensed matter.

[29]  F. Priolo,et al.  Cooperative upconversion in erbium-implanted soda-lime silicate glass optical waveguides , 1995 .

[30]  D. C. Hanna,et al.  Upconversion-induced heat generation and thermal lensing in Nd:YLF and Nd:YAG , 1998 .

[31]  B. Viana,et al.  Optical properties and energy transfer among Nd3+ in Nd:Ca2Al2SiO7 crystals for diode pumped lasers , 1994 .

[32]  M. Inokuti,et al.  Influence of Energy Transfer by the Exchange Mechanism on Donor Luminescence , 1965 .

[33]  Francesca Bonfigli,et al.  The interplay of self-trapping and self-quenching for resonant transitions in solids; role of a cavity , 2001 .

[34]  D. L. Dexter.  A Theory of Sensitized Luminescence in Solids , 1953 .

[35]  M. Monerie,et al.  Modeling of pair-induced quenching in erbium-doped silicate fibers , 1993 .

[36]  F. Auzel,et al.  Materials and devices using double-pumped-phosphors with energy transfer , 1973 .

[37]  D B Ostrowsky,et al.  Clustering-induced nonsaturable absorption phenomenon in heavily erbium-doped silica fibers. , 1995, Optics letters.

[38]  Anne C. Tropper,et al.  High-inversion densities in Nd:YAG-upconversion and bleaching , 1998 .

[39]  M. Pollnau,et al.  Near-infrared to visible photon upconversion processes in lanthanide doped chloride, bromide and iodide lattices , 2000 .

[40]  Nasser N Peyghambarian,et al.  Cooperative upconversion and energy transfer of new high Er 3+ - and Yb 3+ –Er 3+ -doped phosphate glasses , 2000 .

[41]  F. Auzel.  Upconversion and anti-Stokes processes with f and d ions in solids. , 2004, Chemical reviews.

[42]  Th. Förster.  Zwischenmolekulare Energiewanderung und Fluoreszenz , 1948 .

[43]  John A. Caird,et al.  Quantum efficiency and excited-state relaxation dynamics in neodymium-doped phosphate laser glasses , 1991 .

[44]  Heinz P. Weber,et al.  Explanation of the cw operation of the Er3+ 3-µm crystal laser , 1994 .