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Femtosecond laser

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https://www.readbyqxmd.com/read/28551832/comparison-of-relex-smile-and-prk-in-terms-of-visual-and-refractive-outcomes-for-the-correction-of-low-myopia
#1
Sri Ganesh, Sheetal Brar, Utsav Patel
PURPOSE: To compare the objective and subjective quality of vision after femtosecond laser-assisted small incision lenticule extraction (SMILE) and photorefractive keratectomy (PRK) for low myopia. METHODS: One hundred and twenty eyes from 60 patients (34 females, 26 males) undergoing bilateral correction of low myopia (≤-4 D SE) with either ReLEx SMILE or PRK were included. Visual acuity, contrast sensitivity and higher-order aberrations were recorded preoperatively and compared postoperatively...
May 27, 2017: International Ophthalmology
https://www.readbyqxmd.com/read/28549845/tomographic-analysis-of-anterior-posterior-and-total-corneal-refractive-power-changes-after-femtosecond-laser-assisted-keratotomy
#2
Franziska Löffler, Myriam Böhm, Michael Herzog, Kerstin Petermann, Thomas Kohnen
PURPOSE: To analyze the effect of penetrating femtosecond laser-assisted keratotomy (pFLAK) during laser lens surgery on anterior, posterior corneal astigmatism and total corneal refractive power (TCRP) astigmatism (CAant, CApost, CATCRP) measured with Scheimpflug tomography. DESIGN: Prospective, interventional case series. METHODS: This institutional study included 27 eyes of 23 patients (65 ± 8 years) with low to moderate CATCRP determined with Scheimpflug tomography (Pentacam HR) after penetrating femtosecond laser-assisted keratotomy (pFLAK) and laser lens surgery...
May 23, 2017: American Journal of Ophthalmology
https://www.readbyqxmd.com/read/28546559/mapping-few-femtosecond-slices-of-ultra-relativistic-electron-bunches
#3
Tim Plath, Christoph Lechner, Velizar Miltchev, Philipp Amstutz, Nagitha Ekanayake, Leslie Lamberto Lazzarino, Theophilos Maltezopoulos, Jörn Bödewadt, Tim Laarmann, Jörg Roßbach
Free-electron lasers are unique sources of intense and ultra-short x-ray pulses that led to major scientific breakthroughs across disciplines from matter to materials and life sciences. The essential element of these devices are micrometer-sized electron bunches with high peak currents, low energy spread, and low emittance. Advanced FEL concepts such as seeded amplifiers rely on the capability of analyzing and controlling the electron beam properties with few-femtosecond time resolution. One major challenge is to extract tomographic slice parameters instead of projected electron beam properties...
May 25, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28546151/comparison-of-intraocular-pressure-during-the-application-of-a-liquid-patient-interface-femto-ldv-z8-for-femtosecond-laser-assisted-cataract-surgery-using-two-different-vacuum-levels
#4
Martina Ebner, Siegfried Mariacher, Kai Januschowski, Katrin Boden, Anna-Maria Seuthe, Peter Szurman, Karl Thomas Boden
BACKGROUND: To evaluate intraocular pressure (IOP) using the application of a novel liquid patient interface for femtosecond laser-assisted cataract surgery with the FEMTO LDV Z8. METHODS: IOP was evaluated in enucleated porcine eyes prior, during and after the application of the Femto LDV Z8 liquid patient interface (Ziemer Ophthalmic Systems, Switzerland) using intracameral cannulation (n=20), intravitreal cannulation (n=20), rebound tonometry (n=20) and indentation tonometry (n=20)...
May 25, 2017: British Journal of Ophthalmology
https://www.readbyqxmd.com/read/28544745/fs-laser-ablation-of-teeth-is-temperature-limited-and-provides-information-about-the-ablated-components
#5
Rebeca Ferraz de Menezes, Catherine Malinda Harvey, Marleny Elizabeth Márquez de Martínez Gerbi, Zachary J Smith, Dan Smith, Juan C Ivaldi, Alton Phillips, James W Chan, Sebastian Wachsmann-Hogiu
The goal of this work is to investigate the thermal effects of femtosecond laser (fs-laser) ablation for the removal of carious dental tissue. Additional studies identify different tooth tissues through femtosecond laser induced breakdown spectroscopy (fsLIBS) for the development of a feedback loop that could be utilized during ablation in a clinical setting. Scanning Election Microscope (SEM) images reveal that minimal morphological damages are incurred at repetition rates below the carbonization threshold of each tooth tissue...
May 24, 2017: Journal of Biophotonics
https://www.readbyqxmd.com/read/28540717/imaging-laser-triggered-drug-release-from-gold-nanocages-with-transient-absorption-lifetime-microscopy-talm
#6
Yongkui Xu, Qi Liu, Ruoyu He, Xianchong Miao, Minbiao Ji
Nanoparticles have shown promise in loading and delivering drugs for targeted therapy. Many progresses have been made in the design, synthesis and modification of nanoparticles to fulfill such goals. However, realizing targeted intracellular delivery and controlled release of drugs remain challenging, partly due to the lack of reliable tools to detect the drug releasing process. In this paper, we applied femtosecond laser pulses to trigger the explosion of gold nanocages (AuNCs) and controlled the intracellular release of loaded AlPcS molecules for photodynamic therapy (PDT)...
May 25, 2017: ACS Applied Materials & Interfaces
https://www.readbyqxmd.com/read/28540469/a-3d-microfluidic-perfusion-system-made-from-glass-for-multiparametric-analysis-of-stimulus-secretioncoupling-in-pancreatic-islets
#7
Torben Schulze, Kai Mattern, Eike Früh, Lars Hecht, Ingo Rustenbeck, Andreas Dietzel
Microfluidic perfusion systems (MPS) are well suited to perform multiparametric measurements with small amounts of tissue to function as an Organ on Chip device (OOC). Such microphysiolgical characterization is particularly valuable in research on the stimulus-secretion-coupling of pancreatic islets. Pancreatic islets are fully functional competent mini-organs, which serve as fuel sensors and transduce metabolic activity into rates of hormone secretion. To enable the simultaneous measurement of fluorescence and oxygen consumption we designed a microfluidic perfusion system from borosilicate glass by 3D femtosecond laser ablation...
September 2017: Biomedical Microdevices
https://www.readbyqxmd.com/read/28540082/a-meta-analysis-comparing-postoperative-complications-and-outcomes-of-femtosecond-laser-assisted-cataract-surgery-versus-conventional-phacoemulsification-for-cataract
#8
REVIEW
Zi Ye, Zhaohui Li, Shouzhi He
Objective. This meta-analysis aimed to compare the outcomes and postoperative complications between femtosecond laser-assisted cataract surgery (FLACS) and conventional phacoemulsification cataract surgery (CPCS). Methods. Bibliographic databases, including PubMed, Embase, and Cochrane library, were systematically searched for references on or before September 2015 regarding the outcomes and complications by FLACS or CPCS. Data on corneal endothelial cell loss, uncorrected distance visual acuity (UDVA), corrected distance visual acuity (CDVA), refractive outcomes, and postoperative complications were retrieved...
2017: Journal of Ophthalmology
https://www.readbyqxmd.com/read/28539633/ultrashort-vortex-from-a-gaussian-pulse-an-achromatic-interferometric-approach
#9
Dinesh N Naik, Nabil A Saad, D Narayana Rao, Nirmal K Viswanathan
The more than a century old Sagnac interferometer is put to first of its kind use to generate an achromatic single-charge vortex equivalent to a Laguerre-Gaussian beam possessing orbital angular momentum (OAM). The interference of counter-propagating polychromatic Gaussian beams of beam waist ωλ with correlated linear phase (ϕ 0  ≥ 0.025 λ) and lateral shear (y 0  ≥ 0.05 ωλ) in orthogonal directions is shown to create a vortex phase distribution around the null interference. Using a wavelength-tunable continuous-wave laser the entire range of visible wavelengths is shown to satisfy the condition for vortex generation to achieve a highly stable white-light vortex with excellent propagation integrity...
May 24, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28532941/cataract-surgery-practices-in-the-united-states-veterans-health-administration
#10
Annika G Havnaer, Paul B Greenberg, Glenn C Cockerham, Melissa A Clark, Amy Chomsky
PURPOSE: To describe current cataract surgery practices within the United States Veterans Health Administration (VHA). SETTING: Veterans Health Administration hospitals in the U.S. DESIGN: Retrospective data analysis. METHODS: An initial e-mail containing a link to an anonymous 32-question survey of cataract surgery practices was sent to participants in May 2016. Two reminder e-mails were sent to nonresponders 1 week and 2 weeks after the initial survey was sent; the remaining nonresponders were called twice over a 2-week period...
April 2017: Journal of Cataract and Refractive Surgery
https://www.readbyqxmd.com/read/28532934/effects-of-topical-ketorolac-tromethamine-0-45-on-intraoperative-miosis-and-prostaglandin-e2-release-during-femtosecond-laser-assisted-cataract-surgery
#11
Jong Hwa Jun, Young-Sik Yoo, Sung A Lim, Choun-Ki Joo
PURPOSE: To determine the effects of topical 0.45% ketorolac tromethamine on intraoperative miosis and prostaglandin E2 (PGE2) release during femtosecond laser-assisted cataract surgery. SETTING: Seoul St. Mary's Hospital, Seoul, Korea. DESIGN: Prospective case series. METHODS: The study comprised the following 3 groups: conventional cataract surgery without topical NSAIDs (conventional group); femtosecond laser-assisted cataract surgery with preoperative topical ketorolac tromethamine 0...
April 2017: Journal of Cataract and Refractive Surgery
https://www.readbyqxmd.com/read/28532933/clinical-outcomes-of-femtosecond-laser-assisted-cataract-surgery-versus-conventional-phacoemulsification-surgery-for-hard-nuclear-cataracts
#12
Xinyi Chen, Yinhui Yu, Xiaohui Song, Yanan Zhu, Wei Wang, Ke Yao
PURPOSE: To compare the outcomes between femtosecond laser-assisted cataract surgery (femtosecond group) and conventional phacoemulsification cataract surgery (conventional group) in patients with hard nuclear cataract. SETTING: Eye Center, Second Affiliated Hospital of School of Medicine, Zhejiang University, Hangzhou, China. DESIGN: Prospective consecutive nonrandomized comparative cohort study. METHODS: According to the Emery-Little classification, cataract patients with a grade 4 or 5 hard nuclei were assigned to 1 of the 2 groups...
April 2017: Journal of Cataract and Refractive Surgery
https://www.readbyqxmd.com/read/28532932/intereye-comparison-of-femtosecond-laser-assisted-cataract-surgery-capsulotomy-and-manual-capsulorhexis-edge%C3%A2-strength
#13
Thomas Chan, Ushasree Pattamatta, Mark Butlin, Kerrie Meades, Chandra Bala
PURPOSE: To compare the breaking force required to tear the explanted capsule after femtosecond laser-assisted cataract surgery in the worse eye and manual cataract surgery in the contralateral eye. SETTING: Personaleyes, Sydney, Australia. DESIGN: Prospective nonrandomized case study. METHOD: Patients with bilateral cataract had femtosecond laser-assisted cataract surgery with the Lensx laser in the eye with worse vision and manual cataract surgery in the contralateral eye...
April 2017: Journal of Cataract and Refractive Surgery
https://www.readbyqxmd.com/read/28532925/does-femtosecond-laser-assisted-cataract-surgery-improve-corneal-endothelial-safety-the-debate-and-conundrum
#14
EDITORIAL
David F Chang
No abstract text is available yet for this article.
April 2017: Journal of Cataract and Refractive Surgery
https://www.readbyqxmd.com/read/28529963/high-current-table-top-setup-for-femtosecond-gas-electron-diffraction
#15
Omid Zandi, Kyle J Wilkin, Yanwei Xiong, Martin Centurion
We have constructed an experimental setup for gas phase electron diffraction with femtosecond resolution and a high average beam current. While gas electron diffraction has been successful at determining molecular structures, it has been a challenge to reach femtosecond resolution while maintaining sufficient beam current to retrieve structures with high spatial resolution. The main challenges are the Coulomb force that leads to broadening of the electron pulses and the temporal blurring that results from the velocity mismatch between the laser and electron pulses as they traverse the sample...
July 2017: Structural Dynamics (Melville, N.Y.)
https://www.readbyqxmd.com/read/28526826/high-efficiency-broadband-second-harmonic-generation-in-single-hexagonal-gaas-nanowire
#16
Jing Wang, Ying Yu, Yu-Ming Wei, Shun-Fa Liu, Juntao Li, Zhang-Kai Zhou, Zhi-Chuan Niu, Si-Yuan Yu, Xue-Hua Wang
In this paper, we investigate second harmonic generation in a single hexagonal GaAs nanowire. An excellent frequency converter based on this nanowire excited using a femtosecond laser is demonstrated to operate over a range from 730 nm to 1960 nm, which is wider than previously reported ranges for nanowires in the literature. The converter always operates with a high conversion efficiency of ~10(-5) W(-1) which is ~10(3) times higher than that obtained from the surface of bulk GaAs. This nanoscale nolinear optical converter that simultaneously owns high efficiency and broad bandwidth may open a new way for application in imaging, bio-sensing and on-chip all-optical signal processing operations...
May 19, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28522866/femtosecond-laser-fabrication-of-anatase-tio2-micro-nanostructures-with-chemical-oxidation-and-annealing
#17
Ting Huang, Jinlong Lu, Xin Zhang, Rongshi Xiao, Wuxiong Yang, Qiang Wu
The fabrication of nanoporous anatase TiO2 on a microstructured Ti base is achieved through an innovative hybrid fabrication method involving femtosecond laser ablation coupled with H2O2 oxidation and annealing. The anatase TiO2 micro-nanostructures have superior photocatalytic degradation of methyl orange due to enhanced light harvesting capacity and surface area. The photodegradation efficiency increases by a maximum of 80% compared to the nanoporous anatase TiO2 fabricated through H2O2 oxidation and annealing only (without femtosecond laser ablation)...
May 18, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28513669/the-open-cubane-oxo-oxyl-coupling-mechanism-dominates-photosynthetic-oxygen-evolution-a-comprehensive-dft-investigation-on-o-o-bond-formation-in-the-s4-state
#18
Yu Guo, Hui Li, Lan-Lan He, Dong-Xia Zhao, Li-Dong Gong, Zhong-Zhi Yang
The dioxygen formation mechanism of biological water oxidation in nature has long been the focus of argument; many diverse mechanistic hypotheses have been proposed. Based on a recent breakthrough in the resolution of the electronic and structural properties of the oxygen-evolving complex in the S3 state, our density functional theory (DFT) calculations reveal that the open-cubane oxo-oxyl coupling mechanism, whose substrates preferably originate from W2 and O5 in the S2 state, emerges as the best candidate for O-O bond formation in the S4 state...
May 17, 2017: Physical Chemistry Chemical Physics: PCCP
https://www.readbyqxmd.com/read/28513588/inertial-displacement-of-a-domain-wall-excited-by-ultra-short-circularly-polarized-laser-pulses
#19
T Janda, P E Roy, R M Otxoa, Z Šobáň, A Ramsay, A C Irvine, F Trojanek, M Surýnek, R P Campion, B L Gallagher, P Němec, T Jungwirth, J Wunderlich
Domain wall motion driven by ultra-short laser pulses is a pre-requisite for envisaged low-power spintronics combining storage of information in magnetoelectronic devices with high speed and long distance transmission of information encoded in circularly polarized light. Here we demonstrate the conversion of the circular polarization of incident femtosecond laser pulses into inertial displacement of a domain wall in a ferromagnetic semiconductor. In our study, we combine electrical measurements and magneto-optical imaging of the domain wall displacement with micromagnetic simulations...
May 17, 2017: Nature Communications
https://www.readbyqxmd.com/read/28512572/experimental-strategies-for-imaging-bioparticles-with-femtosecond-hard-x-ray-pulses
#20
Benedikt J Daurer, Kenta Okamoto, Johan Bielecki, Filipe R N C Maia, Kerstin Mühlig, M Marvin Seibert, Max F Hantke, Carl Nettelblad, W Henry Benner, Martin Svenda, Nicuşor Tîmneanu, Tomas Ekeberg, N Duane Loh, Alberto Pietrini, Alessandro Zani, Asawari D Rath, Daniel Westphal, Richard A Kirian, Salah Awel, Max O Wiedorn, Gijs van der Schot, Gunilla H Carlsson, Dirk Hasse, Jonas A Sellberg, Anton Barty, Jakob Andreasson, Sébastien Boutet, Garth Williams, Jason Koglin, Inger Andersson, Janos Hajdu, Daniel S D Larsson
This study explores the capabilities of the Coherent X-ray Imaging Instrument at the Linac Coherent Light Source to image small biological samples. The weak signal from small samples puts a significant demand on the experiment. Aerosolized Omono River virus particles of ∼40 nm in diameter were injected into the submicrometre X-ray focus at a reduced pressure. Diffraction patterns were recorded on two area detectors. The statistical nature of the measurements from many individual particles provided information about the intensity profile of the X-ray beam, phase variations in the wavefront and the size distribution of the injected particles...
May 1, 2017: IUCrJ
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