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Nd Yag laser

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https://www.readbyqxmd.com/read/28081098/generation-of-terahertz-optical-beating-from-a-simultaneously-self-mode-locked-nd-yag-laser-at-1064-and-1123%C3%A2-%C3%A2-nm
#1
C L Sung, C Y Lee, C C Chang, H C Liang, Y F Chen
The reflectivity of the output coupler is designed to achieve the synchronously self-mode-locked operation at 1064 and 1123 nm in a diode-end-pumped Nd:YAG laser. Numerical analyses are performed to confirm that the designed output coupler can lead the emission lines to be predominant at 1064 and 1123 nm. Moreover, the crossover of the threshold pump powers for the 1064 and 1123 nm emission lines can be exploited to obtain the single central wavelength of 1064 nm or the single central wavelength of 1123 nm or, simultaneously, dual-central-wavelength self-mode-locked operation by finely adjusting the cavity alignment...
January 15, 2017: Optics Letters
https://www.readbyqxmd.com/read/28078503/efficacy-of-pulsed-nd-yag-laser-in-the-treatment-of-patients-with-knee-osteoarthritis-a-randomized-controlled-trial
#2
Mohamed Salaheldien Mohamed Alayat, Tarek Helmy Ahmed Aly, Aly Elsayed Mohamed Elsayed, Ammar Suliman Mohamed Fadil
The purpose of this study was to investigate the effects of pulsed Nd:YAG laser plus glucosamine/chondroitin sulfate (GCS) in patients with knee osteoarthritis (KOA) by examining changes in pain and knee function, as well as synovial thickness (ST) and femoral cartilage thickness (FCT). Sixty-seven male patients participated, with a mean (SD) age of 53.85 (4.39) years, weight of 84.01 (4.70) kg, height of 171.51 (3.96) cm, and BMI of 28.56 (1.22). Group 1 was treated with high-intensity laser therapy (HILT), GCS, and exercises (HILT + GCS + EX)...
January 11, 2017: Lasers in Medical Science
https://www.readbyqxmd.com/read/28070641/influence-of-temporary-nasal-occlusion-tno-on-epistaxis-frequency-in-patients-with-hereditary-hemorrhagic-telangiectasia-hht
#3
Kornelia E C Wirsching, Frank Haubner, Thomas S Kühnel
The objective of the study was to evaluate the influence of temporary nasal occlusion (tNO) with hypoallergenic tape on the frequency and severity of epistaxis in patients with hereditary hemorrhagic telangiectasia (HHT). This prospective observational study included 20 HHT patients who were undergoing Nd:YAG laser therapy at regular intervals. Over a 3-month period, laser therapy was supplemented by tNO with hypoallergenic tape for 5 h/day on average. On a 0-10 numeric rating scale, the patients reported significantly greater satisfaction in epistaxis terms after tNO treatment, with mean scores of 5 before and 7 after 3-month tNO (p = 0...
January 9, 2017: European Archives of Oto-rhino-laryngology
https://www.readbyqxmd.com/read/28066547/holographic-direct-pulsed-laser-writing-of-two-dimensional-nanostructures
#4
Bader AlQattan, Haider Butt, Aydin Sabouri, Ali K Yetisen, Rajib Ahmed, Nasim Mahmoodi
The development of accurate and rapid techniques to produce nanophotonic structures is essential in data storage, sensors, and spectroscopy. Existing bottom-up and top-down approaches to fabricate nanophotonic devices are high cost and time consuming, limiting their mass manufacturing and practical applications. Here, we demonstrate a strategy to rapidly create 25-40 nm thick 1/2D Au-Ti nanopatterns using holographic direct laser interference patterning (DLIP). Pulses of an Nd:YAG laser (1064 nm) in holographic Denisyuk reflection mode were used to create ablative interference fringes...
December 4, 2016: RSC Advances
https://www.readbyqxmd.com/read/28064220/gene-expression-analysis-of-cultured-rat-endothelial-cells-after-nd-yag-laser-irradiation-by-affymetrix-genechip-array
#5
Yoshiko Masuda, Satoshi Yokose, Hiroshi Sakagami
Endothelial cells and dental pulp cells enhance osteo-/odontogenic and angiogenic differentiation. In our previous study, rat pulp cells migrated to Nd:YAG laser-irradiated endothelial cells in an insert cell culture system. The purpose of this study was to examine the possible changes in the gene expression of cultured rat aortic endothelial cells after Nd:YAG laser irradiation using affymetrix GeneChip Array. Total RNA was extracted from the cells at 5 h after laser irradiation. Gene expressions were evaluated by DNA array chip...
January 2017: In Vivo
https://www.readbyqxmd.com/read/28061322/long-pulsed-1064-nm-nd-yag-laser-for-the-treatment-of-onychomycosis
#6
Domenico Piccolo, Dimitra Kostaki, Ester Del Duca, Giovanni Cannarozzo, Mario Sannino, Steven Nisticò
OBJECTIVE: The aim of this study is to evaluate the efficacy of long-pulsed 1064-nm Nd:YAG laser in penetrating tissue and targeting the fungal overgrowth in the nail plate. BACKGROUND: Onychomycosis is the most frequent nail disorder. Current treatments include oral and topical antifungal agents, photodynamic therapy, and surgical approaches such as mechanical, chemical, or surgical nail avulsion. Moreover, the use of lasers to treat nail diseases has been approved in the United States by the Food and Drug Administration (FDA)...
December 30, 2016: Photomedicine and Laser Surgery
https://www.readbyqxmd.com/read/28061317/diffuse-urticarial-reaction-associated-with-titanium-dioxide-following-laser-tattoo-removal-treatments
#7
Hal Bret Willardson, Todd T Kobayashi, Jason G Arnold, Chad M Hivnor, Casey D Bowen
IMPORTANCE: Local and generalized allergic reactions following laser tattoo removal have been documented, but are rare. To our knowledge, this is the fourth documented case of widespread urticarial eruptions following laser tattoo removal treatment. Unlike previously documented cases, this patient's reaction was found to be associated with titanium dioxide within the tattoo and her symptoms were recalcitrant to medical therapy. OBSERVATIONS: A 46-year-old female experienced diffuse urticarial plaques, erythema, and pruritis following multiple laser tattoo removal treatments with an Nd:YAG laser...
January 2, 2017: Photomedicine and Laser Surgery
https://www.readbyqxmd.com/read/28059341/high-speed-three-dimensional-tomographic-laser-induced-incandescence-imaging-of-soot-volume-fraction-in-turbulent-flames
#8
Terrence R Meyer, Benjamin R Halls, Naibo Jiang, Mikhail N Slipchenko, Sukesh Roy, James R Gord
High-speed, laser-based tomographic imaging of the three-dimensional time evolution of soot volume fraction in turbulent jet diffusion flames is demonstrated to be feasible at rates of 10 kHz or higher. The fundamental output of a burst-mode Nd:YAG laser with 1 J/pulse is utilized for volumetric impulsive heating of soot particles with a laser fluence of 0.1 J/cm<sup>2</sup>, enabling signal-to-noise ratios of ~100:1 in images of the resulting incandescence. The three-dimensional morphology of the soot distribution is captured with a spatial resolution of <1...
December 26, 2016: Optics Express
https://www.readbyqxmd.com/read/28059247/remote-raman-measurements-of-minerals-organics-and-inorganics-at-430%C3%A2-%C3%A2-m-range
#9
Tayro E Acosta-Maeda, Anupam K Misra, Lloyd G Muzangwa, Genesis Berlanga, Dalton Muchow, John Porter, Shiv K Sharma
Raman spectroscopy is a characterization technique that is able to analyze and detect water or water-bearing minerals, minerals, and organic materials that are of special interest for planetary science. Using a portable pulsed remote Raman system with a commercial 8 in. (203.2 mm) telescope, a frequency doubled Nd-YAG-pulsed laser, and a spectrometer equipped with an intensified CCD camera, we acquired good quality Raman spectra of various materials from a 430 m standoff distance during daylight with detection times of 1-10 s, in a realistic context in which both the exciting source and the detector are part of the same measurement system...
December 20, 2016: Applied Optics
https://www.readbyqxmd.com/read/28058161/posterior-capsular-opacification-in-preschool-and-school-age-patients-after-pediatric-cataract-surgery-without-posterior-capsulotomy
#10
Muhammed Batur, Adem Gül, Erbil Seven, Ertuğrul Can, Tekin Yaşar
OBJECTIVES: We aimed to evaluate the development of posterior capsular opacification (PCO) in preschool- and school-age children with cataract who underwent cataract surgery without posterior capsulotomy and anterior vitrectomy. MATERIALS AND METHODS: The records of 30 eyes of 21 patients who underwent pediatric cataract surgery and intraocular lens (IOL) implantation were retrospectively reviewed. Patients' age, PCO status and duration, need for neodymium-doped yttrium aluminium garnet (Nd:YAG) laser treatment based on coverage of visual axis, and follow-up period were recorded...
October 2016: Turkish Journal of Ophthalmology
https://www.readbyqxmd.com/read/28054221/nonlinear-interactions-of-zinc-phthalocyanine-graphene-quantum-dots-nanocomposites-investigation-of-effects-of-surface-functionalization-with-heteroatoms
#11
Owolabi M Bankole, Ojodomo J Achadu, Tebello Nyokong
This study reports the development of functional optical limiting materials composed of pristine graphene (GQDs), nitrogen-doped (NGQDs) and sulfur-nitrogen co-doped (SNGQDs) graphene quantum dots covalently linked to mono-amino substituted zinc phthalocyanine (Pc). Open aperture Z-scan technique was employed to monitor the behaviour of the conjugates under tightly focussed Gaussian laser beam using a mode-locked Nd:YAG laser delivering 10 nanosecond (FWHM) pulses at 532 nm wavelength. Nonlinear effect due to reverse saturable absorption was the predominant mechanism; and was attributed to the moderately enhanced triplet population...
January 4, 2017: Journal of Fluorescence
https://www.readbyqxmd.com/read/28040919/evaluation-of-a-flat-field-grazing-incidence-spectrometer-for-highly-charged-ion-plasma-emission-in-soft-x-ray-spectral-region-from-1-to-10-nm
#12
Thanh Hung Dinh, Yoshiki Kondo, Toshiki Tamura, Yuichi Ono, Hiroyuki Hara, Hiroki Oikawa, Yoichi Yamamoto, Masahiko Ishino, Masaharu Nishikino, Tetsuya Makimura, Padraig Dunne, Gerry O'Sullivan, Shigeru Ohta, Ken Kitano, Takeo Ejima, Tadashi Hatano, Takeshi Higashiguchi
A flat-field grazing incidence spectrometer operating on the spectral region from 1 to 10 nm was built for research on physics of high temperature and high energy density plasmas. It consists of a flat-field grating with 2400 lines/mm as a dispersing element and an x-ray charged coupled device (CCD) camera as the detector. The diffraction efficiency of the grating and the sensitivity of the CCD camera were directly measured by use of synchrotron radiation at the BL-11D beamline of the Photon Factory (PF). The influence of contamination to the spectrometer also was characterized...
December 2016: Review of Scientific Instruments
https://www.readbyqxmd.com/read/28035845/efficacy-of-nd-yag-laser-iridotomies-in-primary-angle-closure-diseases-superior-peripheral-iridotomy-versus-inferior-peripheral-iridotomy
#13
Mostafa Ahmadi, Zahra Naderi Beni, Afsaneh Naderi Beni, Farzan Kianersi
PURPOSE: To evaluate the efficacy and safety of superior peripheral iridotomy versus inferior peripheral iridotomy in the treatment of primary angle closure glaucoma (PACG) in phakic patients. METHODS: In this randomized, prospective, paired-eye comparative study, patients with primary angle closure or primary angle-closure suspects were recruited and randomized to receive (NdYAG) laser peripheral iridotomy (LPI) superiorly in one eye and inferiorly in the other eye...
December 30, 2016: Current Medical Research and Opinion
https://www.readbyqxmd.com/read/28009938/structure-and-optical-properties-of-carbon-nanoparticles-generated-by-laser-treatment-of-graphite-in-liquid
#14
Natalie Tarasenka, Aleksandr Stupak, Nikolai Tarasenko, Davide Mariotti, Supriya Chakrabarti
In this paper we report one-step synthesis of luminescent carbon nanoparticles (NPs) via laser irradiation of a graphite target in solvent (H2O, ethanol, 0.008M aqueous diethylenetriaminepentaacetic acid (DTPA) solution). This is a simple approach for the fabrication of carbon dots with tunable photoluminescence (PL) that differs from the other preparation methods as no post-passivation step is required. The unfocused beam of the second harmonic (wavelength 532 nm) of the Nd:YAG laser was used in our experiments...
December 23, 2016: Chemphyschem: a European Journal of Chemical Physics and Physical Chemistry
https://www.readbyqxmd.com/read/28004093/direct-laser-synthesis-of-ag-nanoparticles-from-ammonia-alcoholic-solutions-of-agno3
#15
Mikhail Mikhailov Dmitrievich, Ilya Kolesnikov Evgen Evich, Alina Manshina Anvyarovna
Ag nanoparticles were synthesized as a result of irradiation of ammonia-alcoholic solution of AgNO3 with focused beam of Nd:YAG laser. The synthesized nanoparticles were characterized with SEM and EDX analysis, dynamic light scattering technique, absorption and luminescence spectroscopies. The average size of synthesized nanoparticles which is from 25 to 100 nm demonstrates a linear dependence on molar concentration of the used solution. Optical and luminescence properties of obtained Ag nanoparticles were demonstrated...
December 2016: Acta Chimica Slovenica
https://www.readbyqxmd.com/read/27999252/a-visualization-method-for-corrosion-damage-on-aluminum-plates-using-an-nd-yag-pulsed-laser-scanning-system
#16
Inbok Lee, Aoqi Zhang, Changgil Lee, Seunghee Park
This paper proposes a non-contact nondestructive evaluation (NDE) technique that uses laser-induced ultrasonic waves to visualize corrosion damage in aluminum alloy plate structures. The non-contact, pulsed-laser ultrasonic measurement system generates ultrasonic waves using a galvanometer-based Q-switched Nd:YAG laser and measures the ultrasonic waves using a piezoelectric (PZT) sensor. During scanning, a wavefield can be acquired by changing the excitation location of the laser point and measuring waves using the PZT sensor...
December 16, 2016: Sensors
https://www.readbyqxmd.com/read/27991702/effective-photo-and-triboluminescent-euiii-coordination-polymers-with-rigid-triangular-spacer-ligands
#17
Yasuchika Hasegawa, Shiori Tateno, Masanori Yamamoto, Takayuki Nakanishi, Yuichi Kitagawa, Tomohiro Seki, Hajime Ito, Koji Fushimi
Luminescent EuIII coordination polymers with rigid triangular spacer ligands are reported. The EuIII coordination polymer, [Eu3(hfa)9(tppb)2]n (hfa: hexafluoroacetylacetonate, tppb: tris(4-diphenylphosphorylphenyl)benzene), shows high thermo-stability (decomposition temperature = 354˚C) and photoluminescence quantum yield (Φ4f-4f = 82%, photosensitized energy transfer efficiency = 78%). The triboluminescence efficiency of Eu(III) coordination polymer with triangular spacers under laser pulse irradiation (Nd: YAG, λ = 1064 nm, pulse width = 5 ns, pulse energy = 0...
December 19, 2016: Chemistry: a European Journal
https://www.readbyqxmd.com/read/27984754/laser-induced-optical-breakdown-spectroscopy-of-polymer-materials-based-on-evaluation-of-molecular-emission-bands
#18
Stefan Trautner, Juraj Jasik, Christian G Parigger, Johannes D Pedarnig, Wolfgang Spendelhofer, Johannes Lackner, Pavel Veis, Johannes Heitz
Laser-induced breakdown spectroscopy (LIBS) for composition analysis of polymer materials results in optical spectra containing atomic and ionic emission lines as well as molecular emission bands. In the present work, the molecular bands are analyzed to obtain spectroscopic information about the plasma state in an effort to quantify the content of different elements in the polymers. Polyethylene (PE) and a rubber material from tire production are investigated employing 157nmF2 laser and 532nm Nd:YAG laser ablation in nitrogen and argon gas background or in air...
December 2, 2016: Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy
https://www.readbyqxmd.com/read/27982146/pulsed-nd-yag-laser-induced-photoreaction-of-cis-cis-1-3-cyclooctadiene-at-266-nm-selective-cyclization-to-cis-bicyclo-4-2-0-oct-7-ene
#19
Keiko Komori-Orisaku, Yui Hirose, Izumi Iwakura
Nanosecond-scale pulsed laser irradiation of cis,cis-1,3-cyclooctadiene via an Nd:YAG laser at 266 nm induced highly selective cyclization of the 1,3-diene moiety to afford cis-bicyclo[4.2.0]oct-7-ene in high yield. The pulsed Nd:YAG laser light is highly monochromatic thereby allowing efficient control of the photoreaction selectivity by controlling the photostationary state.
December 16, 2016: Photochemical & Photobiological Sciences
https://www.readbyqxmd.com/read/27979160/laser-induced-breakdown-spectroscopy-a-rapid-tool-for-the-identification-and-quantification-of-minerals-in-cucurbit-seeds
#20
Jyotsana Singh, Rohit Kumar, Shikha Awasthi, Vinti Singh, A K Rai
Laser-induced breakdown spectroscopy (LIBS) was investigated to estimate the viability as a simple and rapid method for analysis of nutrient elements in seed kernels of cucurbits. LIBS spectra were recorded in the range of 200-975nm by using Q-switched Nd:YAG laser at 532nm (4ns, 10Hz) attached to echelle spectrometer with intensified charged coupled device (ICCD). The spectral analysis revealed the presence of several elements like C, O, N, Mg, Ca, Na and K in seeds. The quantification of elements (Mg, Ca, Na and K) through LIBS was done using calibration curve method in which all calibration curve shows good linearity (r>0...
April 15, 2017: Food Chemistry
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