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diode laser

Denise L Sweeney, Erica B Wang, Evan Austin, Jared Jagdeo
BACKGROUND: As body contouring procedures have become more popular, post-procedural skin laxity is a concern. Non-invasive body contouring technologies may effectively reduce body fat, but modestly affect skin tightening. OBJECTIVE: To assess the efficacy and safety of a topical skin tightening agent in combination with hyperthermic diode laser lipolysis. METHODS: Herein, we describe five patients in which a skin tightening concentrate of 5% yeast extract, 2% hydrolyzed rice protein content, and 2...
July 1, 2018: Journal of Drugs in Dermatology: JDD
Richard Švejkar, Jan Šulc, Michal Němec, Pavel Boháček, Helena Jelínková, Bohumil Trunda, Lubomír Havlák, Martin Nikl, Karel Jurek
In this Letter, for the first time, to the best of our knowledge, a pulse and CW laser based on an Er-doped Gd3 Ga2.7 Al2.3 O12 (Er:GGAG) active medium emitting laser radiation at 2.8 μm are presented. With the longitudinal diode pumping, the maximal output energy of 4.9 mJ and slope efficiency of 13.5% in the pulse regime were reached. Using the birefringent MgF2 plate, the line tunability of Er:GGAG at several spectral bands of 2800-2822 nm, 2829-2891 nm, and 2917-2942 nm were obtained.
July 15, 2018: Optics Letters
Francisco J Romero, Alfonso Salinas-Castillo, Almudena Rivadeneyra, Andreas Albrecht, Andres Godoy, Diego P Morales, Noel Rodriguez
This work presents a detailed study of the photothermal ablation of Kapton® polyimide by a laser diode targeting its electrical conductivity enhancement. Laser-treated samples were structurally characterized using Scanning Electron Microscopy (SEM), Raman spectroscopy, X-ray Photoelectron Spectroscopy (XPS), as well as Diffuse Reflectance Infrared Fourier Transform (DRIFT) spectroscopy. The results show that the laser-assisted ablation constitutes a simple one-step and environmental friendly method to induce graphene-derived structures on the surface of polyimide films...
July 11, 2018: Nanomaterials
Supriya Ghosh, Qi Shi, Bapi Pradhan, Pushpendra Kumar, Zhengjun Wang, Somobrata Acharya, Suman Kalyan Pal, Tõnu Pullerits, Khadga Jung Karki
Organometal halide perovskites in the form of nanocrystals (NCs) have attracted enormous attention due to their unique opto-electronic and photoluminescence (PL) properties. It is known that the optical properties of halide perovskites are strongly influenced by phonon scattering, which contributes to the broadening of the PL spectrum and limits the mobility of the charge-carriers. Therefore, investigation of charge carrier interaction with phonons in these materials is not only essential from fundamental point of view but also important for the development of high-efficiency perovskite photovoltaics and light emitting devices...
July 11, 2018: Journal of Physical Chemistry Letters
M Minissale, T Zanon-Willette, I Prokhorov, H Elandaloussi, C Janssen
Tunable electromagnetic sources, such as voltage controlled oscillators (VCO), micro electromechanical systems (MEMS) or diode lasers are often required to be linear during frequency-sweep modulation. In many cases, it might also be sufficient that the degree of the non-linearity can be well controlled. Without further efforts, these conditions are rarely achieved using free running sources. Based on a pre-distortion voltage ramp, we develop in this letter a simple and universal method that minimizes the non-linear frequency response of tunable electromagnetic sources...
June 1, 2018: IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control
Ligiane Souza Dos Santos, Joyce Camilla Saltorato, Marina Gaiato Monte, Rodrigo Labat Marcos, Rodrigo Álvaro Brandão Lopes-Martins, Shaiane Silva Tomazoni, Ernesto Cesar Pinto Leal-Junior, Rodrigo Leal de Paiva Carvalho
Physical exercise generates several benefits in a short time in patients with diabetes mellitus. However, it can increase the chances of muscle damage, a serious problem for diabetic patients. Nonsteroidal anti-inflammatory drugs (NSAIDs) are widely used to treat these injuries, despite the serious adverse effects. In this way, photobiomodulation therapy (PBMT) with low-level laser therapy (LLLT) and/or light emitting diode therapy (LEDT) can be used as an alternative in this case. However, its efficacy in tissue repair of trauma injuries in diabetes mellitus until now is unknown, as well as the combination between PBMT and NSAIDs...
July 10, 2018: Lasers in Medical Science
Song Wang, Sujit K Verma, Inamullah Hakeem Said, Laurenz Thomsen, Matthias S Ullrich, Nikolai Kuhnert
BACKGROUND: Marine diatoms have a higher fucoxanthin content in comparison to macroalgae. Fucoxanthin features many potent bioactive properties, particularly anti-obesity properties. Despite the great potential for harvesting larger amounts of fucoxanthin, the impacts of light quality (light source, intensity, and photoperiod) on fucoxanthin production and the essential proteins involved in fucoxanthin biosynthesis in marine diatoms remain unclear. RESULTS: In the present study, Cylindrotheca closterium was selected from four different species of diatoms based on its high fucoxanthin content and productivity...
July 9, 2018: Microbial Cell Factories
Hae Lee, Yong-Gun Kim, Heung-Sik Um, Beom-Seok Chang, Si Young Lee, Jae-Kwan Lee
Purpose: The aim of this study was to evaluate the antimicrobial effect of a newly devised toothbrush with light-emitting diodes (LEDs) on Porphyromonas gingivalis attached to sandblasted and acid-etched titanium surfaces. Methods: The study included a control group, a commercial photodynamic therapy (PDT) group, and 3 test groups (B, BL, and BLE). The disks in the PDT group were placed in methylene blue and then irradiated with a diode laser. The B disks were only brushed, the BL disks were brushed with an LED toothbrush, and the BLE disks were placed into erythrosine and then brushed with an LED toothbrush...
June 2018: Journal of Periodontal & Implant Science
Nerea Ubierna, Meisha-Marika Holloway-Phillips, Graham D Farquhar
Stable carbon isotopes are a powerful tool to study photosynthesis. Initial applications consisted of determining isotope ratios of plant biomass using mass spectrometry. Subsequently, theoretical models relating C-isotope values to gas exchange characteristics were introduced and tested against instantaneous online measurements of 13 C photosynthetic discrimination. Beginning in the twenty-first century, tunable diode laser spectroscopes with sufficient precision for determining isotope mixing ratios became commercially available...
2018: Methods in Molecular Biology
Mohadeseh Heidari, Reza Fekrazad, Farhad Sobouti, Mohammad Moharrami, Salman Azizi, Hanieh Nokhbatolfoghahaei, Maziar Khatami
The aim of this study was to evaluate the efficacy of low-power of 940-nm diode laser on post-operative pain after undisplaced flap surgery. This randomized clinical trial study was conducted using a split-mouth design. The study participants comprised 30 patients who needed periodontal flap surgery for periodontal pockets on the same tooth on both sides of the mandible. One side of the mandible was subjected to undisplaced flap surgery plus treatment with a 940-nm diode laser, and on the contralateral side, the surgery was conducted without applying the laser...
July 6, 2018: Lasers in Medical Science
Hee Chul Woo, Jin Woo Choi, Jisoo Shin, Sang-Hyun Chin, Myung Hyun Ann, Chang-Lyoul Lee
Organic-inorganic lead halide perovskite is emerging as a potential emissive material for light emitting devices, such as, light emitting diodes (LEDs) and lasers, which has emphasized on the necessity of understanding its fundamental opto-physical properties. In this work, the temperature-dependent photoluminescence (PL) of CH3NH3PbBr3 perovskite quantum dots (QDs), polycrystalline thin film (TF) and single crystal (SC) have been studied. The opto-physical properties, such as exciton-phonon scattering, exciton binding energy and exciton decay dynamics, were investigated...
July 5, 2018: Journal of Physical Chemistry Letters
Chan Hee Nam, Myung Hwa Kim, Seung Phil Hong, Byung Cheol Park
BACKGROUND: A 595-nm pulsed dye laser (PDL) and the fractional 532-nm potassium titanyl phosphate (KTP) laser have also been demonstrated to be effective for facial telangiectasias. OBJECTIVE: To compare the clinical therapeutic effects of a fractional 532-nm KTP laser with those of a 595-nm pulsed dye laser (PDL) for treating facial erythematous skin lesions. METHODS: Twenty healthy adults with facial erythematous skin lesions were treated using a fractional 532-nm KTP laser on one side of the face and a 595-nm PDL on the other cheek...
July 4, 2018: Journal of Cosmetic Dermatology
Qiao Zhang, Yadong Yin
The past decade has witnessed the growing interest in metal halide perovskites as driven by their promising applications in diverse fields. The low intrinsic stability of the early developed organic versions has however hampered their widespread applications. Very recently, all-inorganic perovskite nanocrystals have emerged as a new class of materials that hold great promise for the practical applications in solar cells, photodetectors, light-emitting diodes, and lasers, among others. In this Outlook, we first discuss the recent developments in the preparation, properties, and applications of all-inorganic metal halide perovskite nanocrystals, with a particular focus on CsPbX3 , and then provide our view of current challenges and future directions in this emerging area...
June 27, 2018: ACS Central Science
Elham Khoshbin, Zakiyeh Donyavi, Erfan Abbasi Atibeh, Shahin Kasraei, Rasoul Yousefimashouf, Ghodratollah Roshanaei, Faranak Amani
Objectives: Laser irradiation, as an adjunct to root canal preparation, may increase the success rate of endodontic treatments. This study aimed to assess the effect of neodymium-doped yttrium aluminum garnet (Nd:YAG) and diode lasers on the apical seal of the root canals filled with AH Plus® and mineral trioxide aggregate (MTA)-based sealers. Materials and Methods: This in-vitro experimental study was conducted on 96 single-rooted, single-canal extracted human teeth with closed apices...
January 2018: Journal of Dentistry of Tehran University of Medical Sciences
Alessia Tani, Flaminia Chellini, Marco Giannelli, Daniele Nosi, Sandra Zecchi-Orlandini, Chiara Sassoli
Photobiomodulation (PBM) has been used for bone regenerative purposes in different fields of medicine and dentistry, but contradictory results demand a skeptical look for its potential benefits. This in vitro study compared PBM potentiality by red (635 ± 5 nm) or near-infrared (NIR, 808 ± 10 nm) diode lasers and violet-blue (405 ± 5 nm) light-emitting diode operating in a continuous wave with a 0.4 J/cm² energy density, on human osteoblast and mesenchymal stromal cell (hMSC) viability, proliferation, adhesion and osteogenic differentiation...
July 3, 2018: International Journal of Molecular Sciences
Muhammad Atif Khan, Servin Rathi, Changhee Lee, Yunseob Kim, Hanul Kim, Dongmok Whang, Sun Jin Yun, Doo-Hyeb Youn, Kenji Watanabe, Takashi Taniguchi, Gil-Ho Kim
Graphene-MoS<sub>2</sub> (GM) heterostructure based diode is fabricated using asymmetric contacts to MoS<sub>2</sub> as well as an asymmetric top gate (ATG). The GM diode exhibits a rectification-ratio of 5 from asymmetric contacts which is improved to 10<sup>5</sup> after the incorporation of ATG. This improvement is attributed to the asymmetric modulation of carrier concentration and effective Schottky barrier height by the ATG during forward and reverse bias...
July 3, 2018: Nanotechnology
Song Wu, Yinan Chen, Jinglu Zhang, Wenjing Chen, Sheng Shao, Huijie Shen, Ling Zhu, Ping Ye, Peter Svensson, Kelun Wang
Low-level laser therapy (LLLT) may have an effect on the pain associated with orthodontic treatment. The aim of this study was to evaluate the effect of LLLT on pain and somatosensory sensitization induced by orthodontic treatment. Forty individuals (12-33 years old; mean ± standard deviations: 20.8 ± 5.9 years) scheduled to receive orthodontic treatment were randomly divided into a laser group (LG) or a placebo group (PG) (1:1). The LG received LLLT (810-nm gallium-aluminium-arsenic diode laser in continuous mode with the power set at 400 mW, 2 J·cm-2 ) at 0 h, 2 h, 24 h, 4 d, and 7 d after treatment, and the PG received inactive treatment at the same time points...
July 2, 2018: International Journal of Oral Science
Amit Arvind Agrawal, Ravi Prabhu, Rutuja Sankhe, Shreeprasad Vijay Wagle
Background: High-power level lasers used in health sciences have important photothermal effect. The maximum absorption of the diode laser correlates with the absorption range of hemoglobin, suggesting that red color may be the required chromophore. Hence, we hypothesized that by providing artificial external red chromophore, we can improve the cutting efficiency of diode laser in noninflamed tissue. The aim of the present study was to assess the efficacy and collateral thermal damage produced by a 940 nm diode laser on stained and unstained porcine tissue sample...
June 2018: Contemporary Clinical Dentistry
Manvir Kaur, Yash Paul Dev Sharma, Preetinder Singh, Shivli Sharma, Ankur Wahi
Background: This study was aimed to compare the efficacy and soft tissue wound healing using diode lasers (810 nm) versus conventional scalpel approach as uncovering technique during the second-stage surgery in implants. This was a prospective, randomized study which was conducted on 20 subjects in which the implants were already placed using a two-stage technique. Implant sites were examined and the patients were randomly divided into two groups. Materials and Methods: Patients were randomly divided into two groups, i...
May 2018: Journal of Indian Society of Periodontology
Qiwen Sheng, Guigen Liu, Matthew L Reinke, Ming Han
We report a fiber-optic bolometer based on a high-finesse silicon Fabry-Perot interferometer (FPI). The silicon FPI absorbs and converts the incident radiation into temperature variations, which are interrogated by the shift of the reflection spectrum of the FPI. The FPI is a silicon pillar with one side coated with a high-reflectivity dielectric mirror and the other side coated with a gold mirror. A multimode fiber collimator is applied between the FPI and lead-in single-mode fiber to reduce the round-trip diffraction loss, giving rise to a high-finesse of 35 of the FPI...
June 2018: Review of Scientific Instruments
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