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https://www.readbyqxmd.com/read/29143003/a-mixed-dimensional-light-emitting-diode-based-on-a-p-mos2-nanosheet-and-an-n-cdse-nanowire
#1
Pan Li, Kai Yuan, Der-Yuh Lin, Xiaolong Xu, Yilun Wang, Yi Wan, Haoran Yu, Kun Zhang, Yu Ye, Lun Dai
The construction of the mixed-dimensional van der Waals (vdW) heterostructures with two-dimensional (2D) and one-dimensional (1D) materials can advantageously integrate their respective dimensional properties to produce new device functionalities and/or enhance device performance. In this case, a single semiconductor nanowire (NW) can function as an optical cavity and a gain medium, while the atomically thin 2D material does not strongly absorb the NW's light emission or disturb the optical propagation mode...
November 16, 2017: Nanoscale
https://www.readbyqxmd.com/read/29140334/carrier-envelope-offset-stabilization-of-a-ghz-repetition-rate-femtosecond-laser-using-opto-optical-modulation-of-a-sesam
#2
Sargis Hakobyan, Valentin J Wittwer, Kutan Gürel, Aline S Mayer, Stéphane Schilt, Thomas Südmeyer
We demonstrate, to the best of our knowledge, the first carrier-envelope offset (CEO) frequency stabilization of a GHz femtosecond laser based on opto-optical modulation (OOM) of a semiconductor saturable absorber mirror (SESAM). The 1.05-GHz laser is based on a Yb:CALGO gain crystal and emits sub-100-fs pulses with 2.1-W average power at a center wavelength of 1055 nm. The SESAM plays two key roles: it starts and stabilizes the mode-locking operation and is simultaneously used as an actuator to control the CEO frequency...
November 15, 2017: Optics Letters
https://www.readbyqxmd.com/read/29140329/demonstration-of-a-cw-diode-pumped-ar-metastable-laser-operating-at-4%C3%A2-%C3%A2-w
#3
J Han, M C Heaven, P J Moran, G A Pitz, E M Guild, C R Sanderson, B Hokr
Optically pumped rare gas lasers are being investigated as potential high-energy, high beam quality systems. The lasing medium consists of rare gas atoms (Rg=Ne, Ar, Kr, or Xe) that have been electric discharge excited to the metastable np(5)(n+1)s P32 state. Following optical excitation, helium (He) at pressures of 200-1000 Torr is used as the energy transfer agent to create a population inversion. The primary technical difficulty for this scheme is the discharge production of sufficient Rg* metastables in the presence of >200  Torr of He...
November 15, 2017: Optics Letters
https://www.readbyqxmd.com/read/29134402/modification-in-oxidative-processes-in-muscle-tissues-exposed-to-laser-and-light-emitting-diode-radiation
#4
Victor A Monich, Anna P Bavrina, Svetlana L Malinovskaya
Exposure of living tissues to high-intensity red or near-infrared light can produce the oxidative stress effects both in the target zone and adjacent ones. The protein oxidative modification (POM) products can be used as reliable and early markers of oxidative stress. The contents of modified proteins in the investigated specimens can be evaluated by the 2,4-dinitrophenylhydrazine assay (the DNPH assay). Low-intensity red light is able to decrease the activity of oxidative processes and the DNPH assay data about the POM products in the biological tissues could show both an oxidative stress level and an efficiency of physical agent protection against the oxidative processes...
November 13, 2017: Lasers in Medical Science
https://www.readbyqxmd.com/read/29133970/laser-and-platelet-rich-plasma-to-treat-medication-related-osteonecrosis-of-the-jaws-mronj-a-case-report
#5
Carlo Fornaini, Luigi Cella, Aldo Oppici, Anna Parlatore, Fabio Clini, Matteo Fontana, Giuseppe Lagori, Elisabetta Merigo
Aims: The appropriate management of Medication-Related OsteoNecrosis of the Jaw (MRONJ) is still a challenge for dentists and oral surgeons and in these last years high-technology instruments have been proposed at the different steps of interventions, also combined with promoters of tissue repair.The aim of this report is to show the advantages of a combined approach (laser and PRP) for the treatment of MRONJ. Methods: It is described the case of a patient positive for MRONJ observed at the Odontostomatology and Maxillo-Facial Surgery Unit of the Hospital of Piacenza where surgical approach was performed by using different devices: Er:YAG laser (2940 nm) to remove and vaporize necrotic hard tissue until bleeding bone; Platelet-Rich Plasma (PRP) to stimulate hard and soft tissue healing; diode laser (808 nm) to biostimulate the surgical site...
September 30, 2017: Laser Therapy
https://www.readbyqxmd.com/read/29133943/randomly-polarised-beam-produced-by-magnetooptically-q-switched-laser
#6
Ryohei Morimoto, Taichi Goto, Takunori Taira, John Pritchard, Mani Mina, Hiroyuki Takagi, Yuichi Nakamura, Pang Boey Lim, Hironaga Uchida, Mitsuteru Inoue
Diode-pumped solid-state micro lasers are compact (centimetre-scale), highly stable, and efficient. Previously, we reported Q-switched lasers incorporating rare-earth substituted iron garnet (RIG) film. Here, the first demonstration of the magnetooptical (MO) Q-switch in an Nd:YAG laser cavity is performed. We fabricate a quasi-continuous-wave (QCW) diode-pumped Nd:YAG laser cavity, which is shortened to 10 mm in length and which contains an RIG film and a pair of small coils. This cavity yields a 1,064.58-nm-wavelength pulse with 25-ns duration and 1...
November 13, 2017: Scientific Reports
https://www.readbyqxmd.com/read/29131369/photobiomodulation-for-traumatic-brain-injury-and-stroke
#7
REVIEW
Michael R Hamblin
There is a notable lack of therapeutic alternatives for what is fast becoming a global epidemic of traumatic brain injury (TBI). Photobiomodulation (PBM) employs red or near-infrared (NIR) light (600-1100nm) to stimulate healing, protect tissue from dying, increase mitochondrial function, improve blood flow, and tissue oxygenation. PBM can also act to reduce swelling, increase antioxidants, decrease inflammation, protect against apoptosis, and modulate microglial activation state. All these mechanisms of action strongly suggest that PBM delivered to the head should be beneficial in cases of both acute and chronic TBI...
November 13, 2017: Journal of Neuroscience Research
https://www.readbyqxmd.com/read/29131193/frequency-and-timing-stability-of-an-airborne-injection-seeded-nd-yag-laser-system-for-direct-detection-wind-lidar
#8
Christian Lemmerz, Oliver Lux, Oliver Reitebuch, Benjamin Witschas, Christian Wührer
We report on the design and performance of the laser deployed in the airborne demonstrator Doppler wind lidar for the Aeolus mission of the European Space Agency (ESA). The all-solid-state, diode-pumped and frequency-tripled Nd:YAG laser is realized as a master oscillator power amplifier (MOPA) system, generating 60 mJ of single-frequency pulses at 355 nm wavelength, 50 Hz repetition rate and 20 ns pulse duration. For the measurement of the Doppler frequency shift over several accumulated laser shots, the frequency stability of the laser is of crucial importance...
November 10, 2017: Applied Optics
https://www.readbyqxmd.com/read/29125929/effects-of-low-level-laser-therapy-with-a-herbal-extract-on-alveolar-bone-healing
#9
Anıl Özyurt, Çiğdem Elmas, Cemile Merve Seymen, Veysel Tuncay Peker, Bülent Altunkaynak, Mehmet Nadir Güngör
PURPOSE: This study investigated the effect of a gallium, aluminum, and arsenide (GaAlAs) diode laser used in low-level laser therapy (LLLT) with the application of Mecsina Hemostopper on mandibular alveolar bone healing. MATERIALS AND METHODS: Standard semispherical bone defects were created in left mandibular diastema sites of 32 female Long-Evans rats. Experimental animals were allocated to 1 of 4 groups: control group (no treatment), laser group (GaAlAs LLLT), Mecsina group, and laser-Mecsina combination group...
October 16, 2017: Journal of Oral and Maxillofacial Surgery
https://www.readbyqxmd.com/read/29123637/diode-laser-assisted-excision-and-low-level-laser-therapy-in-the-management-of-mucus-extravasation-cysts-a-case-series
#10
Abdul Ahad, Shruti Tandon, Arundeep Kaur Lamba, Farrukh Faraz, Parimal Anand, Abdul Aleem
Introduction: Mucus extravasation cyst is a commonly occurring lesion in oral cavity that may result from traumatic severance of a salivary gland duct with subsequent extravasation of mucus into fibrous connective tissue. After a conventional excision or marsupialization, recurrence is not uncommon. Diode laser offers an effective modality for management of such lesions. Case Reports: Four patients were referred with painless fluctuant swellings on labial and buccal mucosa. After recording history and clinical examination, provisional diagnosis of mucocele was made...
2017: Journal of Lasers in Medical Sciences
https://www.readbyqxmd.com/read/29123636/management-of-oral-lichen-planus-by-980-nm-diode-laser
#11
Nahid Derikvand, Seyedeh Sara Ghasemi, Mohammad Moharami, Ehsan Shafiei, Nasim Chiniforush
Introduction: Oral lichen planus (OLP) is a mucocutaneous disease with uncertain etiology. As the etiology is unknown standard treatment modalities are not available. The traditional and common treatment relies on corticosteroids whether topical or systemic. In recent years, development of lasers made a proper path to use this instrument for treatment of the diseases which are refractory to conventional treatments. Previous studies in this field used CO2, ND:YAG, Excimer and some wavelength of diode lasers for the treatment of different types of lichen planus...
2017: Journal of Lasers in Medical Sciences
https://www.readbyqxmd.com/read/29123634/evaluation-of-effectiveness-of-photodynamic-therapy-with-low-level-diode-laser-in-nonsurgical-treatment-of-peri-implantitis
#12
Ehsan Birang, Mohammad Reza Talebi Ardekani, Mahboobeh Rajabzadeh, Gloria Sarmadi, Reza Birang, Norbert Gutknecht
Introduction: Side effects related to antibiotic therapy for peri-implantitis are rare in laser therapy (LT); therefore, the aim of this study was to evaluate the effectiveness of LT and photodynamic therapy (PDT) on patients with primary peri-implantitis. Methods: In this randomized clinical trial, 40 implants presenting primary peri-implantitis in 20 patients with a mean age of 52.6 years old were included using the simple sampling technique. Periodontal treatment comprising scaling and root planing (SRP) was accomplished for the whole mouth while mechanical debridement with titanium curettes and air polishing with sodium bicarbonate powder was accomplished around the implants...
2017: Journal of Lasers in Medical Sciences
https://www.readbyqxmd.com/read/29123633/efficiency-of-a-new-combined-laser-therapy-in-patients-with-trophic-ulcers-of-lower-extremities-and-chronic-venous-insufficiency
#13
Sergey Vladimirovich Moskvin, Aleksandr Vladimirovich Geynitz, Evgeniy Valer'yevich Askhadulin
Introduction: Treating patients with trophic ulcers (TUs) of venous etiology (VE) is a complicated socio-medical and economic problem. One of the ways to increase treatment efficiency can be a complex therapy, including combined laser action. Methods: The objective of this study was a comparative evaluation of the efficiency of traditional treatment methods in patients with chronic venous diseases of C6 class, and combined laser therapy (LT) according to a new method by LASMIK® device. External exposure was conducted on the 1-4 affected area during one session for 2 minutes per zone (pulsed mode, light pulse duration of 100-130 ns, wavelength 635 nm, by a matrix emitter consisting of eight laser diodes with a surface area of 8 cm2, at a distance of up to 7 cm, pulsed power 40 W)...
2017: Journal of Lasers in Medical Sciences
https://www.readbyqxmd.com/read/29123630/development-of-temperature-distribution-and-light-propagation-model-in-biological-tissue-irradiated-by-980-nm-laser-diode-and-using-comsol-simulation
#14
Kawthar Shurrab, Nabil Kochaji, Wesam Bachir
Introduction: The purpose of this project is to develop a mathematical model to investigate light distribution and study effective parameters such as laser power and irradiated time to get the optimal laser dosage to control hyperthermia. This study is expected to have a positive impact and a better simulation on laser treatment planning of biological tissues. Moreover, it may enable us to replace animal tests with the results of a COMSOL predictive model. Methods: We used in this work COMSOL5 model to simulate the light diffusion and bio-heat equation of the mouse tissue when irradiated by 980 nm laser diode and the effect of different parameters (laser power, and irradiated time) on the surrounding tissue of the tumor treatment in order to prevent damage from excess heat Results: The model was applied to study light propagation and several parameters (laser power, irradiated time) and their impact on light-heat distribution within the tumor in the mouse back tissue The best result is at laser power 0...
2017: Journal of Lasers in Medical Sciences
https://www.readbyqxmd.com/read/29119483/low-level-laser-therapy-for-xerostomia-in-primary-sj%C3%A3-gren-s-syndrome-a-randomized-trial
#15
Tania Fidelix, Adriano Czapkowski, Sergio Azjen, Adagmar Andriolo, Pedro Horvath Neto, Virgínia Trevisani
To evaluate the effectiveness of low-level laser therapy (LLLT) in the treatment of xerostomia in primary Sjögren's syndrome (SS), a randomized clinical trial of patients with dry mouth symptoms associated with primary SS receiving care at a university hospital was conducted. Sixty-six patients were randomly assigned with a 1:1 allocation ratio to receive LLLT (laser group, n = 33) or placebo treatment (placebo group, n = 33). Patients in the laser group received LLLT twice a week for 6 weeks, for a total of 12 treatment sessions...
November 9, 2017: Clinical Rheumatology
https://www.readbyqxmd.com/read/29119418/low-level-laser-therapy-improves-the-vo2-kinetics-in-competitive-cyclists
#16
Fábio J Lanferdini, Renata L Krüger, Bruno M Baroni, Caetano Lazzari, Pedro Figueiredo, Alvaro Reischak-Oliveira, Marco A Vaz
Some evidence supports that low-level laser therapy (LLLT) reduces neuromuscular fatigue, so incrementing sports performance. A previous randomized controlled trial of our group showed increased exercise tolerance in male competitive cyclists treated with three different LLLT doses (3, 6, and 9 J/diode; or 135, 270, and 405 J/thigh) before time-to-exhaustion cycling tests. Now, the present study was designed to evaluate the effects of these LLLT doses on the VO2 kinetics of athletes during cycling tests. Twenty male competitive cyclists (29 years) participated in a crossover, randomized, double-blind, and placebo-controlled trial...
November 9, 2017: Lasers in Medical Science
https://www.readbyqxmd.com/read/29119162/intense-red-up-conversion-luminescence-and-dynamical-processes-observed-in-sc2o3-yb-3-er-3-nanostructures
#17
Junxia Jiu, Xitao An, Jing Li, Jing Leng, Wei Lü, Li Chen, Xiaojun Wang
The intense red up-conversion luminescence in Sc2O3:Yb(3+),Er(3+) synthesized using a biphasic solvothermal (ST) method was observed upon laser diode pumping at 980 nm. Compared with that found in the bulk sample synthesized using a solid state (SS) reaction at the same sintering temperature (700 °C), the green and red up-conversion luminescence are enhanced by a factor of 19.7 and 23.4, respectively. The relative red intensity of the sample prepared using the ST method at 700 °C for 2 h was enhanced up to 6...
November 9, 2017: Dalton Transactions: An International Journal of Inorganic Chemistry
https://www.readbyqxmd.com/read/29115816/reversible-self-assembly-of-3d-architectures-actuated-by-responsive-polymers
#18
Cheng Zhang, Jheng-Wun Su, Heng Deng, Yunchao Xie, Zheng Yan, Jian Lin
Assembly of three-dimensional (3D) architectures with defined configurations has important applications in broad areas. Among various approaches of constructing 3D structures, stress-driven assembly provides the capabilities of creating 3D architectures in a broad range of functional materials with unique merits. However, 3D architectures built via previous methods are either simple, irreversible or not free-standing. Furthermore, the substrates employed for the assembly remain flat, thus not involved as parts of the final 3D architectures...
November 8, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/29112328/low-power-laser-irradiation-decreases-lipid-droplet-accumulation-in-the-parotid-glands-of-diabetic-rats
#19
Juliana Rodrigues de Castro, Eugen Mendes Nesadal de Souza, Yun-Jong Park, Luana de Campos, Seunghee Cha, Victor Elias Arana-Chavez, José Nicolau, Alyne Simões
Lipid droplet accumulation has been related to salivary gland hypofunction in diabetes. In this study, the effect of laser irradiation on the parotid salivary glands (PG) of diabetic rats was analyzed with regard to its effect on lipid droplet accumulation, intracellular calcium concentration and calmodulin expression. The animals were distributed into 6 groups: D0, D5, D20 and C0, C5, C20, for diabetic (D) and control animals (C), respectively. Twenty-nine days following diabetes induction, PG of groups D5 and C5; D20 and C20 were irradiated with 5 and 20 J/cm(2) of a red diode laser at 100 mW, respectively...
November 7, 2017: Journal of Biophotonics
https://www.readbyqxmd.com/read/29111750/self-catalyzed-vapor-liquid-solid-growth-of-lead-halide-nanowires-and-conversion-to-hybrid-perovskites
#20
Jonathan K Meyers, Seokhyoung Kim, David J Hill, Emma E M Cating, Lenzi J Williams, Amar S Kumbhar, James R McBride, John M Papanikolas, James F Cahoon
Lead halide perovskites (LHPs) have shown remarkable promise for use in photovoltaics, photodetectors, light-emitting diodes, and lasers. Although solution-processed polycrystalline films are the most widely studied morphology, LHP nanowires (NWs) grown by vapor-phase processes offer the potential for precise control over crystallinity, phase, composition, and morphology. Here, we report the first demonstration of self-catalyzed vapor-liquid-solid (VLS) growth of lead halide (PbX2; X = Cl, Br, or I) NWs and conversion to LHP...
November 13, 2017: Nano Letters
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