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Nd Yag laser

Nabil Mokrani, Philippe Gillard
This paper presents a physical and statistical approach to laser-induced breakdown in n-decane/N2  + O2 mixtures as a function of incident or absorbed energy. A parametric study, with pressure, fuel purity and equivalence ratio, was conducted to determine the incident and absorbed energies involved in producing breakdown, followed or not by ignition. The experiments were performed using a Q-switched Nd-YAG laser (1064 nm) inside a cylindrical 1-l combustion chamber in the range of 1-100 mJ of incident energy...
March 26, 2018: Journal of Hazardous Materials
Oguzhan Gorler, Ihsan Hubbezoglu, Melih Ulgey, Recai Zan, Kubra Guner
OBJECTIVE: The aim of this study was to examine the shear bond strength (SBS) of ceromer and nanohybrid composite to direct laser sintered (DLS) Cr-Co and Ni-Cr-based metal infrastructures treated with erbium-doped yttrium aluminum garnet (Er:YAG), neodymium-doped yttrium aluminum garnet (Nd:YAG), and potassium titanyl phosphate (KTP) laser modalities in in vitro settings. METHODS: Experimental specimens had four sets (n = 32) including two DLS infrastructures with ceromer and nanohybrid composite superstructures and two Ni-Cr-based infrastructures with ceromer and nanohybrid composite superstructures...
April 2018: Photomedicine and Laser Surgery
Ze-Min Zhong, Ye-Mei Yang, Si-Tong Zhou, Yong-Xuan Hu, Zu-Hao Mao, Zhong Wu, Xue Han, Kang-Xing Liu, Shi-Yun Hunag, Yan-Qing Hu, Yan Lu, Xian-Yi Zhou
OBJECTIVE: To evaluate the efficacy and safety of 0.9-ms 1064-nm Nd:YAG laser alone or combined with itraconazole for treatment of toenail onychomycosis. METHODS: A total of 37 patients with onychomycosis (178 toenails) were randomly assigned to groups A and B, and each group was further divided into different subgroups according to the Scoring Clinical Index of Onychomycosis (SCIO) and Onychomycosis Severity Index (OSI) scoring. All the patients were treated with 0...
March 20, 2018: Nan Fang Yi Ke da Xue Xue Bao, Journal of Southern Medical University
Elisabeth Richert, Stefan Koinzer, Jan Tode, Kerstin Schlott, Ralf Brinkmann, Jost Hillenkamp, Alexa Klettner, Johann Roider
Purpose: To investigate the effect of selective retina therapy (SRT) on the release of AMD-relevant cell mediators, such as matrix metalloproteinases (MMPs), VEGF, and pigment epithelium derived factor (PEDF) using different laser spot sizes and densities. Methods: Porcine RPE-choroid explants were treated with a pulsed 532 nm Nd:YAG laser using (1) large spot sizes, (2) small spot sizes with a high-density (hd) treatment, and (3) small spot sizes with a low-density (ld) treatment...
March 1, 2018: Investigative Ophthalmology & Visual Science
Jing Zhang, Ruiqing Zhen, Chunsheng Wei
PURPOSE: The objectives of this study were to observe the regulating effect of KTP laser and Nd:YAG laser in the repair of vocal fold scars. METHODS: All rabbits were injured in the muscular layer with a sharp instrument, and then the vocal folds were treated with a KTP laser and a Nd:YAG laser at a power of 2, 4, 6 and 8 W 1 month after the injury. One month after treatment, the rabbits were killed and the throats were removed to detect changes in histology and gene expression of the vocal fold scar after laser therapy...
April 2, 2018: European Archives of Oto-rhino-laryngology
Kei Negishi, Hirotaka Akita, Yukiko Matsunaga
OBJECTIVES: Quality-switched (QS) lasers are known to be an effective treatment for removing solar lentigines, however, high incidence of post-inflammatory hyperpigmentation (PIH) is a concern in darker skin types. The objective of this study was to evaluate the efficacy and safety of a dual-wavelength and dual-pulse width picosecond Nd:YAG laser for removing solar lentigines in Asians. METHODS: This was a prospective, IRB-approved study. Twenty cases with solar lentigines on the face were enrolled for treatment and evaluated at 1- and 3-month after the final treatment...
April 2, 2018: Lasers in Surgery and Medicine
Stacie Gregory, Patricia E Burrows, Herodotos Ellinas, Michael Stadler, Robert H Chun
INTRODUCTION: Extensive cervicofacial venous malformations (VM) pose significant challenges to a patient's quality of life (altered breathing, dysphagia, dysarthria). Treatment options include: 1) Surgical debulking; 2) Sclerotherapy; 3) laser therapy; or 4) Combined modalities. Recent studies have demonstrated the importance of multimodality and multidisciplinary management of these patients. However, no studies have described combined single anesthetic laser and sclerotherapy treatment...
May 2018: International Journal of Pediatric Otorhinolaryngology
Yu-Chan Guan, Yung-Hsiang Chang, Yi-Chieh Liao, Jin-Long Peng, Li-Bang Wang, Jow-Tsong Shy
In our previous work on the Lamb-dips of the ν2 fundamental band transitions of H3 + , the saturated absorption spectrum was obtained by third-derivative spectroscopy using frequency modulation with an optical parametric oscillator (OPO). However, frequency modulation also caused errors in the absolute frequency determination. To solve this problem, we built a tunable offset locking system to lock the pump frequency of the OPO to an iodine-stabilized Nd:YAG laser. With this improvement, we were able to scan the OPO idler frequency precisely and obtain the saturated absorption profile using intensity modulation...
March 28, 2018: Journal of Chemical Physics
Martin Maurel, Matthieu Chafer, Abhilash Amsanpally, Muhammad Adnan, Foued Amrani, Benoit Debord, Luca Vincetti, Frédéric Gérôme, Fetah Benabid
We report on the development of hypocycloid core-contour inhibited-coupling (IC) Kagome hollow-core photonic crystal fibers (HC-PCFs) with record transmission loss and spectral coverage that include the common industrial laser wavelengths. Using the scaling of the confinement loss with the core-contour negative curvature and the silica strut thickness, we fabricated an IC Kagome HC-PCF for Yb and Nd:Yag laser guidance with record loss level of 8.5 dB/km associated with a 225-nm-wide 3-dB bandwidth. A second HC-PCF is fabricated with reduced silica strut thickness while keeping the hypocycloid core contour...
April 1, 2018: Optics Letters
Weiping Deng, Tao Yang, Jianping Cao, Erjun Zang, Liufeng Li, Lisheng Chen, Zhanjun Fang
We experimentally demonstrate a monolithic single-frequency nonplanar ring oscillator (NPRO) laser pumped by diode lasers from a thermally excited ground level directly into a metastable level of Nd3+ :YAG gain medium. Continuous-wave output power of 4.54 W is obtained at 1064 nm with 7.6 W input at 885 nm, and the slope efficiency is 76.9% at incident power above 2 W. Compared with the 50.7% slope efficiency obtained using 808 nm pumping for the same NPRO, this direct pumping shows a potential advantage in improving the energy efficiency...
April 1, 2018: Optics Letters
Oscar Muñoz Moreno-Arrones, Natalia Jimenez, Adrian Alegre-Sanchez, Pablo Fonda, Pablo Boixeda
Glomuvenous malformations are uncommon simple vascular malformations that might be present at birth or appear during childhood that have been classically classified as a subtype of venous malformations. Sclerotherapy and surgery have been used in the past as treatments for this condition although with disappointing results in large glomangiomas. The treatment of these lesions has still not been standardized. We conducted a retrospective study of 17 patients treated with dual wavelength PDL-Nd:YAG. The majority of the patients experience a reduction of at least a 60% in their glomuvenous malformations...
March 29, 2018: Lasers in Medical Science
M Roth, L Eisenkopf, D Engineer, J C Schmidt
Acute premacular bleeding is often associated with vasoproliferative retinal changes, vascular anomalies or a Valsalva maneuver. The diagnosis is made during the funduscopic examination and can if necessary be confirmed with optical coherence tomography (OCT). This article presents a case example with a sub-inner limiting membrane (ILM)/sub-hyaloidal bleeding. Furthermore, we present various treatment options and give an overview on the use of the Nd:YAG laser for laser membranotomy as a minimally invasive treatment option with a low complication profile...
March 28, 2018: Der Ophthalmologe: Zeitschrift der Deutschen Ophthalmologischen Gesellschaft
Tiago Monteiro, Andreia Soares, Ricardo Dourado Leite, Nuno Franqueira, Fernando Faria-Correia, Fernando Vaz
Purpose: To evaluate and compare the changes in refraction and effective intraocular lens (IOL) position between a plate-haptic IOL and a c-loop single-piece IOL after neodymium-doped yttrium aluminium garnet (YAG) laser posterior capsulotomy. Methods: In a prospective study, anterior chamber depth and subjective refraction were measured in 110 pseudophakic eyes from 110 patients, before and 1 month after YAG laser capsulotomy. Patients were divided into 2 groups according to the IOL design: group 1 (plate-haptic acrylic hydrophilic AT LISA tri 839MP® ) and group 2 (c-loop acrylic hydrophobic single-piece AcrySof® SA60AT)...
2018: Clinical Ophthalmology
Denise K Woo, German Treyger, Marsha Henderson, Richard H Huggins, Diane Jackson-Richards, Iltefat Hamzavi
BACKGROUND: Acne keloidalis nuchae (AKN) is a chronic scarring folliculitis with limited interventions of both high efficacy and low morbidity. OBJECTIVE: To assess the efficacy of the long-pulsed 1064-nm neodymium-doped yttrium-aluminum-garnet (Nd:YAG) laser and topical steroids as a treatment for AKN compared to topical steroids alone. METHODS: We conducted a single-blinded, randomised, within-patient right-left controlled trial (n = 13)...
March 2018: Journal of Cutaneous Medicine and Surgery
Motazz A Alarfaj, Abdulmajeed A Hasen, Saeed S Al-Yami
Purpose: To report a case of traumatic subhyaloid macular hemorrhage with severe sudden vision loss treated successfully with Neodymium-Doped Yttrium Aluminium Garnet Laser (Nd:YAG laser). Observations: A 16-year-old boy presented to the eye clinic with acute vision loss secondary to blunt trauma by a stone to his left eye 3 days prior to consultation that caused subhyaloid macular hemorrhage. Nd:YAG laser was performed to open the hyaloid membrane and allow the blood to diffuse into the vitreous cavity and be absorbed...
March 2018: American Journal of Ophthalmology Case Reports
Michael J Murphy
INTRODUCTION: Dark material has been observed embedded within glass slides following Q-switched Nd:YAG laser treatment of tattoos. It appears that these fragments are ejected at high speed from the skin during the treatment. METHOD: Light microscopic analysis of the slides reveals aggregates of dark fragmented material, presumably tattoo ink, with evidence of fractured/melted glass. Photomicrographs reveal that the sizes of these aggregates are in the range 12 μm to 0...
March 25, 2018: Lasers in Surgery and Medicine
Pinar Cevik, Oguz Eraslan, Kursat Eser, Suleyman Tekeli
PURPOSE: The aim of this study was to evaluate the effect of six different surface conditioning methods on the shear bond strength of ceramic brackets bonded to feldspathic porcelain. MATERIALS AND METHODS: A total of 60 feldspathic porcelain disks were fabricated and divided into six subgroups including 10 specimens in each. Specimens were first treated one of the following surface conditioning methods, namely, 37% phosphoric acid (G-H3PO4), 9.4% hydrofluoric acid (G-HF), grinding with diamond burs (G-Grinding), Nd:YAG laser (G-Nd:YAG), Airborne-particle abrasion (G-Abrasion)...
March 2018: International Journal of Artificial Organs
Tanya Moutray, Jennifer R Evans, Noemi Lois, David J Armstrong, Tunde Peto, Augusto Azuara-Blanco
BACKGROUND: Diabetic retinopathy (DR) is a chronic progressive disease of the retinal microvasculature associated with prolonged hyperglycaemia. Proliferative DR (PDR) is a sight-threatening complication of DR and is characterised by the development of abnormal new vessels in the retina, optic nerve head or anterior segment of the eye. Argon laser photocoagulation has been the gold standard for the treatment of PDR for many years, using regimens evaluated by the Early Treatment of Diabetic Retinopathy Study (ETDRS)...
March 15, 2018: Cochrane Database of Systematic Reviews
Jun Ma, Bin Chen, Dong Li, Yue Zhang, Zhaoxia Ying
Port-wine stain (PWS) birthmark is a congenital microvascular malformation of the skin. A 1064-nm Nd:YAG laser can achieve a deeper treatment, but the weak absorption by blood limits its clinical application. Multiple laser pulses (MLPs) are a potential solution to enhance the curative effect of a Nd:YAG laser. To reduce the pulse number (pn ) required for the thermal destruction of the blood vessel, the effect of glucose in conjunction with MLP was investigated. In vivo experiments were performed on a dorsal skin chamber model...
March 14, 2018: Lasers in Medical Science
Xue Chen, Xiaohui Li, Sibo Yang, Xin Yu, Aichun Liu
Lymphoma is a significant cancer that affects the human lymphatic and hematopoietic systems. In this work, discrimination of lymphoma using laser-induced breakdown spectroscopy (LIBS) conducted on whole blood samples is presented. The whole blood samples collected from lymphoma patients and healthy controls are deposited onto standard quantitative filter papers and ablated with a 1064 nm Q-switched Nd:YAG laser. 16 atomic and ionic emission lines of calcium (Ca), iron (Fe), magnesium (Mg), potassium (K) and sodium (Na) are selected to discriminate the cancer disease...
March 1, 2018: Biomedical Optics Express
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