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Nd Yag laser

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https://www.readbyqxmd.com/read/29453616/laser-induced-plasma-spectroscopy-lips-use-of-a-geological-tool-in-assessing-bone-mineral-content
#1
László Andrássy, Izabella Gomez, Ágnes Horváth, Katalin Gulyás, Zsófia Pethö, Balázs Juhász, Harjit Pal Bhattoa, Zoltan Szekanecz
Bone may be similar to geological formulations in many ways. Therefore, it may be logical to apply laser-based geological techniques in bone research. The mineral and element oxide composition of bioapatite can be estimated by mathematical models. Laser-induced plasma spectrometry (LIPS) has long been used in geology. This method may provide a possibility to determine the composition and concentration of element oxides forming the inorganic part of bones. In this study, we wished to standardize the LIPS technique and use mathematical calculations and models in order to determine CaO distribution and bone homogeneity using bovine shin bone samples...
February 17, 2018: Lasers in Medical Science
https://www.readbyqxmd.com/read/29452076/feasibility-of-eus-guided-nd-yag-laser-ablation-of-unresectable-pancreatic-adenocarcinoma
#2
Francesco Maria Di Matteo, Paola Saccomandi, Margareth Martino, Monica Pandolfi, Margherita Pizzicannella, Valerio Balassone, Emiliano Schena, Claudio Marcello Pacella, Sergio Silvestri, Guido Costamagna
BACKGROUND AND AIMS: Endoscopic ultrasound (EUS) has become an interventional technique in which a needle may be used as a vehicle to deliver therapeutic agents. Laser ablation (LA) has been used to treat many primary and secondary neoplasms. This study aimed to assess the feasibility of EUS-guided LA for unresectable (UR) pancreatic cancer. METHODS: Patients with a stage IIb-III pancreatic cancer underwent EUS-guided LA. All patients were unresponsive to previous chemo-radiotherapy...
February 13, 2018: Gastrointestinal Endoscopy
https://www.readbyqxmd.com/read/29444065/compact-burst-mode-nd-yag-laser-for-khz-mhz-bandwidth-velocity-and-species-measurements
#3
Michael E Smyser, K Arafat Rahman, Mikhail N Slipchenko, Sukesh Roy, Terrence R Meyer
A compact-footprint (0.18 m2) flash-lamp-pumped, burst-mode Nd:YAG-based master-oscillator pulsed-amplifier laser is reported with a fundamental 1064 nm output of over 14 J per burst. A directly modulated diode laser seed source is used to generate 10 ms duration arbitrary sequences of 500 kHz doublet or MHz singlet pulses for flow-field velocity or species measurements, respectively. Flexible pulse widths are used to balance the energy distribution of pulse doublets and achieve second-harmonic conversion efficiencies up to 42%...
February 15, 2018: Optics Letters
https://www.readbyqxmd.com/read/29442687/analysis-of-laser-injection-condition-and-electrical-properties-in-local-bsf-for-laser-fired-contact-c-si-solar-cell-applications
#4
Cheolmin Park, Gyuho Choi, Nagarajan Balaji, Minkyu Ju, Youn-Jung Lee, Haeseok Lee, Junsin Yi
A crystalline silicon (c-Si) local-back-contact (LBC) solar cell for which a laser-condition-optimized surface-recombination velocity (SRV), a contact resistance (Rc), and local back surface fields (LBSFs) were utilized is reported. The effect of the laser condition on the rear-side electrical properties of the laser-fired LBC solar cell was studied. The Nd:YAG-laser (1064-nm wavelength) power and frequency were varied to obtain LBSF values with a lower contact resistance. A 10-kHz laser power of 44 mW resulted in an Rc of 0...
July 1, 2018: Journal of Nanoscience and Nanotechnology
https://www.readbyqxmd.com/read/29442664/synthesis-of-au-ag-alloy-nanoparticles-in-deionized-water-by-pulsed-laser-ablation-technique
#5
W Norsyuhada, W M Shukri, Noriah Bidin, Shumaila Islam, Ganesan Krishnan
Au-Ag alloy nanoparticles are physically synthesized using rapid, simple and efficient Q-switched Nd:YAG pulsed laser ablation in liquid technique (PLAL). Au and Ag colloidal solutions are separately prepared by 1064 nm laser ablation of metallic target (gold and silver) which is immersed in deionized water. Au-Ag alloy nanoparticles are prepared by irradiating the mixture of Au and Ag colloidal solutions with 532 nm of second harmonic wavelength of Nd:YAG laser at three different ratio, 3:1, 1:1 and 1:3 within different exposure times...
July 1, 2018: Journal of Nanoscience and Nanotechnology
https://www.readbyqxmd.com/read/29442655/preparation-of-multiwall-carbon-nanotubes-with-zinc-phthalocyanine-hybrid-materials-and-their-nonlinear-optical-nlo-properties
#6
E Ramya, Nabil Momen, D Narayana Rao
Hybrid material of multi walled carbon nanotubes (MWCNT)-zinc phthalocyanine (ZnPcs) (MWCNT-ZnPc) composites were synthesized and compared with ZnPc. Nonlinear optical properties of MWCNT-ZnPc and ZnPc were studied. The synthesized MWCNT-ZnPc characterized by UV-visible absorption spectroscopy, photoluminescence and TEM. Their nonlinear optical properties were measured through Z-scan technique with 800 nm, 110 fs, 1 kHz Ti:Sapphire laser and 532 nm, 30 ps and 10 Hz Nd:YAG laser. The results showed that phthalocyanines were anchored onto the surface of the multi walled carbon nanotubes by using TEM...
July 1, 2018: Journal of Nanoscience and Nanotechnology
https://www.readbyqxmd.com/read/29436720/an-expanded-study-of-long-pulsed-1064-nm-nd-yag-laser-treatment-of-basal-cell-carcinoma
#7
Arisa E Ortiz, R Rox Anderson, Catherine DiGiorgio, Shang I Brian Jiang, Faiza Shafiq, Mathew M Avram
BACKGROUND AND OBJECTIVE: Basal cell carcinoma (BCC) is an indolent form of skin cancer that is rarely life threatening, but can cause significant cosmetic and functional morbidity. Surgical treatments often result in disfiguring scars, while topical therapies frequently result in recurrence. The need for a more effective nonsurgical alternative has led to the investigation of laser treatment of BCC. We have previously conducted a pilot study which showed 100% histologic clearance at high fluences...
February 13, 2018: Lasers in Surgery and Medicine
https://www.readbyqxmd.com/read/29434426/reappraisal-of-percutaneous-transluminal-laser-angioplasty
#8
REVIEW
Shoichi D Takekawa
Background and aims: We devised a technique to treat peripheral arterial disease (PAD) with laser, i.e. percutaneous transluminal laser angioplasty (PTLA). Considerable good results were obtained with PTLA, but it is apparently considered obsolete as a technique to treat occlusive arterial disease of peripheral arteries, perhaps because of the development and improvement of stents and the ease of their use compared to the somewhat intricate technique required for PTLA. Although the author admits the usefulness of stents, they are foreign to a human body...
December 31, 2017: Laser Therapy
https://www.readbyqxmd.com/read/29428894/optimizing-laser-crater-enhanced-raman-scattering-spectroscopy
#9
V N Lednev, P A Sdvizhenskii, M Ya Grishin, A N Fedorov, O V Khokhlova, V B Oshurko, S M Pershin
The laser crater enhanced Raman scattering (LCERS) spectroscopy technique has been systematically studied for chosen sampling strategy and influence of powder material properties on spectra intensity enhancement. The same nanosecond pulsed solid state Nd:YAG laser (532 nm, 10 ns, 0.1-1.5 mJ/pulse) was used for laser crater production and Raman scattering experiments for l-aspartic acid powder. Increased sampling area inside crater cavity is the key factor for Raman signal improvement for the LCERS technique, thus Raman signal enhancement was studied as a function of numerous experimental parameters including lens-to-sample distance, wavelength (532 and 1064 nm) and laser pulse energy utilized for crater production...
January 31, 2018: Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy
https://www.readbyqxmd.com/read/29425152/composite-laser-ceramics-by-advanced-bonding-technology
#10
Akio Ikesue, Yan Lin Aung, Tomosumi Kamimura, Sawao Honda, Yuji Iwamoto
Composites obtained by bonding materials with the same crystal structure and different chemical compositions can create new functions that do not exist in conventional concepts. We have succeeded in bonding polycrystalline YAG and Nd:YAG ceramics without any interstices at the bonding interface, and the bonding state of this composite was at the atomic level, similar to the grain boundary structure in ceramics. The mechanical strength of the bonded composite reached 278 MPa, which was not less than the strength of each host material (269 and 255 MPa)...
February 9, 2018: Materials
https://www.readbyqxmd.com/read/29412199/plasmonic-nanoparticles-embedded-in-single-crystals-synthesized-by-gold-ion-implantation-for-enhanced-optical-nonlinearity-and-efficient-q-switched-lasing
#11
W J Nie, Y X Zhang, H H Yu, R Li, R Y He, N N Dong, J Wang, R Hübner, R Böttger, S Q Zhou, H Amekura, F Chen
We report on the synthesis of embedded gold (Au) nanoparticles (NPs) in Nd:YAG single crystals using ion implantation and subsequent thermal annealing. Both linear and nonlinear absorption of the Nd:YAG crystals have been enhanced significantly due to the embedded Au NPs, which is induced by the surface plasmon resonance (SPR) effect in the visible light wavelength band. Particularly, through a typical Z-scan system excited by a femtosecond laser at 515 nm within the SPR band, the nonlinear absorption coefficients of crystals with Au NPs have been observed to be nearly 5 orders of magnitude larger than that without Au NPs...
February 7, 2018: Nanoscale
https://www.readbyqxmd.com/read/29411172/effect-of-laser-peripheral-iridotomy-using-argon-and-neodymium-yag-lasers-on-corneal-endothelial-cell-density-7-year-longitudinal-evaluation
#12
Takashi Ono, Masaharu Iida, Toshihiro Sakisaka, Keiichiro Minami, Kazunori Miyata
PURPOSE: To evaluate the changes in corneal endothelial cell density (ECD) over a 7-year period after laser peripheral iridotomy (LPI) using argon and neodymium-doped yttrium aluminum garnet (Nd:YAG) lasers. STUDY DESIGN: Retrospective case series. METHODS: Eyes that underwent prophylactic LPI using argon and Nd:YAG lasers were followed up for 7 years. Central corneal endothelial cells were observed by use of noncontact specular microscopy preoperatively and at 1 and 7 years postoperatively...
February 6, 2018: Japanese Journal of Ophthalmology
https://www.readbyqxmd.com/read/29401924/mechano-optical-effects-in-multiwall-carbon-nanotubes-ethanol-based-nanofluids
#13
J A García-Merino, C Mercado-Zúñiga, C R Torres-Sanmiguel, C Torres-Torres
A highly sensitive technique for analyzing surface tension and dynamic viscosity of nanofluids was reported. Multiwall carbon nanotubes suspended in ethanol were evaluated. The assistance of a Fabry-Perot interferometer integrated by a small sample volume fluid allowed us to explore the stability and mechanical properties exhibited by the nanostructures. The surface tension and dynamic viscosity of the colloid was examined by using interferometric optical signals reflected from a remnant drop pending at the end of an optical fiber...
January 22, 2018: Optics Express
https://www.readbyqxmd.com/read/29401914/wavelength-diversification-of-high-power-external-cavity-diamond-raman-lasers-using-intracavity-harmonic-generation
#14
Hadiya Jasbeer, Robert J Williams, Ondrej Kitzler, Aaron McKay, Richard P Mildren
We report a high power quasi-continuous-wave (QCW) 620 nm laser from an external cavity diamond Raman laser utilizing intracavity frequency doubling in lithium triborate. Output power of 30 W for durations of 0.25 ms at 15% conversion efficiency was achieved with a beam quality factor M2 = 1.1 from a free-running Nd:YAG pump laser of M2 = 1.5. The critical design parameters that affect conversion efficiency and power were analysed with the aid of an analytical model. By adaptation to other pump technologies, the diamond approach provides a novel pathway towards high brightness CW beam generation in the visible and ultraviolet regions...
January 22, 2018: Optics Express
https://www.readbyqxmd.com/read/29400580/picosecond-alexandrite-laser-is-superior-to-q-switched-nd-yag-laser-in-treatment-of-minocycline-induced-hyperpigmentation-a-case-study-and-review-of-the-literature
#15
Tom Barrett, Sally de Zwaan
Minocycline is a commonly prescribed tetracycline antibiotic used for the treatment of a number of dermatological conditions including acne and rosacea. Long-term adverse effects of minocycline include cutaneous hyperpigmentation. Various treatment options have been suggested for the treatment of minocycline pigmentation. We report a case of a patient on long-term low-dose minocycline for the treatment of rosacea with type III minocycline hyperpigmentation. A comparison was made between Q-Switch Nd:YAG and picosecond laser over a nine 9-period with treatments spaced 1 month apart, with a clearance in the patient pigmentation after four treatments with picosecond laser...
February 5, 2018: Journal of Cosmetic and Laser Therapy: Official Publication of the European Society for Laser Dermatology
https://www.readbyqxmd.com/read/29399308/comparison-of-tooth-color-change-after-bleaching-with-conventional-and-different-light-activated-methods
#16
Sima Shahabi, Hadi Assadian, Alireza Mahmoudi Nahavandi, Hanieh Nokhbatolfoghahaei
Introduction: The demand for esthetic dental treatments is increasing in recent years mainly due to improved oral hygiene and better maintenance of oral health and teeth in older individuals. Bleaching of discolored anterior teeth is the most popular among esthetic dental treatments. Even individuals with sound teeth and adequate esthetics seek to have whiter teeth in the anterior region. The aim of this study was to evaluate tooth color changes following conventional in-office bleaching techniques compared to light-activated methods using different light sources...
2018: Journal of Lasers in Medical Sciences
https://www.readbyqxmd.com/read/29390720/high-resolution-thomson-scattering-system-for-steady-state-linear-plasma-sources
#17
K Y Lee, K I Lee, J H Kim, T Lho
The high resolution Thomson scattering system with 63 points along a 25 mm line measures the radial electron temperature (Te) and its density (ne) in an argon plasma. By using a DC arc source with lanthanum hexaboride (LaB6) electrode, plasmas with electron temperature of over 5 eV and densities of 1.5 × 1019 m-3 have been measured. The system uses a frequency doubled (532 nm) Nd:YAG laser with 0.25 J/pulse at 20 Hz. The scattered light is collected and sent to a triple-grating spectrometer via optical-fibers, where images are recorded by an intensified charge coupled device (ICCD) camera...
January 2018: Review of Scientific Instruments
https://www.readbyqxmd.com/read/29389868/variation-on-molecular-structure-crystallinity-and-optical-properties-of-dentin-due-to-nd-yag-laser-and-fluoride-aimed-at-tooth-erosion-prevention
#18
Daísa L Pereira, Anderson Z Freitas, Luciano Bachmann, Carolina Benetti, Denise M Zezell, Patricia A Ana
This in vitro study evaluated the compositional, crystalline, and morphological effects promoted by Nd:YAG laser on root dentin, and verified the effects of laser and topical acidulated phosphate fluoride application (APF-gel) on dentin erosion. 180 bovine dentin slabs were randomized into 4 groups (n = 45): G1-untreated, G2-APF-gel (1.23% F-, 4 min), G3-Nd:YAG (1064 nm, 84.9 J/cm², 10 Hz), and G4-APF-gel application followed by Nd:YAG laser irradiation. The compositional, crystalline, and morphological effects promoted by treatments were investigated on five samples of each experimental group...
February 1, 2018: International Journal of Molecular Sciences
https://www.readbyqxmd.com/read/29388843/comparison-of-efficacy-between-long-pulsed-nd-yag-laser-and-pulsed-dye-laser-to-treat-rosacea-associated-nasal-telangiectasia
#19
Won Joo Kwon, Bok Won Park, Eun Byul Cho, Eun Joo Park, Kwang Ho Kim, Kwang Joong Kim
BACKGROUND: Rosacea is characterized by erythema on face, especially erythema and linear telangiectasia on the nose. Currently, various vascular lasers are used for treatment, and among them, are long-pulsed Nd:YAG(LPNY) and pulsed dye laser (PDL). OBJECTIVES: This study compared the efficacy of LPNY and PDL in treating rosacea-associated nasal telangiectasia. METHODS: Patients with rosacea who showed erythema and telangiectasia on the nose were included...
February 1, 2018: Journal of Cosmetic and Laser Therapy: Official Publication of the European Society for Laser Dermatology
https://www.readbyqxmd.com/read/29386831/terminal-deoxynucleotidyl-transferase-mediated-deoxyuridine-triphosphate-nick-end-labeling-tunel-assay-to-characterize-histopathologic-changes-following-thermal-injury
#20
Ji Min Lee, Ji Hyun Park, Bo Young Kim, Il-Hwan Kim
Background: Despite the wide application of lasers and radiofrequency (RF) surgery in dermatology, it is difficult to find studies showing the extent of damage dependent on cell death. Objective: We evaluated histopathologic changes following in vivo thermal damage generated by CO2 laser, 1,444 nm long-pulsed neodymium:yttrium-aluminum-garnet (LP Nd:YAG) laser and RF emitting electrosurgical unit. Methods: Thermal damage was induced by the above instruments on ventral skin of rat...
February 2018: Annals of Dermatology
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