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Nd Yag laser

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https://www.readbyqxmd.com/read/28432681/retrospective-single-center-study-of-the-efficacy-of-large-spot-532%C3%A2-nm-laser-for-the-treatment-of-facial-capillary-malformations-in-44-patients-with-the-use-of-three-dimensional-image-analysis
#1
Bartłomiej Kwiek, Michał Rożalski, Cezary Kowalewski, Marcin Ambroziak
OBJECTIVE: We wanted to asses the efficacy of large spot 532 nm laser for the treatment of facial capillary malformations with the use of three-dimensional (3D) image analysis. STUDY DESIGN AND METHODS: Retrospective single center study on previously non-treated patients with facial capillary malformations (CM) was performed. A total of 44 consecutive Caucasian patients aged 5-66 were included. Patients had 3D photography performed before and after and had at least one single session of treatment with 532 nm neodymium-doped yttrium aluminum garnet (Nd:YAG) laser with contact cooling, fluencies ranging from 8 to 11...
April 22, 2017: Lasers in Surgery and Medicine
https://www.readbyqxmd.com/read/28430211/compact-high-power-high-beam-quality-quasi-cw-microsecond-five-pass-zigzag-slab-1319%C3%A2-%C3%A2-nm-amplifier
#2
Chuan Guo, Junwei Zuo, Qi Bian, Chang Xu, Qinshuang Zong, Yong Bo, Yu Shen, Nan Zong, Hongwei Gao, Yanyong Lin, Lei Yuan, Yang Liu, Dafu Cui, Qinjun Peng, Zuyan Xu
We demonstrate a compact, high-power, quasi-continuous-wave (QCW) end-pumped 1319 nm Nd:YAG slab amplifier laser with good beam quality. The laser is based on a QCW pulse Nd:YAG master oscillator and Nd:YAG slab amplifier with multi-pass zigzag architecture. The amplifier operates at a pulse repetition frequency of 500 Hz and pulse width of ∼105  μs, delivering a maximum output power of 51.5 W under absorbed pump power of 217.8 W and corresponding to an extraction efficiency of 14.2%. The beam quality factor is measured to be Mx2=1...
April 20, 2017: Applied Optics
https://www.readbyqxmd.com/read/28428827/fundamental-research-on-the-action-mechanism-of-the-800-nm-semiconductor-laser-on-skin-blackheads-and-coarse-pores
#3
Jie Lin, Li Jing, Hao Zhu, Fu-Sheng Dong
The aim of the study was to determine the mechanism of action of the 800 nm semiconductor laser on skin blackheads and coarse pores. A total of 24 healthy purebred short-haired male guinea pigs, weighing 350-400 g, were selected and smeared with 0.5 ml coal tar suspension evenly by injector once daily. Treatment was continued for 14 days to form an experimental area of 8×3 cm on the back of the guinea pigs. The animals were divided into the following groups: Normal control group (NC), low-dose laser treatment group (L-LS), high-dose laser treatment group (H-LS), and Q-switched Nd:YAG treatment group (QC)...
January 2017: Experimental and Therapeutic Medicine
https://www.readbyqxmd.com/read/28426292/efficacy-of-three-different-lasers-on-eradication-of-enterococcus-faecalis-and-candida-albicans-biofilms-in-root-canal-system
#4
Silvija Kasić, Marita Knezović, Nataša Beader, Dragana Gabrić, Ana Ivanišević Malčić, Anja Baraba
OBJECTIVE: The objective was to compare the efficacy of three different lasers in disinfection of root canals inoculated with Enterococcus faecalis and Candida albicans biofilms. BACKGROUND: Endodontic space disinfection depends on the type of root canal irrigant used and the way it is delivered and agitated because irrigants have limited ability to reach all parts of root canal system. MATERIALS AND METHODS: Thirty single-rooted human teeth were selected...
April 20, 2017: Photomedicine and Laser Surgery
https://www.readbyqxmd.com/read/28418076/ultrasonic-modulation-of-tissue-optical-properties-in-ex-vivo-porcine-skin-to-improve-transmitted-transdermal-laser-intensity
#5
Paul J D Whiteside, Chenxi Qian, Nicholas Golda, Heather K Hunt
BACKGROUND AND OBJECTIVE: Applications of light-based energy devices involving optical targets within the dermis frequently experience negative side-effects resultant from surface scattering and excess optical absorption by epidermal melanin. As a broadband optical absorber, melanin decreases the efficacy of light-based treatments throughout the ultraviolet, visible, and near-infrared spectra while also generating additional heat within the surface tissue that can lead to inflammation or tissue damage...
April 18, 2017: Lasers in Surgery and Medicine
https://www.readbyqxmd.com/read/28414351/phase-matching-properties-of-baga-sub-4-sub-se-sub-7-sub-for-shg-and-sfg-in-the-0-901-10-5910%C3%A2-%C3%A2-%C3%AE-m-range
#6
Kiyoshi Kato, Kentaro Miyata, Valentin Petrov
We report new experimental results on the phase-matching properties of a BaGa<sub>4</sub>Se<sub>7</sub> crystal for harmonic generation of a Nd:YAG laser-pumped AgGaS<sub>2</sub> optical parametric oscillator (OPO) and a CO<sub>2</sub> laser in the 0.901-10.5910 μm range. In addition, we present new Sellmeier equations that provide a good reproduction of the present experimental results as well as the published data points for a Nd:YAG laser-pumped OPO and an optical parametric amplifier (OPA) in the 3...
April 10, 2017: Applied Optics
https://www.readbyqxmd.com/read/28414343/effect-of-hydrocarbon-molecular-decomposition-on-palladium-assisted-laser-induced-plasma-ablation
#7
Alireza Moosakhani, Parviz Parvin, Seyedeh Zahra Mortazavi, Ali Reyhani, Shariar Abachi
The Q-switched Nd:YAG laser is focused on a palladium target in the control chamber filled with various hydrocarbon atmospheres (C1-C4) to investigate their effect on the palladium ablated mass, gas reaction products, and corresponding plasma parameters (such as electron density N<sub>e</sub> and plasma temperature T<sub>e</sub>) during molecular decomposition. The plasma parameters arise mainly from the Pd nanocatalytic activity during the laser-induced plasma process. We compare synthetic air atmosphere to hydrocarbon media to understand how the latter generates excess heat via oxygen-free exothermic (recombination) reactions...
April 10, 2017: Applied Optics
https://www.readbyqxmd.com/read/28409778/linewidth-enhancement-factor-measurement-based-on-fm-modulated-optical-injection-application-to-rare-earth-doped-active-medium
#8
Aurélien Thorette, Marco Romanelli, Marc Vallet
A new method for measuring the linewidth enhancement factor of a laser is proposed. It is based on frequency-modulated optical injection, combined with dual-frequency laser operation. The linewidth enhancement factor α is deduced from the experimental data using a theoretical analysis based on a standard rate equation model. As the intracavity power is kept constant, the method frees the process from the thermal effects that are usually present in AM/FM techniques. Measurement of α=0.28±0.04 in a diode-pumped Nd:YAG laser demonstrates that the method is well-suited for characterizing small values of α...
April 15, 2017: Optics Letters
https://www.readbyqxmd.com/read/28405537/vascular-air-embolism-during-bronchoscopy-procedures-incidence-pathophysiology-diagnosis-management-and-outcomes
#9
REVIEW
Venkatkiran Kanchustambham, Swetha Saladi, Kris Mehta, John Mwangi, Zafar Jamkhana, Setu Patolia
Vascular air embolism (VAE) is a rare, but potentially fatal complication of invasive medical or surgical procedures. It is a very rare complication of bronchoscopy and is most frequently reported with therapeutic bronchoscopy with Argon plasma coagulation (APC) or neodymium-doped yttrium aluminum garnet (Nd-YAG) laser. Despite being rare, as a result of its high chance of mortality and morbidity, it is imperative that physicians have high clinical suspicion to allow for early recognition and treatment. In this article, we provide a concise review of the incidence, pathophysiology, diagnosis management and outcomes of air embolism during bronchoscopy procedures...
March 9, 2017: Curēus
https://www.readbyqxmd.com/read/28394958/-electrocautery-and-bronchoscopy-as-a-first-step-for-the-management-of-central-airway-obstruction-and-associated-hemoptysis
#10
Alfredo Jalilie, Juan Carlos Carvajal, Rodrigo Aparicio, Manuel Meneses
BACKGROUND: Central airway obstruction caused by malignant or benign lesions, associated in some cases with hemoptysis, is a condition with high morbidity and mortality. The use of electrocautery by flexible bronchoscopy is an initial treatment option with immediate improvement of obstruction symptoms. It is as effective as Nd: YAG laser. AIM: To describe the usefulness of electrocautery in the management of central obstruction of the airway and hemoptysis. MATERIAL AND METHODS: A retrospective, descriptive study of patients referred for management of central airway obstruction or associated hemoptysis...
November 2016: Revista Médica de Chile
https://www.readbyqxmd.com/read/28394665/comparison-of-q-switched-nd-yag-laser-alone-versus-its-combination-with-ultra-pulse-co2-laser-for-the-treatment-of-black-tattoo
#11
Mithila Vanarase, Ram Krishan Gautam, Pooja Arora, Sonali Bajaj, Neha Meena, Ananta Khurana
BACKGROUND: Q-switched lasers are conventionally used for the treatment of black tattoo. However they require multiple sittings and the response may be slow due to competing epidermal pigment in dark skin. OBJECTIVE: To compare the efficacy of Q Switched Nd:YAG laser alone with its combination with ultrapulse CO2 in black tattoo removal. MATERIALS AND METHODS: Sixty patients of black tattoo were randomized into two groups. Group A was treated with QS Nd:YAG laser (1064 nm) alone and group B received combination of ablative ultrapulse CO2 followed by fixed dose QS Nd:YAG laser (1064 nm), at 6 weeks interval for a maximum of 6 sittings...
April 10, 2017: Journal of Cosmetic and Laser Therapy: Official Publication of the European Society for Laser Dermatology
https://www.readbyqxmd.com/read/28394120/h-d-analysis-employing-low-pressure-microjoule-picosecond-laser-induced-breakdown-spectroscopy
#12
Zener Sukra Lie, Marincan Pardede, Eric Jobiliong, Hery Suyanto, Davy Putra Kurniawan, Rinda Hedwig, Muliadi Ramli, Ali Khumaeni, Tjung Jie Lie, Koo Hendrik Kurniawan, Kiichiro Kagawa, May On Tjia
An experimental study is conducted in search of the much needed experimental method for practical and minimally destructive analysis of hydrogen (H) and deuterium (D) in a nuclear power plant. For this purpose, a picosecond (ps) Nd:YAG laser is employed and operated with 300-500 μJ output energies in a variety of ambient gases at various gas pressures. The sample chamber used is specially designed small quartz tube with an open end that can be tightly fitted to the sample surface. It is found that ambient Ar gas at reduced pressure of around 0...
April 17, 2017: Analytical Chemistry
https://www.readbyqxmd.com/read/28392660/primary-cutaneous-aspergillosis-after-tattoo-removal-using-a-1-064-nm-q-switched-nd-yag-laser-in-an-immunocompetent-patient
#13
Hyeong-Rae Kim, Jung-Min Shin, Jin-Hyup Lee, Hae-Eul Lee, Myung Im, Young Lee, Chang-Deok Kim, Young-Joon Seo, Jeung-Hoon Lee
No abstract text is available yet for this article.
April 2017: Annals of Dermatology
https://www.readbyqxmd.com/read/28391597/contrast-enhanced-ultrasound-imaging-in-vivo-with-laser-activated-nanodroplets
#14
Heechul Yoon, Steven K Yarmoska, Alexander S Hannah, Changhan Yoon, Kristina A Hallam, Stanislav Y Emelianov
PURPOSE: This study introduces a real-time contrast-enhanced ultrasound imaging method with recently developed laser-activated nanodroplets (LANDs), a new class of phase-change nanometer-scale contrast agents that provides perceptible, sustained high-contrast with ultrasound. METHODS: In response to pulsed laser irradiation, the LANDs-, which contain liquid perfluorohexane and optical fuses-blink (vaporize and recondense). That is, they change their state from liquid nanodroplets to gas microbubbles, and then back to liquid nanodroplets...
April 9, 2017: Medical Physics
https://www.readbyqxmd.com/read/28391435/evaluation-of-different-treatment-protocols-for-dentin-hypersensitivity-an-18-month-randomized-clinical-trial
#15
Anely Oliveira Lopes, Carlos de Paula Eduardo, Ana Cecília Correa Aranha
This randomized and longitudinal in vivo study aimed to assess different protocols for the treatment of dentin hypersensitivity with low-power laser (with different doses), high-power laser, and a desensitizing agent, for a period of 12 and 18 months. The lesions from 32 patients (117 lesions), who were submitted to the inclusion and exclusion criteria, were divided into nine groups (n = 13): G1: Gluma Desensitizer (Heraeus Kulzer), G2: low-power laser with low dose (three points of irradiation in vestibular portion and an apical point 30 mW, 10 J/cm(2), 9 s per point with the wavelength of 810 nm, with three sessions with an interval of 72 h), G3: low-power laser with high dose (one point in the cervical area, and one apical point 100 mW, 40 J/cm(2), 11 s per point with the wavelength of 810 nm in three sessions with an interval of 72 h), G4: low-power laser with low dose + Gluma Desensitizer, G5: low-power laser with high dose + Gluma Desensitizer, G6: Nd:YAG laser (Power Laser™ ST6, Research® in contact 1...
April 8, 2017: Lasers in Medical Science
https://www.readbyqxmd.com/read/28389668/photoacoustic-imaging-reveals-hidden-underdrawings-in-paintings
#16
George J Tserevelakis, Ilianna Vrouvaki, Panagiotis Siozos, Krystallia Melessanaki, Kostas Hatzigiannakis, Costas Fotakis, Giannis Zacharakis
A novel, non-invasive, imaging methodology, based on the photoacoustic effect, is introduced in the context of artwork diagnostics with emphasis on the uncovering of hidden features such as underdrawings or original sketch lines in paintings. Photoacoustic microscopy, a rapidly growing imaging method widely employed in biomedical research, exploits the ultrasonic acoustic waves, generated by light from a pulsed or intensity modulated source interacting with a medium, to map the spatial distribution of absorbing components...
April 7, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28389075/the-antibacterial-effect-of-nd-yag-laser-treatment-of-teeth-with-apical-periodontitis-a%C3%A2-randomized-controlled-trial
#17
Maria Granevik Lindström, Eva Wolf, Helena Fransson
INTRODUCTION: The aim of this blind, in vivo, randomized controlled trial was to evaluate the antibacterial effect of Nd:YAG laser irradiation in endodontic treatment of single-rooted teeth with apical periodontitis. The hypothesis was that mechanical enlargement of the root canal and Nd:YAG laser irradiation would yield more negative bacterial samples than conventional treatment. METHODS: Forty-one patients (45 teeth) were allocated to the laser (n = 22) or control (n = 23) group...
April 4, 2017: Journal of Endodontics
https://www.readbyqxmd.com/read/28388305/treatment-of-vascular-lesions-located-in-the-lip-and-in-the-oral-cavity-with-nd-yag-laser
#18
Julien Totti Bastos, Laila Klotz de Almeida Balassiano, Camila Roos Mariano da Rocha, Bruno Messias Pires de Freitas, Leonardo Gonçalves Bravo, Bruna Souza Felix Bravo
Vascular lesions are common complaints reported in clinics and patients seeking treatment for aesthetic or functional issues. Vascular lesions such as hemangiomas can be found in the oral cavity and some therapeutic modalities can be used in the treatment of these lesions, which the Nd: YAG laser shows good results for easy implementation, fewer complications and satisfactory results. This study describes technique and outcome of a case of hemangioma located on the tongue treated with Nd: YAG laser.
April 7, 2017: Journal of Cosmetic and Laser Therapy: Official Publication of the European Society for Laser Dermatology
https://www.readbyqxmd.com/read/28388282/combined-pulsed-dye-laser-and-fiberoptic-nd-yag-laser-for-the-treatment-of-hypertrophic-port-wine-stain
#19
Mohammed Radmanesh, Ramin Radmanesh
The hypertrophic port wine stain (PWS) is only partially and superficially treated with the Pulsed dye laser(PDL) because of its limited depth of penetration. We used combined PDL and fiberoptic 1444nm Nd-YAG laser to treat a case with hypertrophic PWS. METHOD: After tumescent anesthesia, few holes were made by a 16 gauge needle on different sides of the lesion. The fiberoptic tip was of 1444nm Nd-YAG laser was inserted within the holes and was pushed forward while triggering. In a fan pattern and by a back and forth movement, the subcutaneous and deep dermal areas were coagulated...
April 7, 2017: Journal of Cosmetic and Laser Therapy: Official Publication of the European Society for Laser Dermatology
https://www.readbyqxmd.com/read/28380993/temperature-stable-operation-of-ycob-crystal-for-giant-pulse-green-microlaser
#20
Arvydas Kausas, Pascal Loiseau, Gerard Aka, Yanqing Zheng, Lihe Zheng, Takunori Taira
In this work the performance of two yttrium calcium oxyborate (YCOB) crystals made by Czochralski and Bridgman growth process was measured. By using high peak power, passively Q-switched Nd<sup>3+</sup>:YAG/Cr<sup>4+</sup>:YAG microlaser, high conversion second harmonic generation efficiency were obtained. Laser pulses at 532 nm with 1.14 mJ energy and 223 ps duration were obtained with a 15-mm long YCOB crystal that was grown by Bridgman method. The conversion efficiency was 70.2%, comparable with the conversion efficiency of 72...
March 20, 2017: Optics Express
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