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https://www.readbyqxmd.com/read/29333627/saturable-absorption-in-2d-ti3-c2-mxene-thin-films-for-passive-photonic-diodes
#1
Yongchang Dong, Sergii Chertopalov, Kathleen Maleski, Babak Anasori, Longyu Hu, Sriparna Bhattacharya, Apparao M Rao, Yury Gogotsi, Vadym N Mochalin, Ramakrishna Podila
MXenes comprise a new class of 2D transition metal carbides, nitrides, and carbonitrides that exhibit unique light-matter interactions. Recently, 2D Ti3 CNTx (Tx represents functional groups such as OH and F) was found to exhibit nonlinear saturable absorption (SA) or increased transmittance at higher light fluences, which is useful for mode locking in fiber-based femtosecond lasers. However, the fundamental origin and thickness dependence of SA behavior in MXenes remain to be understood. 2D Ti3 C2 Tx thin films of different thicknesses are fabricated using an interfacial film formation technique to systematically study their nonlinear optical properties...
January 15, 2018: Advanced Materials
https://www.readbyqxmd.com/read/29329120/re-osseointegration-of-dental-implants-after-periimplantitis-treatments-a-systematic-review
#2
Marwa Madi, Moe Htet, Osama Zakaria, Adel Alagl, Shohei Kasugai
PURPOSE: This review considers possible surgical treatment modalities for induced periimplantitis to regain re-osseointegration as reported in the recent literature. MATERIALS AND METHODS: Electronic searches in MEDLINE/PubMed and Google Scholar databases were performed on experimental studies considering induced periimplantitis and attempts to achieve re-osseointegration from 2003 up to December 2016. Conflicts about articles were solved by authors' discussion...
January 11, 2018: Implant Dentistry
https://www.readbyqxmd.com/read/29328325/comparing-laser-induced-plasmas-formed-in-diode-and-excimer-pumped-alkali-lasers
#3
Aram H Markosyan
Lasing on the D1 transition (62P1/2 → 62S1/2) of cesium can be reached in both diode and excimer pumped alkali lasers. The first uses D2 transition (62S1/2 → 62P3/2) for pumping, whereas the second is pumped by photoexcitation of ground state Cs-Ar collisional pairs and subsequent dissociation of diatomic, electronically-excited CsAr molecules (excimers). Despite lasing on the same D1 transition, differences in pumping schemes enables chemical pathways and characteristic timescales unique for each system...
January 8, 2018: Optics Express
https://www.readbyqxmd.com/read/29328318/efficient-continuous-wave-and-passively-q-switched-pulse-laser-operations-in-a-diffusion-bonded-sapphire-er-yb-yal3-bo3-4-sapphire-composite-crystal-around-1-55-%C3%AE-m
#4
Yujin Chen, Yanfu Lin, Jianhua Huang, Xinghong Gong, Zundu Luo, Yidong Huang
A composite crystal consisting of a 1.5-mm-thick Er:Yb:YAl3(BO3)4 crystal between two 1.2-mm-thick sapphire crystals was fabricated by the thermal diffusion bonding technique. Compared with a lone Er:Yb:YAl3(BO3)4 crystal measured under the identical experimental conditions, higher laser performances were demonstrated in the sapphire/Er:Yb:YAl3(BO3)4/sapphire composite crystal due to the reduction of the thermal effects. End-pumped by a 976 nm laser diode in a hemispherical cavity, a 1.55 μm continuous-wave laser with a maximum output power of 1...
January 8, 2018: Optics Express
https://www.readbyqxmd.com/read/29328277/efficient-1-7%C3%A2-%C3%A2-%C3%AE-m-light-source-based-on-kta-opo-derived-by-nd-yvo4-self-raman-laser
#5
Haiyong Zhu, Junhong Guo, Yanmin Duan, Jing Zhang, Yongchang Zhang, Changwen Xu, Hongyan Wang, Dianyuan Fan
An intra-cavity optical parametric oscillator (OPO) emitting at 1.7 μm derived by Nd:YVO4 self-Raman laser is demonstrated in this Letter, with a KTiOAsO4 (KTA) crystal used as nonlinear optical crystal. A laser diode end-pumped acousto-optic Q-switched Nd:YVO4 self-Raman laser at 1176 nm was employed as the pump source. At an incident pump power of 12.1 W and a pulse repetition frequency of 60 kHz, average output power up to 1.2 W signal light at 1742 nm was obtained, with diode-to-signal conversion efficiency of 10%...
January 15, 2018: Optics Letters
https://www.readbyqxmd.com/read/29328242/efficient-diode-pumped-er-klu-wo4-2-laser-at-%C3%A2-1-61%C3%A2-%C3%A2-%C3%AE-m
#6
Josep Maria Serres, Pavel Loiko, Venkatesan Jambunathan, Xavier Mateos, Vladimir Vitkin, Antonio Lucianetti, Tomas Mocek, Magdalena Aguiló, Francesc Díaz, Uwe Griebner, Valentin Petrov
We report on an efficient diode-pumped continuous-wave erbium-doped monoclinic double tungstate laser. It is based on a 1 at. % Er3+:KLu(WO4)2 (Er:KLuW) crystal cut along the Ng optical indicatrix axis. The Er:KLuW microchip laser, diode pumped at 0.98 μm, generates 268 mW at 1.610 μm with a slope efficiency of 30%. The output is linearly polarized (E||Nm), and the laser beam is nearly diffraction limited (Mp,m2<1.1). Spectroscopic properties of Er3+ in KLuW are also presented. The stimulated-emission cross-section σSE is 0...
January 15, 2018: Optics Letters
https://www.readbyqxmd.com/read/29328230/high-efficiency-2%C3%A2-%C3%A2-%C3%AE-m-tm-yap-laser-with-a-compact-mechanical-q-switch
#7
Brian Cole, Lew Goldberg, A D Hays
We describe a compact, highly efficient, diode-pumped, mechanically Q-switched Tm:YAP laser operating near 2 μm. The Q-switch, based on a torsion spring resonant mirror scanner, had negligible optical loss and required very low electrical drive power. At a 10 kHz pulse repetition frequency, the laser generated an average output power of 10.5 W at 1.94 μm, Q-switched pulse energy of 1.05 mJ, a pulse length of 31 ns, and a peak power of 34 kW. The Q-switched laser exhibited maximum optical and electrical efficiencies of 51% and 26%, respectively...
January 15, 2018: Optics Letters
https://www.readbyqxmd.com/read/29328213/iodine-stabilized-single-frequency-green-ingan-diode-laser
#8
Yi-Hsi Chen, Wei-Chen Lin, Jow-Tsong Shy, Hsiang-Chen Chui
A 520-nm InGaN diode laser can emit a milliwatt-level, single-frequency laser beam when the applied current slightly exceeds the lasing threshold. The laser frequency was less sensitive to diode temperature and could be finely tuned by adjusting the applied current. Laser frequency was stabilized onto a hyperfine component in an iodine transition through the saturated absorption spectroscopy. The uncertainty of frequency stabilization was approximately 8×10-9 at a 10-s integration time. This compact laser system can replace the conventional green diode-pumped solid-state laser and applied as a frequency reference...
January 1, 2018: Optics Letters
https://www.readbyqxmd.com/read/29328173/random-fiber-laser-based-on-artificially-controlled-backscattering-fibers
#9
Xiaoliang Wang, Daru Chen, Haitao Li, Lijuan She, Qiong Wu
The random fiber laser (RFL), which is a milestone in laser physics and nonlinear optics, has attracted considerable attention recently. Most previously reported RFLs are based on distributed feedback of Rayleigh scattering amplified through the stimulated Raman-Brillouin scattering effect in single-mode fibers, which require long-distance (tens of kilometers) single-mode fibers and high threshold, up to watt level, due to the extremely small Rayleigh scattering coefficient of the fiber. We proposed and demonstrated a half-open-cavity RFL based on a segment of an artificially controlled backscattering single-mode fiber with a length of 210 m, 310 m, or 390 m...
January 10, 2018: Applied Optics
https://www.readbyqxmd.com/read/29326812/endovascular-laser-treatment-of-incompetent-saphenous-veins-using-the-1470%C3%A2-nm-diode-laser-and-radial-fiber
#10
Georgios Vourliotakis, Georgios Sahsamanis, Paschalis Evagelidis, Christina Aivatidi
Objectives: To assess the technical success, complications, and patients' quality of life (QoL) after treatment of chronic venous disease (CVD) using the 1470 nm radial fiber laser. Methods: A total of 170 patients with chronic venous disease, classified as C2 to C4 according to CEAP classification, were treated for incompetent greater (GSV) and small (SSV) saphenous veins, using the 1470 nm radial fiber laser and application of tumescent anesthesia. Additional phlebectomies were performed through stab microincisions, while 11 patients further underwent sclerotherapy intraoperatively...
January 2018: Annals of Medicine and Surgery
https://www.readbyqxmd.com/read/29324421/analysis-on-the-effect-of-sensor-views-in-image-reconstruction-produced-by-optical-tomography-system-using-charge-coupled-device
#11
Juliza Jamaludin, Ruzairi Abdul Rahim, Mohd Hafiz Fazul Rahiman, Jemmy Mohd Rohani
Optical tomography (OPT) is a method to capture a cross-sectional image based on the data obtained by sensors, distributed around the periphery of the analyzed system. This system is based on the measurement of the final light attenuation or absorption of radiation after crossing the measured objects. The number of sensor views will affect the results of image reconstruction, where the high number of sensor views per projection will give a high image quality. This research presents an application of charge-coupled device linear sensor and laser diode in an OPT system...
April 2018: IEEE Transactions on Image Processing: a Publication of the IEEE Signal Processing Society
https://www.readbyqxmd.com/read/29322853/laser-ablation-of-the-biliary-tree-in-vivo-proof-of-concept-as-potential-treatment-of-unresectable-cholangiocarcinoma
#12
Paola Saccomandi, Giuseppe Quero, Riccardo Gassino, Alfonso Lapergola, Ludovica Guerriero, Michele Diana, Alberto Vallan, Guido Perrone, Emiliano Schena, Guido Costamagna, Jaques Marescaux, Francesco M Di Matteo
OBJECTIVES: The palliative treatment of cholangiocarcinoma is based on stent placement with well-known procedure-related complications. Consequently, alternative energy-based techniques were put forward with controversial long-term results. This study aims to evaluate the safety and effectiveness of biliary tree laser ablation (LA) in terms of: i) absence of perforation, ii) temperature increase, iii) induced thermal damage in in vivo models. MATERIALS AND METHODS: The common bile duct and cystic ducts of two pigs were ablated with a diode laser (circumferential irradiation pattern) for 6 and 3 minutes at 7 W...
January 11, 2018: International Journal of Hyperthermia
https://www.readbyqxmd.com/read/29322402/laser-treatment-of-primary-axillary-hyperhidrosis-a-review-of-the-literature
#13
Jessica Cervantes, Marina Perper, Ariel E Eber, Raymond M Fertig, John P Tsatalis, Keyvan Nouri
Hyperhidrosis o`ccurs when the body produces sweat beyond what is essential to maintain thermal homeostasis. The condition tends to occur in areas marked by high-eccrine density such as the axillae, palms, and soles and less commonly in the craniofacial area. The current standard of care is topical aluminum chloride hexahydrate antiperspirant (10-20%), but other treatments such as anticholinergics, clonidine, propranolol, antiadrenergics, injections with attenuated botulinum toxin, microwave technology, and surgery have been therapeutically implicated as well...
January 11, 2018: Lasers in Medical Science
https://www.readbyqxmd.com/read/29320595/safety-and-efficacy-of-a-non-invasive-1060-nm-diode-laser-for-fat-reduction-of-the-abdomen
#14
Lawrence S Bass, Sean T Doherty
BACKGROUND: Changes in temperature are known to produce apoptosis in adipocytes. This study examines the use of a non-invasive treatment that applies 1060 nm laser energy transcutaneously to hyperthermically induce disruption of fat cells in the abdomen. METHODS: Thirty-five subjects received application of 1060 nm laser on the abdomen for fat reduction. Ultrasound images and high-resolution two-dimensional photography were recorded at baseline, 6 weeks, and 12 weeks post treatment...
January 1, 2018: Journal of Drugs in Dermatology: JDD
https://www.readbyqxmd.com/read/29320434/small-imaging-depth-lidar-and-dcnn-based-localization-for-automated-guided-vehicle
#15
Seigo Ito, Shigeyoshi Hiratsuka, Mitsuhiko Ohta, Hiroyuki Matsubara, Masaru Ogawa
We present our third prototype sensor and a localization method for Automated Guided Vehicles (AGVs), for which small imaging LIght Detection and Ranging (LIDAR) and fusion-based localization are fundamentally important. Our small imaging LIDAR, named the Single-Photon Avalanche Diode (SPAD) LIDAR, uses a time-of-flight method and SPAD arrays. A SPAD is a highly sensitive photodetector capable of detecting at the single-photon level, and the SPAD LIDAR has two SPAD arrays on the same chip for detection of laser light and environmental light...
January 10, 2018: Sensors
https://www.readbyqxmd.com/read/29315842/high-performance-single-crystalline-perovskite-thin-film-photodetector
#16
Zhenqian Yang, Yuhao Deng, Xiaowei Zhang, Suo Wang, Huazhou Chen, Sui Yang, Jacob Khurgin, Nicholas X Fang, Xiang Zhang, Renmin Ma
The best performing modern optoelectronic devices rely on single-crystalline thin-film (SC-TF) semiconductors grown epitaxially. The emerging halide perovskites, which can be synthesized via low-cost solution-based methods, have achieved substantial success in various optoelectronic devices including solar cells, lasers, light-emitting diodes, and photodetectors. However, to date, the performance of these perovskite devices based on polycrystalline thin-film active layers lags behind the epitaxially grown semiconductor devices...
January 8, 2018: Advanced Materials
https://www.readbyqxmd.com/read/29315082/chemically-linked-metal-matrix-nanocomposites-of-boron-nitride-nanosheets-and-silver-as-thermal-interface-materials
#17
Nirup Nagabandi, Cengiz Yegin, Xuhui Feng, Charles King, Jun Kyun Oh, Ethan Adam Scholar, Sreekant Narumanchi, Mustafa Akbulut
Herein, novel hybrid nanocomposite thermal interface materials (TIMs) relying on the chemical linkage of silver, boron nitride nanosheets (BNNSs), and organic ligands are reported. These TIMs were prepared using a co-electrodeposition/chemisorption approach where the electrolytic reduction of silver ions into silver nano-/micro-crystals was coupled with the conjugation of ligand-coated nanosheets onto silver crystals. Furthermore, the influence of bond strength of silver/nanosheet links on the thermal, mechanical, and structural properties is investigated using a combination of techniques; including laser flash analysis, phase-sensitive transient thermoreflectance, nanoindentation, and electron microscopy...
January 9, 2018: Nanotechnology
https://www.readbyqxmd.com/read/29304001/microstructure-and-sliding-wear-behaviour-of-in-situ-tic-reinforced-composite-surface-layers-fabricated-on-ductile-cast-iron-by-laser-alloying
#18
Damian Janicki
TiC-reinforced composite surface layers (TRLs) on a ductile cast iron EN-GJS-700-2 grade (DCI) substrate were synthesized using a diode laser surface alloying with a direct injection of titanium powder into the molten pool. The experimental results were compared with thermodynamic calculations. The TRLs having a uniform distribution of the TiC particles and their fraction up to 15.4 vol % were achieved. With increasing titanium concentration in the molten pool, fractions of TiC and retained austenite increase and the shape of TiC particles changes from cubic to dendritic form...
January 5, 2018: Materials
https://www.readbyqxmd.com/read/29302842/effects-of-high-frequency-near-infrared-diode-laser-irradiation-on-the-proliferation-and-migration-of-mouse-calvarial-osteoblasts
#19
Ryo Kunimatsu, Hidemi Gunji, Yuji Tsuka, Yuki Yoshimi, Tetsuya Awada, Keisuke Sumi, Kengo Nakajima, Aya Kimura, Tomoka Hiraki, Takaharu Abe, Hirose Naoto, Makoto Yanoshita, Kotaro Tanimoto
Laser irradiation activates a range of cellular processes and can promote tissue repair. Here, we examined the effects of high-frequency near-infrared (NIR) diode laser irradiation on the proliferation and migration of mouse calvarial osteoblastic cells (MC3T3-E1). MC3T3-E1 cells were cultured and exposed to high-frequency (30 kHz) 910-nm diode laser irradiation at a dose of 0, 1.42, 2.85, 5.7, or 17.1 J/cm2. Cell proliferation was evaluated with BrdU and ATP concentration assays. Cell migration was analyzed by quantitative assessment of wound healing using the Incucyt® ZOOM system...
January 4, 2018: Lasers in Medical Science
https://www.readbyqxmd.com/read/29300310/high-power-dfb-diode-laser-based-co-qepas-sensor-optimization-and-performance
#20
Yufei Ma, Yao Tong, Ying He, Xin Yu, Frank K Tittel
A highly sensitive carbon monoxide (CO) trace gas sensor based on quartz-enhanced photoacoustic spectroscopy (QEPAS) was demonstrated. A high-power distributed feedback (DFB), continuous wave (CW) 2.33 μm diode laser with an 8.8 mW output power was used as the QEPAS excitation source. By optimizing the modulation depth and adding an optimum micro-resonator, compared to a bare quartz tuning fork (QTF), a 10-fold enhancement of the CO-QEPAS signal amplitude was achieved. When water vapor acting as a vibrational transfer catalyst was added to the target gas, the signal was further increased by a factor of ~7...
January 4, 2018: Sensors
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