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https://www.readbyqxmd.com/read/28537743/er-3-photoluminescence-in-er2-c82-and-er2c2-c82-metallofullerenes-elucidated-by-density-functional-theory
#1
Jian Wang, Yuan-Yuan Zhao, Po-Heng Lee, Stephan Irle
Metallofullerenes with two erbium atoms encapsulated in IPR C82 cage isomers Cs-6 (I), C2v-9 (II), and C3v-8 (III) were investigated using density functional theory. The calculations suggest that erbium atoms assume a trivalent state with Er (4f(11)) valence electronic configuration in Er2@C82 and Er2C2@C82, where two electrons (6s(2)) per Er atom are transferred to the cage carrying four negative charges (C82(4-)), while the third electron is promoted from the 4f to the 5d shell, becoming involved in covalent bonding to near atoms...
May 24, 2017: Inorganic Chemistry
https://www.readbyqxmd.com/read/28527844/evaluation-of-various-pretreatments-to-fiber-post-on-the-push-out-bond-strength-of-root-canal-dentin
#2
Ömer Kırmalı, Özlem Üstün, Alper Kapdan, Alper Kuştarcı
INTRODUCTION: The aim of this in vitro study was to compare the effect of different pretreatments (fiber post) with the laser-activated irrigation (LAI) technique (for removal of the smear layer) on root canal dentin in terms of push-out bond strength (PBS) in a fiber post. METHODS: Fifty freshly extracted mandibular single-rooted premolars were prepared, and LAI was applied to all roots (17% EDTA was 5 mL for 120 seconds with an erbium, chromium:yttrium-scandium-gallium-garnet laser [0...
May 17, 2017: Journal of Endodontics
https://www.readbyqxmd.com/read/28518180/the-effects-of-laser-with-different-parameters-and-crosshatching-on-fibroblast-adhesion-and-proliferation-to-implant-surfaces
#3
Hakki Çelebi, Pembegül Uyar Arpacı, Ilhami Çelik, Serhan Akman
PURPOSE: To compare the adhesion and proliferation effect of HGF-1 cells on pure titanium disks when the surfaces are unprocessed (machined surfaces after slicing) or modified with a laser. MATERIALS AND METHODS: Twenty-eight titanium disks were divided into four groups. Three surface topographies were created using an erbium fiber laser: group 1 (unidirectional application [no crosshatch]), group 2 (crosshatching in two directions), and group 3 (crosshatching in three directions)...
May 18, 2017: International Journal of Oral & Maxillofacial Implants
https://www.readbyqxmd.com/read/28514344/-erbium-laser-application-for-oral-surgery-in-patients-with-platelet-hemostatic-disorders
#4
E V Makarova, S V Tarasenko, A L Melikyan, A V Ponomarenko
Hemostatic disorders are typically associated with prolonged bleeding after or during surgical procedures. The aim of the study was to increase the efficiency of oral surgery in these patients using erbium laser. Selected 46 patients receiving oral surgery were randomly divided in 2 groups: 43 patients with thrombocytopenia, trombocytemia and other platelet disorders treated with erbium laser and a control group of 43 patients without concomitant pathology determined for conventional surgical treatment. No postoperative bleeding was seen in group 1...
2017: Stomatologii︠a︡
https://www.readbyqxmd.com/read/28513512/effects-of-laser-etching-on-shear-bond-strengths-of-brackets-bonded-to-fluorosed-enamel
#5
R Nalcaci, B Temel, S Çokakoğlu, H Türkkahraman, S Üsümez
AIM: To evaluate the effects of laser etching on the shear bond strengths (SBS) and failure modes of brackets bonded to fluorosed enamel. MATERIALS AND METHODS: This in vitro study included 34 fluorosed and 34 nonfluorosed teeth. Teeth were divided into four subgroups according to the etching procedure: Group (A) normal enamel etched with 37% phosphoric acid for 15 s, Group (B) nonfluorosed enamel etched with erbium:yttrium aluminum garnet (Er: YAG) laser for 15 s, Group (C) fluorosed enamel etched with 37% phosphoric acid for 30 s, Group (D) fluorosed enamel etched with Er: YAG laser for 30 s...
May 2017: Nigerian Journal of Clinical Practice
https://www.readbyqxmd.com/read/28512669/combined-fractional-treatment-of-acne-scars-involving-non-ablative-1-550-nm-erbium-glass-laser-and-micro-needling-radiofrequency-a-16-week-prospective-randomized-split-face-study
#6
Hyuck Hoon Kwon, Hae Young Park, Sun Chul Choi, Youin Bae, Chanhee Kang, Jae Yoon Jung, Gyeong-Hun Park
An optimized therapeutic regimen involving a non-ablative fractionated laser or radiofrequency therapy for acne scars has not yet been established. To evaluate whether the combination of a non-ablative fractional laser (NAF) and fractional micro-needling radiofrequency (FMR) has clinical advantages for the treatment of atrophic acne scars compared with NAF alone, a 16-week prospective, randomized split-face study was performed. Each facial side of a patient was treated with 3 sessions of either NAF with FMR or NAF alone, with a 4-week interval between each session...
May 17, 2017: Acta Dermato-venereologica
https://www.readbyqxmd.com/read/28487927/ferromagnetic-coupling-in-a-chloride-bridged-erbium-single-molecule-magnet
#7
J D Hilgar, B S Flores, J D Rinehart
We present the first ferromagnetically-coupled Er(3+) complex with linked, high-anisotropy Er-COT (COT(2-) = cyclooctatetraene dianion) subunits. The dinuclear complex, [Er(μ2-Cl)(COT)(THF)]2, demonstrates single-molecule magnetism with a single, zero-field magnetization relaxation barrier of Ueff = 113 cm(-1). This system offers evidence that anisotropy can be preserved in the presence of ferromagnetic linking of the Er-COT subunits, providing a rational means to build strong molecular magnets of tunable dimensionality...
May 10, 2017: Chemical Communications: Chem Comm
https://www.readbyqxmd.com/read/28470867/confining-excitation-energy-in-er-3-sensitized-upconversion-nanocrystals-through-tm-3-mediated-transient-energy-trapping
#8
Qiushui Chen, Xiaojie Xie, Bolong Huang, Liangliang Liang, Sanyang Han, Zhigao Yi, Yu Wang, Ying Li, Dianyuan Fan, Ling Huang, Xiaogang Liu
A new class of lanthanide-doped upconversion nanoparticles are presented that are without Yb(3+) or Nd(3+) sensitizers in the host lattice. In erbium-enriched core-shell NaErF4 :Tm (0.5 mol %)@NaYF4 nanoparticles, a high degree of energy migration between Er(3+) ions occurs to suppress the effect of concentration quenching upon surface coating. Unlike the conventional Yb(3+) -Er(3+) system, the Er(3+) ion can serve as both the sensitizer and activator to enable an effective upconversion process. Importantly, an appropriate doping of Tm(3+) has been demonstrated to further enhance upconversion luminescence through energy trapping...
May 4, 2017: Angewandte Chemie
https://www.readbyqxmd.com/read/28468427/200-fs-mode-locked-erbium-doped-fiber-laser-by-using-mechanically-exfoliated-mos-sub-2-sub-saturable-absorber-onto-d-shaped-optical-fiber
#9
Eduardo J Aiub, David Steinberg, Eunézio A Thoroh de Souza, Lúcia A M Saito
For the first time, we demonstrated the fabrication of mechanically exfoliated molybdenum disulfide (MoS<sub>2</sub>) samples deposited onto a D-shaped optical fiber. The MoS<sub>2</sub> exfoliated flakes were deposited onto a stacked of 1.2 µm PVA (polyvinyl alcohol) and 300 nm PMMA (polymethyl methacrylate) layers and then transferred directly onto a side polished surface of D-shaped optical fiber with polishing length of 17 mm and no distance from the fiber core. The sample exhibited a high polarization performance as a polarizer with relative polarization extinction ratio of 97...
May 1, 2017: Optics Express
https://www.readbyqxmd.com/read/28468335/coherent-beam-combining-of-a-narrow-linewidth-long-pulse-er-sup-3-sup-doped-multicore-fiber-amplifier
#10
F Prevost, L Lombard, J Primot, L P Ramirez, L Bigot, G Bouwmans, M Hanna
Active phase locking of a multicore erbium-doped fiber amplifier is demonstrated for 180 ns narrow-linewidth pulses at 1545 nm. A spatial light modulator is used at the input of the amplifier to control the optical phase of 7 beams injected in the hexagonally-arranged cores, ensuring efficient combining through a SPGD algorithm. At the output, combining is performed using a diffractive optical element. This experiment establishes multicore amplifiers as a promising way to scale the energy of Brillouin-limited pulsed amplifiers for LIDAR applications...
May 1, 2017: Optics Express
https://www.readbyqxmd.com/read/28463280/comparative-assessment-of-erbium-fiber-ring-lasers-and-reflective-soa-linear-lasers-for-fiber-bragg-grating-dynamic-strain-sensing
#11
Heming Wei, Sridhar Krishnaswamy
Fiber Bragg grating (FBG) dynamic strain sensors using both an erbium-based fiber ring laser configuration and a reflective semiconductor optical amplifier (RSOA)-based linear laser configuration are investigated theoretically and experimentally. Fiber laser models are first presented to analyze the output characteristics of both fiber laser configurations when the FBG sensor is subjected to dynamic strains at high frequencies. Due to differences in the transition times of erbium and the semiconductor (InP/InGaAsP), erbium-doped fiber amplifier (EDFA)- and RSOA-based fiber lasers exhibit different responses and regimes of stability when the FBG is subjected to dynamic strains...
May 1, 2017: Applied Optics
https://www.readbyqxmd.com/read/28454157/wavelength-division-multiplexed-light-source-monolithically-integrated-on-a-silicon-photonics-platform
#12
P Purnawirman, Nanxi Li, E Salih Magden, Gurpreet Singh, Michele Moresco, Thomas N Adam, Gerard Leake, Douglas Coolbaugh, Jonathan D B Bradley, Michael R Watts
We demonstrate monolithic integration of a wavelength division multiplexed light source for silicon photonics by a cascade of erbium-doped aluminum oxide (Al<sub>2</sub>O<sub>3</sub>:Er<sup>3+</sup>) distributed feedback (DFB) lasers. Four DFB lasers with uniformly spaced emission wavelengths are cascaded in a series to simultaneously operate with no additional tuning required. A total output power of -10.9  dBm is obtained from the four DFBs with an average side mode suppression ratio of 38...
May 1, 2017: Optics Letters
https://www.readbyqxmd.com/read/28430226/stable-nanosecond-passively-q-switched-all-fiber-erbium-doped-laser-with-a-45%C3%A2-tilted-fiber-grating
#13
Tianxing Wang, Zhijun Yan, Chengbo Mou, Kaiming Zhou, Lin Zhang
Nanosecond passive Q-switching generation from an all-fiber erbium-doped laser with a UV inscribed 45° tilted fiber grating (TFG) is systematically demonstrated. The 45° TFG is employed as a polarizer together with two polarization controllers (PCs) to realize nonlinear polarization rotation (NPR). Because of the NPR effect, stable Q-switched pulses with an average output power of 17.5 mW, a single pulse energy of 72.7 nJ, a repetition rate of 241 kHz, a pulse width of 466 ns, and a signal to noise ratio (SNR) of 58...
April 20, 2017: Applied Optics
https://www.readbyqxmd.com/read/28424926/erratum-to-co2-erbium-yag-dye-laser-combination-an-effective-and-successful-treatment-for-angiofibromas-in-tuberous-sclerosis
#14
Paolo Fioramonti, Liliana De Santo, Martina Ruggieri, Sara Carella, Federico Lo Torto, Maria Giuseppina Onesti, Nicolò Scuderi
No abstract text is available yet for this article.
April 19, 2017: Aesthetic Plastic Surgery
https://www.readbyqxmd.com/read/28394240/effect-of-laser-activated-irrigations-on-smear-layer-removal-from-the-root-canal-wall
#15
Xiaoli Wang, Xiaogang Cheng, Baogang Liu, Xin Liu, Qing Yu, Wenxi He
OBJECTIVE: The purpose of this study was to evaluate the effect of laser-activated irrigations (LAI) by using the Erbium: Yttrium Aluminum Garnet (Er:YAG) laser and the Erbium Chromium: Yttrium Scandium Gallium Garnet (Er,Cr:YSGG) laser on removing smear layer (SL) from the root canal wall. BACKGROUND DATA: LAI has been proposed as an adjuvant to conventional protocols of endodontic treatment to enhance the disinfection, which is a promising protocol for SL removal...
April 5, 2017: Photomedicine and Laser Surgery
https://www.readbyqxmd.com/read/28392716/er-yag-pre-treatment-for-bonding-of-orthodontic-bracket-1-year-of-in-vitro-treatment
#16
Rudys Rodolfo de Jesus Tavarez, Gisele Lima Bezerra, Karla Janilee de Souza Penha, Carlos Rocha Gomes Torres, Leily Macedo Firoozmand
OBJECTIVE: The aim of this study was to evaluate in vitro bond strength of metal brackets bonded with: total etch, total etch with erbium: yttrium aluminum garnet laser (Er:YAG) and self-etching adhesive systems, submitted to thermal-mechanical cycling, simulating 1 year of orthodontic treatment. MATERIALS AND METHODS: For the study, 80 bovine incisors were randomly divided into 3 experimental groups (n=16 each): XT- acid etching + Transbond XT, XT/Er:YAG- Transbond XT associated with Er:YAG laser irradiation (λ=2...
2017: Clinical, Cosmetic and Investigational Dentistry
https://www.readbyqxmd.com/read/28381043/design-of-praseodymium-doped-chalcogenide-micro-disk-emitting-at-4-7-%C3%A2%C2%B5m
#17
Giuseppe Palma, Mario Christian Falconi, Florent Starecki, Virginie Nazabal, Julien Ari, Loic Bodiou, Joel Charrier, Yannick Dumeige, Emeline Baudet, Francesco Prudenzano
A compact amplifier based on chalcogenide Pr<sup>3+</sup>-doped micro-disk coupled to two ridge waveguides is designed and refined by means of a home-made computer code. The gain G ≈ 7.9 dB is simulated for a Pr<sup>3+</sup> concentration of 10 000 ppm, input signal power of -30 dBm at the wavelength 4.7 µm and input pump power of 50 mW at the wavelength 1.55 µm. In the laser behavior, i.e. without input signal, the maximum slope efficiency S = 8.1 × 10<sup>-4</sup> is obtained for an input pump power of 2 mW...
March 20, 2017: Optics Express
https://www.readbyqxmd.com/read/28381000/e-band-nd-sup-3-sup-amplifier-based-on-wavelength-selection-in-an-all-solid-micro-structured-fiber
#18
Jay W Dawson, Leily S Kiani, Paul H Pax, Graham S Allen, Derrek R Drachenberg, Victor V Khitrov, Diana Chen, Nick Schenkel, Matthew J Cook, Robert P Crist, Michael J Messerly
A Nd<sup>3+</sup> fiber amplifier with gain from 1376 nm to 1466 nm is demonstrated. This is enabled by a wavelength selective waveguide that suppresses amplified spontaneous emission between 850 nm and 1150 nm. It is shown that while excited state absorption (ESA) precludes net gain below 1375 nm with the exception of a small band from 1333 nm to 1350 nm, ESA diminishes steadily beyond 1375 nm allowing for the construction of an efficient fiber amplifier with a gain peak at 1400 nm and the potential for gain from 1375 nm to 1500 nm...
March 20, 2017: Optics Express
https://www.readbyqxmd.com/read/28380992/high-average-power-parametric-wavelength-conversion-at-3-31-3-48-m-in-mgo-ppln
#19
R T Murray, T H Runcorn, S Guha, J R Taylor
We present results of high average power mid-infrared (mid-IR) generation employing synchronized nanosecond pulsed ytterbium and erbium fiber amplifier systems using periodically poled lithium niobate. We generate greater than 6 W of mid-IR radiation tunable in wavelength between 3.31-3.48 μm, at power conversion efficiencies exceeding 75%, with near diffraction limited beam quality (M<sup>2</sup> = 1.4). Numerical modeling is used to verify the experimental results in differing pump depletion regimes...
March 20, 2017: Optics Express
https://www.readbyqxmd.com/read/28380916/simply-integrated-dual-comb-spectrometer-via-tunable-repetition-rates-and-avoiding-self-referencing
#20
Honglei Yang, Haoyun Wei, Kun Chen, Shengkang Zhang, Yan Li
Dual-comb system with simplified integration acts a crucial role in the next stage of field-deployable application. Here we demonstrate a home-made dual-comb spectrometer that meets this requirement based on optically stabilized erbium-fiber frequency combs. The simplified integration and operability are highlighted by the embedded large motion-span automatic optical delay line that resulted in 1.7 MHz of continuous repetition rate tuning range and avoid multiple fiber cutbacks. This relaxes the second similar frequency comb duplication, therefore simplifies dual-comb system integration...
April 3, 2017: Optics Express
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