Bibliografie tematiche / RARE EARTH DOPED

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Letteratura scientifica selezionata sul tema "RARE EARTH DOPED"

Autore: Grafiati
Pubblicato: 16 settembre 2023

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Articoli di riviste sul tema "RARE EARTH DOPED"

1

Petermann, K., G. Huber, L. Fornasiero, S. Kuch, E. Mix, V. Peters e S. A. Basun. "Rare-earth-doped sesquioxides". Journal of Luminescence 87-89 (maggio 2000): 973–75. http://dx.doi.org/10.1016/s0022-2313(99)00497-4.

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Xie, Rong Jun, Mamoru Mitomo e Naoto Hirosaki. "Luminescence Properties of Rare-Earth Doped α-SiAlONs". Key Engineering Materials 317-318 (agosto 2006): 797–802. http://dx.doi.org/10.4028/www.scientific.net/kem.317-318.797.

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Abstract (sommario):
Rare-earth doped Ca-α-SiAlON phosphors, with the compositions of (Ca1-3/2xREx)m/2Si12-m-nAlm+nOnN16-n (RE = Ce, Sm, Eu, Tb, Yb and Dy, 0.5 ≤ m = 2n ≤ 3.0), were prepared by reaction at 1700oC for 2h under 10 atm N2. The concentration of rare earths varied from 3 to 30 at% with respect to Ca. The photoluminescence properties of the powders were investigated at room temperature. The results show that (i) strong visible emissions are observed in rare-earth doped Ca-α-SiAlONs; (ii) the emission properties can be optimized by tailoring the activator concentration and the composition of the α-SiAlON host crystal; and (iii) the yellow Eu2+-doped Ca-α-SiAlON phosphors can be used in warm white LEDs.
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3

Dejneka, M. J., A. Streltsov, S. Pal, A. G. Frutos, C. L. Powell, K. Yost, P. K. Yuen, U. Muller e J. Lahiri. "Rare earth-doped glass microbarcodes". Proceedings of the National Academy of Sciences 100, n. 2 (6 gennaio 2003): 389–93. http://dx.doi.org/10.1073/pnas.0236044100.

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4

Zavada, John M., Tom Gregorkiewicz e Andrew J. Steckl. "Rare earth doped semiconductors III". Materials Science and Engineering: B 81, n. 1-3 (aprile 2001): 1–2. http://dx.doi.org/10.1016/s0921-5107(00)00666-8.

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5

Vetrone, Fiorenzo. "(Invited) Rare Earth Doped Nanoparticles". ECS Meeting Abstracts MA2022-02, n. 36 (9 ottobre 2022): 1319. http://dx.doi.org/10.1149/ma2022-02361319mtgabs.

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Luminescent nanomaterials that can be excited, as well as emit, in the near-infrared (NIR) have been investigated for use in a plethora of applications including nanomedicine, nanoelectronics, biosensing, bioimaging, photovoltaics, photocatalysis, etc. The use of NIR light for excitation mitigates some of the drawbacks associated with high-energy (UV or blue) excitation, for example, little to no background autofluorescence from the specimen under investigation as well as no incurred photodamage. Moreover, one of the biggest limitations is of course, that of penetration. As such, NIR light can penetrate tissues much better than high-energy light especially when these wavelengths lie within the three biological windows (BW-I: 700-950, BW-II: 1000-1350, BW-III: 1550-1870 nm) where tissues are optically transparent. At the forefront of NIR excited nanomaterials are rare earth doped nanoparticles, which due to their 4f electronic energy states can undergo conventional (Stokes) luminescence and emit in the three NIR biological windows. However, unlike other classes of nanoparticles, they can also undergo a multiphoton process (known as upconversion) where the NIR excitation light is converted to higher energies resulting in anti-Stokes luminescence spanning the UV-visible-NIR regions. Perhaps the biggest impact of such materials would be in the field of disease diagnostics and therapeutics, now commonly referred to as theranostics. Due to the versatility of their optical properties, it now becomes possible to generate high-energy light (UV or blue) in situ to trigger other light activated therapeutic modalities (i.e. drug release) while using the NIR emission for diagnostics (i.e. bioimaging, nanothermometry). Here, we present the synthesis of various NIR excited (and emitting) rare earth doped core/shell (and multishell) nanoparticles and demonstrate how their luminescence properties can be exploited for potential use in diverse biomedical applications.
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Sushama, D., e P. Predeep. "Thermal and Optical Studies of Rare Earth Doped Tungston–Tellurite Glasses". International Journal of Applied Physics and Mathematics 4, n. 2 (2014): 139–43. http://dx.doi.org/10.7763/ijapm.2014.v4.271.

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7

Bai, Tao, e Shi Gen Zhu. "Preparation and Properties of Rare Earth-Doped TiO2 Thin Films by Sol-Gel Process". Advanced Materials Research 1033-1034 (ottobre 2014): 1235–38. http://dx.doi.org/10.4028/www.scientific.net/amr.1033-1034.1235.

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Rare earth doped titaniumdioxide (TiO2) thin films (rare earth-doped TiO2) have been successfully prepared on a glass substrate by a sol–gel route. After the rare earth-doped TiO2thin films were calcined at 773K for 1h, the effect of rare earth-doping on the properties were investigated using X-ray diffraction (XRD), scanning electronmicroscopy (SEM), ultraviolet–visible spectroscopy and thermogravimetric techniques (TG/DTG). The XRD results showed that rare earth-doped TiO2thin films contained only a single crystalline phase of anatase TiO2after calcining at 773K for 1h. SEM micrographs showed that rare earth-doped TiO2thin films have smooth surfaces containing granular nanocrystallines and are without cracks. The UV–vis absorption spectra showed that the absorption of the rare earth-doped TiO2thin films has a red-shift. From ambient to 1273K, it is about 12% of mass loss because of the volatilizing of water and organic and the phase transformation.
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Simoncic, Petra, e Alexandra Navrotsky. "Energetics of rare-earth-doped hafnia". Journal of Materials Research 22, n. 4 (aprile 2007): 876–85. http://dx.doi.org/10.1557/jmr.2007.0133.

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The enthalpies of formation of rare-earth (RE)-doped Hf1−xRExO2−x/2 solid solutions (RE = Sm, Gd, Dy, Yb; x = 0.25 to 0.62) with respect to the oxide end members, monoclinic HfO2 and C-type REO1.5, were determined using oxide melt solution calorimetry. The enthalpies of formation fit a function quadratic in composition. The strongly negative interaction parameters in all solid solutions confirm a strong tendency for short-range order. Though strongly negative for all systems, the interaction parameters become less negative with increasing ionic potential (decreasing RE radius). Crystallization energetics were investigated for amorphous coprecipitation products with x = 0.4. The energy difference between the crystalline (fluorite and pyrochlore) and amorphous phases decreases with decreasing dopant radius. This suggests that systems doped with small RE ions have more similar local structures in the fluorite and amorphous phases. These observations may result in a smaller kinetic barrier to recrystallization and account for the greater radiation resistance of materials with smaller RE cations.
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HU, Qiang, Xue BAI e Hong-wei SONG. "Rare Earth Ion Doped Perovskite Nanocrystals". Chinese Journal of Luminescence 43, n. 01 (2022): 8–25. http://dx.doi.org/10.37188/cjl.20210330.

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FUJIMURA, Masatoshi. "Rare-earth doped LiNbO3 waveguide lasers". Review of Laser Engineering 27, Supplement (1999): 138–39. http://dx.doi.org/10.2184/lsj.27.supplement_138.

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Tesi sul tema "RARE EARTH DOPED"

1

Lincoln, John Roderick. "Spectroscopy of rare earth doped glasses". Thesis, University of Southampton, 1992. https://eprints.soton.ac.uk/399194/.

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An extensive investigation of the spectroscopy of rare earth doped glasses is presented. Such investigations are particularly important since they provide an insight into the physical processes affecting rare earth doped fibre devices. It is a central aim of this work to demonstrate how such devices can be improved by systematic changes to the host glass. Resonant fluorescence studies of thulium doped aluminosilicate and germanosilicate glass systems show that there are systematic variations in the Tm3+ site within the glass structure, indicating the non-random nature of the rare earth site. Fluorescence lifetime measurements in these silicate systems show a significant shortening of thulium energy level lifetimes when preforms are pulled into fibres, independent of the mechanism of decay. Furthermore, it is shown that multiphonon decay and therefore the vibrational properties of the host have a pivotal role in determining device performance. Raman spectra of a range of glass hosts are measured and analysed by new methods to enable accurate comparisons of vibrational properties to be made. Examination of the thulium 2µm laser system indicates that glasses with maximum vibrational energies of ~920cm-1 would give improved device performance. Based on these calculations the world's first lead-germanate based optical fibre was fabricated and fully characterised. Predicted improvements in thulium performance over fluoride or silicate systems are realised. Studies of the erbium-ytterbium 1.5µm amplifier system through Raman and lifetime measurements show that erbium site is determined purely by the ratio of phosphorus to aluminium in a silicate glass composition. It is shown that the type of erbium site determines the degree of vibrational coupling of the erbium to the highest energy vibrational modes of the glass. This coupling is linked to the performance of Er-Yb 1.5µm fibre amplifiers. Non-exponential decay of rare earth fluorescence frequently occurs and it is shown that such decays can easily result from purely single ion multiphonon decay processes when the rare earth is in a glassy host. Furthermore, a single stretched exponential function is shown to fit all observed and modelled non-exponential decays. Use of this function enables comparisons of the degree of non-exponentiality and time evolution of such decays to be made.
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2

Ardicoglu, Burcu. "Synthesis Of Rare-earth Doped Lithium Triborate". Master's thesis, METU, 2005. http://etd.lib.metu.edu.tr/upload/3/12606354/index.pdf.

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Research in the field of non-linear optical (NLO) devices lead to an increasing interest in new borate compounds, capable of expanding the frequency range provided by common laser sources. Lithium triborate (LBO) is a newly developed ideal non-linear optical crystal used in laser weapon, welder, radar, tracker, surgery, communication, etc. Borates containing rare-earth elements are of great interest since they are found to be superior in non-linear optical applications. In this study, synthesis and identification of rare-earth doped lithium triborate was carried out. Lithium triborate was produced from the solid-state reaction. LBO was then doped with some rare-earth elements (Gd, La, Y) in several different concentrations. Appropriate quantities of Li2CO3 and H3BO3, weighted separately, were mixed and finely powdered. Then, the mixture was heated at 750 º
C for 14 hrs. The expected reaction is given below. Li2CO3 + 6H3BO3 -->
2LiB3O5 + CO2 + 9H2O Prepared LiB3O5 and Gd2O3, La2O3 and Y2O3 samples were weighed separately at different concentrations and ground together. The mixture was then heated at 750 º
C for 7 hrs. Characterization of the new products was done by X-Ray Diffraction (XRD) and Infrared (IR) analysis. Differential Thermal Analysis (DTA) was used for examination of the thermal properties of the compounds, morphology of new compounds was observed by Scanning Electron Microscopy (SEM). The compounds are then subjected to thermoluminescence (TL) studies. From the XRD studies, no change in the LBO phase related to the addition of rareearth elements was observed. However, peaks of those elements were also become apparent. IR analysis showed that there is no change related to B-O link with the addition of rare earth elements. DTA studies showed that the melting point of LBO decreases with the addition of rare earth elements. In the SEM images, two phases belonging to particles of rare earth elements and lithium triborate were observed clearly. With the TL analysis, it was considered that the samples show dose response but also it was realized that they are affected by fading.
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Shalibeik, Hotan. "Rare-earth-doped fiber lasers and amplifiers". Göttingen Cuvillier, 2007. http://bvbr.bib-bvb.de:8991/F?func=service&doc_library=BVB01&doc_number=016360105&line_number=0001&func_code=DB_RECORDS&service_type=MEDIA.

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Karali, Turgay. "Luminescence studies of rare earth doped dosimeters". Thesis, University of Sussex, 1999. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.298733.

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Chen, Zhi-jie. "Double-clad rare-earth doped fibre devices". Thesis, University of Southampton, 1997. https://eprints.soton.ac.uk/394562/.

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This thesis reports on the exploitation of the cladding pumping technique to scale the output power of rare-earth (Er3+, Er3+/Yb3+, Yb3+, and Nd3+) doped fibre amplifiers and lasers, and on the study of alternative pumping schemes and applications. In the first three chapters, the introduction of the cladding pumping scheme, its basic fibre geometries and fundamental analyses of double-clad fibres and their devices are presented. Chapter 4 describes an investigation of various Er3+-doped and Yb3+ co-doped fibre devices. An Er3+/Yb3+-doped SM fibre amplifier pumped in the 820 nm band can not only avoid the excited state absorption (ESA) peaks of Er3+ at 800 and 840 nm, but also have a higher ratio of ground state absorption to ESA than that of Er3+ fibres. This enables a high gain amplifier with a much shorter fibre length. An experimental study of cladding pumped Er3+/Yb3+ fibres in amplifier and laser forms shows the simplicity of power scaling and brightness conversion from high-power large-area multimode laser diodes into a single diffraction-limited fibre mode, and thus scales the output powers. Efficient operation of a three-level Er3+-doped double-clad fibre in both laser and amplifier forms is described. The fibre design of a low area ratio of the inner cladding to the core reduces the threshold to an acceptable level. The study of bending effects in large area ratio double-clad fibres indicates that a fibre having a concentric geometry can have nearly as high an efficiency as an eccentric core geometry if periodic bending is employed to promote mode scrambling. In contrast, double-clad fibres with eccentric cores and rectangular inner claddings were found to be relatively insensitive to bending. In order to obtain high-peak-power pulsed sources, various kinds of novel pulsed fibre lasers have been investigated. These include a cladding pumped Nd3+ Q-switched fibre laser, an enhanced Q-switched double-clad fibre laser, a Q-switched Er3+ fibre laser double-clad fibre with a large mode-area core, and a picosecond mode-locked Yb3+fibre laser. Cladding pumped amplification of short pulses can extract high energy stored in doped fibres, thus obtain pulses with high peak power and energy.
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Bhutta, Tajamal. "Novel rare-earth-doped planar waveguide lasers". Thesis, University of Southampton, 2002. https://eprints.soton.ac.uk/15483/.

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The planar guided-wave geometry is compatible with a wide range of materials, waveguidearchitectures and fabrication techniques. This thesis reports a series of studies of rare-earth-doped planar waveguide lasers, exploiting and extending the diverse range of possibilities that can be applied to planar technology. The areas investigated include the characterisation of guided-wave lasers produced by novel fabrication techniques, the design and implementation of new channel and planar waveguide structures and the demonstration of compact diode-bar pumped planar waveguide lasers. Laser operation of buried planar waveguides fabricated by a novel solid-state ion-exchange technique based on direct bonding is reported. The fabrication process allows buried waveguide structures to be fabricated by a single-step process, and the resulting guides are shown to have optical losses of < 0.4 dB/cm. Direct UV writing is utilised to fabricate multiple channel sources on this buried platform, and absorbed pump power thresholds as low as 3 mW are demonstrated. These structures offer a new and versatile route to the large-scale production of low-loss components for glass integrated-optics. Lanthanum fluoride thin-films fabricated by molecular beam epitaxy are investigated. The first laser action from a dielectric waveguide fabricated by molecular beam epitaxy is demonstrated using Nd-doped LaF3 thin films grown on CaF2 substrates. Channel waveguide lasers are designed and fabricated on these thin films by two techniques; ion-beam etching and a novel technique that employs a photo-definable polymer. These structures have a maximum phonon-energy of 380 cm-1, which constitutes the lowest phonon energy dielectric to show laser waveguide emission to date, offering the potential for developing compact mid-infrared sources based on this technology. The use of planar waveguides for very compact high-power sources is considered. Proximity coupling - the direct coupling of the diode-bar pump radiation is demonstrated for the first time and is used to realise a very compact and rugged laser system. Double-clad planar waveguide structures are utilised for spatial mode-control in the guided axis of the waveguide. To be compatible with planar fabrication techniques, and also due to the desire to retain a compact system, a double-clad design with large multimode core region is used. The theory of fundamental mode selection through confined doping for such structures is developed. This theory is applied to design the first double-clad planar waveguide and diffraction-limited performance in the guided axis is demonstrated from an Yb3+doped device.
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Gajum, Naima Ramadan. "Rare-earth doped (α'/β')-Sialon ceramics". Thesis, University of Warwick, 2001. http://wrap.warwick.ac.uk/3072/.

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The objectives of this research were to investigate the possibility of controlling the '/' phase ratio and morphology in Sialon ceramics. These objectives have been sought by the control of the starting composition, and by post sintering heat treatment. The main emphasis has been on the production of a series of ' and (+') Sialon ceramics with a minimum amount of the glass phase by the pressureless sintering technique and using ytterbium (Yb) as an ' stabilising element. The Yb additions were made via the oxide or the alumino-silicate presynthesised glass; the latter was found to improve the density. The XRD analysis of the as sintered materials revealed ' to be the dominant phase with minor contributions from ' sialon and/or or 12H AIN polytype. Additions of SiO2 or -Si3N4 were made to various materials to assess potential mechanisms for obtaining control over the microstructural development of '/' sialon materials. The addition of silica (SiO2) to sialon with high ' content in Yb system significantly improves the densification and increased the amount of ' phase. The incorporation of -Si3N4 as a seeding agent had a very small effect on the '/' phase ratio and the phase morphology. Further experiments were aimed at optimizing sinterability and sialon microstructure through the introduction of two ' stabilizing cations. Compositions were prepared that contained a combination of light and heavy rare-earth (Yb-Nd and Gd-Nd), and then pressureless sintered and compared with the single cation materials. Materials in the as sintered state were composed of a high ' sialon content with a minor amount of ' sialon and 12H AIN polytype indicating that the heavy rare-earth (which is the principal ' stabilizer) has a dominant effect although EDAX analysis confirmed the presence of both cations (light and heavy) within the ' structure. The research also compared, and developed an understanding of, the thermal stability of '-sialon using single Yb or mixed cations. The Yb single cation '/' materials exhibited excellent stability over a range of temperature (1200 - 1600°C) and for different periods of time up to 168 hrs. The heat treatments result in the crystallisation of the residual phase as a Yb garnet phase which formed at ˜1300°C. The mixed cation '/' materials showed some '-' transformation. The transformation was accompanied by dissolution of RA1O3 (normally crystallized with R=Nd,Gd) and crystallization of melilite.
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Binder, Michael. "Magnetization dynamics of rare earth doped magnetic films". Berlin Logos-Verl, 2006. http://deposit.d-nb.de/cgi-bin/dokserv?id=2917185&prov=M&dok_var=1&dok_ext=htm.

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Binder, Michael. "Magnetization dynamics of rare-earth doped magnetic films /". Berlin : Logos-Verl, 2007. http://deposit.d-nb.de/cgi-bin/dokserv?id=2917185&prov=M&dok_var=1&dok_ext=htm.

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Harrison, Michael Thomas. "Laser spectroscopy of rare earth doped inorganic glasses". Thesis, University of Oxford, 1996. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.308599.

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Libri sul tema "RARE EARTH DOPED"

1

F, Digonnet Michel J., a cura di. Rare-earth-doped fiber lasers and amplifiers. 2a ed. New York: Marcel Dekker, 2001.

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F, Digonnet Michel J., a cura di. Rare earth doped fiber lasers and amplifiers. New York: Marcel Dekker, 1993.

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3

Uekusa, Shinʼichirō. Studies on rare earth doped light emitting deviees. Kawasaki-shi: Meiji Daigaku Kagaku Gijutsu Kenkyūjo, 1995.

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4

L, Chubb Donald, e Lewis Research Center, a cura di. Rare earth doped high temperature ceramic selective emitters. [Cleveland, Ohio]: National Aeronautics and Space Administration, Lewis Research Center, 1999.

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5

O’Donnell, Kevin, e Volkmar Dierolf, a cura di. Rare Earth Doped III-Nitrides for Optoelectronic and Spintronic Applications. Dordrecht: Springer Netherlands, 2010. http://dx.doi.org/10.1007/978-90-481-2877-8.

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Rare earth doped III-nitrides for optoelectronic and spintronic applications. Dordrecht, the Netherlands: Springer, 2010.

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7

G, Potter B., Bruce Allan J e American Ceramic Society Meeting, a cura di. Synthesis and application of lanthanide-doped materials. Westerville, Ohio: American Ceramic Society, 1996.

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8

Rafiei Miandashti, Ali, Susil Baral, Eva Yazmin Santiago, Larousse Khosravi Khorashad, Alexander O. Govorov e Hugh H. Richardson. Photo-Thermal Spectroscopy with Plasmonic and Rare-Earth Doped (Nano)Materials. Singapore: Springer Singapore, 2019. http://dx.doi.org/10.1007/978-981-13-3591-4.

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Pisarska, Joanna. Lanthanide-doped lead borate glasses for optical applications. New York: Nova Science Publishers, 2010.

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10

Seppo, Honkanen, Jiang Shibin e Society of Photo-optical Instrumentation Engineers., a cura di. Rare-earth-doped devices II: 26-27 January 1998, San Jose, California. Bellingham, Wash: SPIE, 1998.

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Capitoli di libri sul tema "RARE EARTH DOPED"

1

Portnichenko, Paulo Y., Alistair S. Cameron e Dmytro S. Inosov. "Neutron-Scattering Studies of Spin Dynamics in Pure and Doped CeB6". In Rare-Earth Borides, 691–772. New York: Jenny Stanford Publishing, 2021. http://dx.doi.org/10.1201/9781003146483-9.

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Souza, Dulcina M., e Adilson L. Chinelatto. "Rare-Earth Doped Aluminous Electrical Porcelain". In Materials & Equipment/Whitewares: Ceramic Engineering and Science Proceedings, Volume 23, Issue 2, 45. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2008. http://dx.doi.org/10.1002/9780470294734.ch9.

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Payne, D. N. "Rare-Earth-Doped Fibres for Sensors". In Springer Proceedings in Physics, 534–36. Berlin, Heidelberg: Springer Berlin Heidelberg, 1989. http://dx.doi.org/10.1007/978-3-642-75088-5_79.

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4

Farmer, Thomas. "Rare Earth Doped Barium Titanate Glass". In Structural Studies of Liquids and Glasses Using Aerodynamic Levitation, 47–64. Cham: Springer International Publishing, 2014. http://dx.doi.org/10.1007/978-3-319-06575-5_4.

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Daudin, B. "Rare-Earth-Doped GaN Quantum Dot". In Topics in Applied Physics, 159–88. Dordrecht: Springer Netherlands, 2010. http://dx.doi.org/10.1007/978-90-481-2877-8_6.

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6

Jacquier, Bernard. "Rare Earth-Doped Fiber Lasers and Amplifiers". In Wide-Gap Luminescent Materials: Theory and Applications, 303–65. Boston, MA: Springer US, 1997. http://dx.doi.org/10.1007/978-1-4615-4100-4_6.

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7

Chen, Xuesheng. "Rare Earth Ion Doped Ceramic Laser Materials". In Frontiers of Optical Spectroscopy, 721–31. Dordrecht: Springer Netherlands, 2005. http://dx.doi.org/10.1007/1-4020-2751-6_24.

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Khong, Y. L., e S. Radhakrishna. "Materials for Laser Spectroscopy: Rare earth doped alkaline earth fluorides". In Solid State Materials, 207–20. Berlin, Heidelberg: Springer Berlin Heidelberg, 1991. http://dx.doi.org/10.1007/978-3-662-09935-3_14.

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9

Sohler, Wolfgang. "Rare Earth Doped LiNbO3 Waveguide Amplifiers and Lasers". In Waveguide Optoelectronics, 361–94. Dordrecht: Springer Netherlands, 1992. http://dx.doi.org/10.1007/978-94-011-1834-7_14.

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Dousti, M. Reza, e Raja J. Amjad. "Plasmon Assisted Luminescence in Rare Earth Doped Glasses". In Reviews in Plasmonics, 339–86. Cham: Springer International Publishing, 2016. http://dx.doi.org/10.1007/978-3-319-24606-2_14.

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Atti di convegni sul tema "RARE EARTH DOPED"

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Snitzer, Elias. "Rare-earth-doped fibers". In Integrated Photonics Research. Washington, D.C.: Optica Publishing Group, 1991. http://dx.doi.org/10.1364/ipr.1991.ma1.

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With the availability of compact high brightness laser diodes as pumps and low loss glasses as the hosts for rare earths, a significant new category of lasers has emerged. The small diameters for single mode fibers gives high thermal gradients that readily dissipate any heating so as to allow CW operating for outputs as high as several watts. The greatest attenuation has been given to erbium in silica operating at 1.53-1.55 μm as an optical amplifier for communications. It gives gains approaching 40 dB, gain coefficients greater titan 5 dB/mW for pumping at 0.98 or 1.47 nm, and saturation outputs of 18 dBm in fibers that are readily compatible with commercial fibers. In a double clad silica fiber, Nd at 1.06 μm can give an efficiency greater than 50% when pumped with a high output multiple stripe laser diode. In silica, laser emission has also been obtained from Pr, Sm, Ho, Tm and Yb. The lower energy phonon spectra of heavy metal fluorides has allowed for significant population in energy levels that are quenched in silicates, thereby giving additional laser transitions. Particularly striking in this regard are Ho and Tm which lase at shorter wave lengths than the pump by up-conversion through stepwise absorption of successive pump photons. Tm can lase at 455 and 480 nm when pumped with 640-690 nm radiation. Energy transfer between ions has been used for fluorescence sensitization, terminal state depletion and up-conversion. The configurations for laser oscillators, amplifiers, and super-luminescent sources will be discussed.
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2

Sanford, N. A., K. J. Malone, J. A. Aust e D. R. Larson. "Rare-earth-doped waveguide devices". In OSA Annual Meeting. Washington, D.C.: Optica Publishing Group, 1992. http://dx.doi.org/10.1364/oam.1992.tuj1.

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Rare-earth-doped integrated optic waveguide lasers have been demonstrated in glass, LiNbO3, and other host materials. This technology offers a variety of new components that include diode-pumped amplifiers and lasers. The planar geometry is particularly attractive because selective doping permits the integration of passive and active devices on the same substrate and it is also compatible with pumping by laser diodes. Ion exchanged channel waveguides have been demonstrated to lase near 1060 nm and 1320 nm in Nd-doped silicate and Nd-doped phosphate glass, respectively. Nd-doped waveguide lasers have also been fabricated by chemical vapor deposition; Er-doped waveguide lasers have been similarly fabricated. Y-branch splitters with gain at 1060 nm have been reported in Nd-doped silicate glass waveguides. Ion implantation has been used to form waveguides in Nd-doped YAG and Nd-doped GGG. Nd and Er-doped LiNbO3 waveguide lasers operating near 1060 nm and 1550 nm, respectively, have also been reported. Attempts have been made to demonstrate visible upconversion lasing in Er-doped LiNbO3 and LiTaO3 waveguides. We will review the status of this technology and also highlight some of the more promising applications.
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3

Li, M. J., W. J. Wang, S. Honkanen e S. I. Najafi. "Rare-earth-doped glass waveguides". In OSA Annual Meeting. Washington, D.C.: Optica Publishing Group, 1990. http://dx.doi.org/10.1364/oam.1990.mo6.

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Rare-earth-doped glass waveguides are suitable for the fabrication of stable and low-threshold lasers in both the visible and infrared regions.1 We have investigated potassium, silver, and cesium ion-exchange to produce neodymium- and erbium-doped glass channel waveguides. We studied two configurations. In the first configuration, the waveguides were produced in a commercially available rare-earth-doped substrate. In the second, a waveguide was made in an undoped glass. Then, it was spin coated with a rare-earth-doped phosphate layer. Channel waveguides with different dimensions were produced, and the propagation losses as well as the absorption and emission spectra of these waveguides were determined.
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4

MEARS, R. J., L. REEKIE, S. B. POOLE e D. N. PAYNE. "Rare-earth-doped fiber lasers". In Optical Fiber Communication Conference. Washington, D.C.: OSA, 1986. http://dx.doi.org/10.1364/ofc.1986.tul15.

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5

Josse, Emmanuelle, Jean-Emmanuel Broquin, Eric Lebrasseur, Gilles Fonteneau, Roger Rimet, Bernard Jacquier e Jacques Lucas. "Rare-earth-doped fluoride waveguides". In Photonics West '97, a cura di Seppo Honkanen. SPIE, 1997. http://dx.doi.org/10.1117/12.271146.

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6

Man, S. Q., H. W. Liu, Edwin Y. B. Pun e Po Sheun Chung. "Rare-earth-doped tellurite glasses". In 1998 International Conference on Applications of Photonic Technology, a cura di George A. Lampropoulos e Roger A. Lessard. SPIE, 1998. http://dx.doi.org/10.1117/12.328616.

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7

Hanna, David. "Rare Earth Doped Fiber Lasers". In Advanced Solid State Lasers. Washington, D.C.: OSA, 1987. http://dx.doi.org/10.1364/assl.1987.wb2.

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8

Miniscalco, William J. "Rare earth-doped glassed for fiber amplifiers". In OSA Annual Meeting. Washington, D.C.: Optica Publishing Group, 1991. http://dx.doi.org/10.1364/oam.1991.mt2.

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Work on rare earth-doped fiber lasers and amplifiers has focused on silica and fluorozirconate glasses primarily because fiber synthesis techniques are better developed for these compositions. Because pure silica is a poor host for rare earth ions the use of codopants is critical to controlling device properties. The addition of A12O3 significantly increases the solubility of rare earths, preventing clustering and its associated inefficiency. Al2O3-codoping also substantially increases the gain bandwith of silica Er3+-doped fiber amplifiers (EDFAs) by providing a broad emission spectrum more typical of a fluoride of fluorophosphate glass. For Er3+-doped silica, cross sections at 1500 nm are sensitive to codopants primarily through changes in the shape of the absorption and emission bands. While codopants can enhance the efficiency of EDFAs pumped at 800 nm, significant improvement can only be obtained by going to other glasses such as fluorophosphates. Composition has less influence on performance when exciting at 980 or 1480 nm, the latter pump band suffering from an inherent noise penalty of 1-2 dB. The strong 1060-nm transition of Nd3+ has a lower small-signal gain efficiency than ER3+, regardless of host. The weaker 1300-nm transition suffers additionally from excited state absorption, a process that is sensitive to composition.
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9

Gao, Renyuan, e A. F. Garito. "Rare earth doped polymer optical amplifiers". In Organic Thin Films. Washington, D.C.: OSA, 1999. http://dx.doi.org/10.1364/otf.1999.sua1.

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10

Mura, Emanuele, Gerardo C. Scarpignato, Joris Lousteau, Marco Rondinelli, Nadia G. Boetti e Daniel Milanese. "Rare-Earth Doped Phosphate Glass Fibers". In Advanced Solid State Lasers. Washington, D.C.: OSA, 2013. http://dx.doi.org/10.1364/assl.2013.am4a.17.

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Rapporti di organizzazioni sul tema "RARE EARTH DOPED"

1

Khitrova, Galina, e Hyatt M. Gibbs. Developing Rare-Earth Doped Semiconductor Light Sources. Fort Belvoir, VA: Defense Technical Information Center, giugno 1997. http://dx.doi.org/10.21236/ada329764.

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2

Gibbs, hyatt M., e Galina Khitrova. Improving VCSEL's & Rare-Earth-Doped Led's. Fort Belvoir, VA: Defense Technical Information Center, novembre 1998. http://dx.doi.org/10.21236/ada357987.

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3

Hommerich, Uwe. Spectroscopy and Device Performance of Rare Earth Doped III-Nitrides. Fort Belvoir, VA: Defense Technical Information Center, novembre 2002. http://dx.doi.org/10.21236/ada428892.

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4

Hommerich, Uwe. Optical Characterization of Rare Earth-doped Wide Band Gap Semiconductors. Fort Belvoir, VA: Defense Technical Information Center, agosto 1999. http://dx.doi.org/10.21236/ada369833.

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5

Garter, M., R. Birkhahn, A. J. Steckl e J. Scofield. Visible and Infrared Rare-Earth Activated Electroluminescence from Erbium Doped GaN. Fort Belvoir, VA: Defense Technical Information Center, gennaio 1999. http://dx.doi.org/10.21236/ada457728.

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6

Hehlen, Markus Peter. Advancing radiation balanced lasers (RBLs) in rare-earth (RE)-doped solids. Office of Scientific and Technical Information (OSTI), novembre 2016. http://dx.doi.org/10.2172/1334096.

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7

Le Nguyen, An-Dien. Polarization dependence of two-photon transition intensities in rare-earth doped crystals. Office of Scientific and Technical Information (OSTI), maggio 1996. http://dx.doi.org/10.2172/269043.

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8

Ashby, C. I. H., C. T. Sullivan e G. A. Vawter. Monolithically integrated active waveguides and lasers using rare-earth doped spin-on glass. Office of Scientific and Technical Information (OSTI), settembre 1996. http://dx.doi.org/10.2172/399670.

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9

Nostrand, M. New Mid-IR Lasers Based on Rare-Earth-Doped Sulfide and Chloride Materials. Office of Scientific and Technical Information (OSTI), settembre 2000. http://dx.doi.org/10.2172/15013357.

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10

SPIRE CORP BEDFORD MA. Rare Earth-Doped Porous Si Infrared LEDs for High-Speed Fiber-Optic Communications. Fort Belvoir, VA: Defense Technical Information Center, febbraio 1998. http://dx.doi.org/10.21236/ada338825.

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