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https://www.readbyqxmd.com/read/29333582/outpatient-erbium-yag-2940%C3%A2-nm-laser-treatment-for-snoring-a-prospective-study-on-40-patients
#1
Isabelle Fini Storchi, Steven Parker, Francesca Bovis, Stefano Benedicenti, Andrea Amaroli
Snoring is a sleep phenomenon due to the partial upper airway obstruction during sleep which causes vibration of the tissues of the rhino-oro-hypopharynx and less frequently the larynx. This study evaluated the use and effectiveness of the erbium:YAG 2940-nm laser as an adjunctive in providing treatment for patients suffering from chronic snoring-related sleep disorders. A prospective study of 40 consecutive patients with snoring and sleep disorders was performed, assessing data before and after three Er:YAG laser treatment sessions...
January 15, 2018: Lasers in Medical Science
https://www.readbyqxmd.com/read/29328276/femto-nano-second-switchable-passively-mode-locked-fiber-laser-with-analytic-modeling-by-the-cubic-quintic-ginzburg-landau-equation
#2
Wen-Hsuan Kuan, Li-Ting Kao, Jing-Yun Wang, Kuei-Huei Lin
We report a passively mode-locked erbium-doped fiber laser with pulse widths switchable from 473 fs to 76.8 ns, where the fundamental mode-locking, noise-like pulse, nanosecond mode-locking, and dual-width mode-locking (DML) are obtained by adjusting a polarization controller. Co-existence of femto- and nano-second pulses in DML is attributed to the gain balancing. Analytic modeling of the fiber laser with the cubic-quintic Ginzburg-Landau equation is presented, in which the pulse widths are calculated as functions of dispersion, self-phase modulation (SPM), cubic saturable absorption (SA), and quintic SA...
January 15, 2018: Optics Letters
https://www.readbyqxmd.com/read/29328273/optothermal-control-of-gains-in-erbium-doped-whispering-gallery-microresonators
#3
Xiao-Fei Liu, Tie-Jun Wang, Chuan Wang
Erbium-doped whispering-gallery-mode (WGM) microcavities have great potential in many important applications, such as the precision detection and the micro/nano laser. However, they are sensitive to the fluctuations from the pump laser and the environment. Here we demonstrate the precise controlling of transmission spectra and optical gains using optothermal scanning methods in erbium-doped WGM microcavities. The transmission spectrum of the probe signal exhibits the transition between asymmetric Fano-like resonance and the Lorentz peak (or dip) through tuning the input frequency and the scanning speed of the pump laser...
January 15, 2018: Optics Letters
https://www.readbyqxmd.com/read/29328242/efficient-diode-pumped-er-klu-wo4-2-laser-at-%C3%A2-1-61%C3%A2-%C3%A2-%C3%AE-m
#4
Josep Maria Serres, Pavel Loiko, Venkatesan Jambunathan, Xavier Mateos, Vladimir Vitkin, Antonio Lucianetti, Tomas Mocek, Magdalena Aguiló, Francesc Díaz, Uwe Griebner, Valentin Petrov
We report on an efficient diode-pumped continuous-wave erbium-doped monoclinic double tungstate laser. It is based on a 1 at. % Er3+:KLu(WO4)2 (Er:KLuW) crystal cut along the Ng optical indicatrix axis. The Er:KLuW microchip laser, diode pumped at 0.98 μm, generates 268 mW at 1.610 μm with a slope efficiency of 30%. The output is linearly polarized (E||Nm), and the laser beam is nearly diffraction limited (Mp,m2<1.1). Spectroscopic properties of Er3+ in KLuW are also presented. The stimulated-emission cross-section σSE is 0...
January 15, 2018: Optics Letters
https://www.readbyqxmd.com/read/29328186/single-crystal-er3-%C3%A2-%C3%A2-yag-fibers-with-tailored-refractive-index-profiles
#5
L Cheng, T Chick, J Chapman, E F C Dreyer, C D Nie, S Bera, J A Harrington, S C Rand
Erbium-doped yttrium aluminum garnet (Er3+:YAG) rods were inserted inside undoped tubes and grown into single-crystal fibers of a diameter of 300 μm using the laser-heated pedestal growth technique. Growth at various rates resulted in radially graded distributions of Er3+ dopant ions, as observed using laser-induced fluorescence imaging. Profiles of the refractive index were measured using cross-sectional reflectometry in a microscope. Dopant distributions and the corresponding index profiles were compared with thermal diffusion theory to determine the inter-diffusion coefficient of Y3+ and Er3+ ions at 2000°C, yielding an estimated value of D=(9...
January 10, 2018: Applied Optics
https://www.readbyqxmd.com/read/29328173/random-fiber-laser-based-on-artificially-controlled-backscattering-fibers
#6
Xiaoliang Wang, Daru Chen, Haitao Li, Lijuan She, Qiong Wu
The random fiber laser (RFL), which is a milestone in laser physics and nonlinear optics, has attracted considerable attention recently. Most previously reported RFLs are based on distributed feedback of Rayleigh scattering amplified through the stimulated Raman-Brillouin scattering effect in single-mode fibers, which require long-distance (tens of kilometers) single-mode fibers and high threshold, up to watt level, due to the extremely small Rayleigh scattering coefficient of the fiber. We proposed and demonstrated a half-open-cavity RFL based on a segment of an artificially controlled backscattering single-mode fiber with a length of 210 m, 310 m, or 390 m...
January 10, 2018: Applied Optics
https://www.readbyqxmd.com/read/29305571/laser-application-to-the-root-surface-increases-the-bonding-strength-of-surface-treated-prefabricated-glass-fiber-posts-in-teeth-with-excessive-substance-loss
#7
Zuhal Gorus, Ayse Mese, Berivan Dundar Yilmaz, Ozkan Adiguzel
BACKGROUND This study examined the effect of roughening of the root surface using an erbium-doped yttrium aluminum garnet (Er: YAG) laser on the binding strength of teeth undergoing root canal treatment. MATERIAL AND METHODS Ninety single-rooted teeth were used and assigned randomly to 9 groups (n=10 each). Root canals were prepared using the FlexMaster rotary system. An Er: YAG laser was applied to the root canals in Group 1, with no surface treatment of the glass-fiber post. In Group 2, aluminum oxide particles were applied...
January 6, 2018: Medical Science Monitor: International Medical Journal of Experimental and Clinical Research
https://www.readbyqxmd.com/read/29296111/effect-of-surface-treatment-on-enamel-cracks-after-orthodontic-bracket-debonding-er-cr-ysgg-laser-etching-versus-acid-etching
#8
Hassanali Ghaffari, Amirhossein Mirhashemi, Tahereh Baherimoghadam, Amir Azmi, Reza Rasooli
Objectives: This study sought to compare enamel cracks after orthodontic bracket debonding in the surfaces prepared with erbium, chromium: yttrium-scandium-galliumgarnet (Er,Cr:YSGG) laser and the conventional acid-etching technique. Materials and Methods: This in-vitro experimental study was conducted on 60 sound human premolars extracted for orthodontic purposes. The teeth were randomly divided into two groups (n=30). The teeth in group A were etched with 37% phosphoric acid gel, while the teeth in group B were subjected to Er,Cr:YSGG laser irradiation (gold handpiece, MZ8 tip, 50Hz, 4...
September 2017: Journal of Dentistry of Tehran University of Medical Sciences
https://www.readbyqxmd.com/read/29289201/note-micro-channel-array-crucible-for-isotope-resolved-laser-spectroscopy-of-high-temperature-atomic-beams
#9
Vyacheslav Lebedev, Joshua H Bartlett, Alexander Malyzhenkov, Alonso Castro
We present a novel compact design for a multichannel atomic oven which generates collimated beams of refractory atoms for fieldable laser spectroscopy. Using this resistively heated crucible, we demonstrate spectroscopy of an erbium sample at 1300 °C with improved isotopic resolution with respect to a single-channel design. In addition, our oven has a high thermal efficiency. By minimizing the surface area of the crucible, we achieve 2000 °C at 140 W of applied electrical power. As a result, the design does not require any active cooling and is compact enough to allow for its incorporation into fieldable instruments...
December 2017: Review of Scientific Instruments
https://www.readbyqxmd.com/read/29283687/recall-erythema-phenomenon-following-er-yag-laser-treatment-two-case-studies-and-literature-review
#10
Margit L W Juhász, Melissa Kanchanapoomi Levin, Ellen S Marmur
Recall erythema is a phenomenon occurring when an area of epidermis treated with laser is later exposed to a trigger, most often sunlight or hot water, causing erythema in the zone of laser treatment after post-treatment erythema has already resolved. Radiation recall dermatitis is a more specific subtype of recall erythema in which an area treated with radiation is subjected to another exposure causing erythema in the area of previous radiation. Cases of recall dermatitis after laser treatment are extremely rare and have only been reported with diode neodymium-doped yttrium aluminum garnet lasers...
December 28, 2017: Journal of Cosmetic and Laser Therapy: Official Publication of the European Society for Laser Dermatology
https://www.readbyqxmd.com/read/29282849/laser-assisted-removal-of-all-ceramic-fixed-dental-prostheses-a-comprehensive-review
#11
REVIEW
Sergio Varela Kellesarian, Vanessa Ros Malignaggi, Khaled M Aldosary, Fawad Javed
OBJECTIVE: The aim of this comprehensive review was to assess the effectiveness of erbium lasers in the removal of all ceramic fixed dental prostheses (FDPs). OVERVIEW: Indexed databases were searched without language or time restriction up to and including December 2017 using different combinations of the following keywords: "lasers"; "phototherapy"; "crowns"; "prostheses and implants"; "inlays"; "ceramics"; "dental porcelain"; "zirconium"; "removal"; "debonding"; "fixed dental prostheses"; "veneers"; "laminates"; and "fixed bridge...
December 28, 2017: Journal of Esthetic and Restorative Dentistry
https://www.readbyqxmd.com/read/29241926/effect-of-non-ablative-laser-treatment-on-overactive-bladder-symptoms-urinary-incontinence-and-sexual-function-in-women-with-urodynamic-stress-incontinence
#12
Yi-Hao Lin, Wu-Chiao Hsieh, Lulu Huang, Ching-Chung Liang
OBJECTIVE: To investigate the effects of non-ablative laser treatment on overactive bladder (OAB) syndromes, stress urinary incontinence and sexual function in women with urodynamic stress incontinence (USI). MATERIALS AND METHODS: Between April 2015 and June 2015, consecutive patients with USI with OAB syndromes underwent two sessions of Erbium:YAG laser treatment in a tertiary hospital. Patients received validated urological questionnaires, urodynamic studies, 1-h pad test and measurement of vaginal pressure before, one and three months after laser treatment...
December 2017: Taiwanese Journal of Obstetrics & Gynecology
https://www.readbyqxmd.com/read/29240189/intensity-noise-coupling-in-soliton-fiber-oscillators
#13
Chenchen Wan, Thomas R Schibli, Peng Li, Carlo Bevilacqua, Axel Ruehl, Ingmar Hartl
We present an experimental and numerical study on the spectrally resolved pump-to-output intensity noise coupling in soliton fiber oscillators. In our study, we observe a strong pump noise coupling to the Kelly sidebands, while the coupling to the soliton pulse is damped. This behavior is observed in erbium-doped as well as holmium-doped fiber oscillators and confirmed by numerical modeling. It can be seen as a general feature of laser oscillators in which soliton pulse formation is dominant. We show that spectral blocking of the Kelly sidebands outside the laser cavity can improve the intensity noise performance of the laser dramatically...
December 15, 2017: Optics Letters
https://www.readbyqxmd.com/read/29240177/photo-bleaching-mechanism-of-the-bac-si-in-bismuth-erbium-co-doped-optical-fibers
#14
Mingjie Ding, Jie Fang, Yanhua Luo, Wenyu Wang, Gang-Ding Peng
Photo-bleaching of the silica-related bismuth active center (BAC-Si) in bismuth/erbium co-doped optical fibers is investigated. By analyzing dynamic spectral characteristics of BAC-Si, the photo-bleaching of the BAC-Si is found to be linked to the escape of an excited electron from the bismuth site in the BAC-Si. This mechanism of BAC-Si bleaching linked to an escaping excited electron is further confirmed with both photo-bleaching experiments by different laser pump wavelengths and a potential energy model describing the loss of an excited electron...
December 15, 2017: Optics Letters
https://www.readbyqxmd.com/read/29240120/1-7%C3%A2-%C3%A2-%C3%AE-m-band-narrow-linewidth-tunable-raman-fiber-lasers-pumped-by-spectrum-sliced-amplified-spontaneous-emission
#15
Peng Zhang, Di Wu, Quanli Du, Xiaoyan Li, Kexuan Han, Lizhong Zhang, Tianshu Wang, Huilin Jiang
A 1.7 μm band tunable narrow-linewidth Raman fiber laser based on spectrally sliced amplified spontaneous emission (SS-ASE) and multiple filter structures is proposed and experimentally demonstrated. In this scheme, an SS-ASE source is employed as a pump source in order to avoid stimulated Brillouin scattering. The ring configuration includes a 500 m long high nonlinear optical fiber and a 10 km long dispersion shifted fiber as the gain medium. A segment of un-pumped polarization-maintaining erbium-doped fiber is used to modify the shape of the spectrum...
December 10, 2017: Applied Optics
https://www.readbyqxmd.com/read/29216107/fabrication-of-ultra-high-numerical-aperture-geo2-doped-fiber-and-its-use-for-broadband-supercontinuum-generation
#16
P Harshavardhan Reddy, A V Kir'yanov, Anirban Dhar, Shyamal Das, Debjit Dutta, Mrinmay Pal, Y O Barmenkov, J A Minguella-Gallardo, Shyamal Kumar Bhadra, Mukul Chandra Paul
We report the fabrication, characterization, and application (broadband supercontinuum [SC] generation) of ultra-high numerical-aperture heavily (50 mol. %) GeO2-doped optical fiber, obtained through a modified chemical vapor deposition process and rod-in-tube method. The formation of Ge-related diamagnetic defect centers, such as germanium oxygen defect centers (GeODC) with nonbridging lone electron pairs, confirmed by x-ray photoelectron spectroscopy and optical absorption studies, inducing hypolarizable local dipoles, may be responsible in boosting the nonlinear effects and enhancing stimulated Raman scattering at pumping with high-power pulses, culminating in generation of broadband SC generation...
November 20, 2017: Applied Optics
https://www.readbyqxmd.com/read/29216068/16%C3%A2-%C3%A2-gbps-random-bit-generation-using-chaos-in-near-symmetric-erbium-doped-fiber-ring-laser
#17
Akash Pandey, Ankit Sharma, Pradeep Kumar Krishnamurthy
We demonstrate a bias-free random bit generator at 16 Gbps using chaos in a near-symmetric erbium-doped fiber (EDF) ring laser. The laser consists of two EDFs, each pumped at 980 nm, two intracavity filters of central wavelength 1549.30 nm, and two 90:10 output couplers. The presence of chaos at the laser output is demonstrated by computing the largest Lyapunov exponent for different embedding dimensions. The laser outputs are photodetected and subtracted to generate an electrical difference signal, which is then sampled at 2 GSa/s and postprocessed to extract random bits at 16 Gbps...
December 1, 2017: Applied Optics
https://www.readbyqxmd.com/read/29197434/erbium-laser-technology-vs-traditional-drilling-for-caries-removal-a-systematic-review-with-meta-analysis
#18
REVIEW
Siying Tao, Lan Li, He Yuan, Sibei Tao, Yiming Cheng, Libang He, Jiyao Li
OBJECTIVE: The study aimed to assess the efficacy of erbium laser technology compared with traditional drilling for caries removal. METHODS: A systematic search was conducted through Medline via PubMed, Embase, Cochrane databases, CNKI till December 2016. Randomised controlled trials, quasi-randomized controlled trials, or controlled clinical trials with data comparing the efficacy of erbium laser technology versus traditional drilling for caries removal were included...
December 2017: Journal of Evidence-based Dental Practice
https://www.readbyqxmd.com/read/29192632/effect-of-different-modes-of-erbium-yttrium-aluminum-garnet-laser-on-shear-bond-strength-to-dentin
#19
E Kucukyilmaz, M S Botsali, E Korkut, Y Sener, T Sari
OBJECTIVES: The aim of this study was to evaluate the effect of different surface treatments on the shear bond strength (SBS) of resin composites to dentin using total etch dentin bonding adhesives. MATERIALS AND METHODS: Sixty extracted human molars were flattened to obtain dentin surfaces. The samples were divided into three groups (n = 20): Group I: 37% phosphoric acid + optibond FL + resin composite; Group II: Erbium:yttrium aluminum garnet (Er:YAG) laser (medium short pulse [MSP] mode, 120 mJ/10 Hz) + optibond FL + resin composite; Group III: Er:YAG laser (quantum square pulse [QSP] mode, 120 mJ/10 Hz) + optibond FL + resin composite...
October 2017: Nigerian Journal of Clinical Practice
https://www.readbyqxmd.com/read/29182527/all-fiber-laser-curvature-sensor-using-an-in-fiber-modal-interferometer-based-on-a-double-clad-fiber-and-a-multimode-fiber-structure
#20
Ricardo I Álvarez-Tamayo, Manuel Durán-Sánchez, Patricia Prieto-Cortés, Guillermo Salceda-Delgado, Arturo A Castillo-Guzmán, Romeo Selvas-Aguilar, Baldemar Ibarra-Escamilla, Evgeny A Kuzin
An all-fiber curvature laser sensor by using a novel modal interference in-fiber structure is proposed and experimentally demonstrated. The in-fiber device, fabricated by fusion splicing of multimode fiber and double-clad fiber segments, is used as wavelength filter as well as the sensing element. By including a multimode fiber in an ordinary modal interference structure based on a double-clad fiber, the fringe visibility of the filter transmission spectrum is significantly increased. By using the modal interferometer as a curvature sensitive wavelength filter within a ring cavity erbium-doped fiber laser, the spectral quality factor Q is considerably increased...
November 28, 2017: Sensors
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