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https://www.readbyqxmd.com/read/27924844/designing-a-broadband-pump-for-high-quality-micro-lasers-via-modified-net-radiation-method
#1
Sergey Nechayev, Philip D Reusswig, Marc A Baldo, Carmel Rotschild
High-quality micro-lasers are key ingredients in non-linear optics, communication, sensing and low-threshold solar-pumped lasers. However, such micro-lasers exhibit negligible absorption of free-space broadband pump light. Recently, this limitation was lifted by cascade energy transfer, in which the absorption and quality factor are modulated with wavelength, enabling non-resonant pumping of high-quality micro-lasers and solar-pumped laser to operate at record low solar concentration. Here, we present a generic theoretical framework for modeling the absorption, emission and energy transfer of incoherent radiation between cascade sensitizer and laser gain media...
December 7, 2016: Scientific Reports
https://www.readbyqxmd.com/read/27923362/postoperative-occlusion-of-visual-axis-with-fibrous-membrane-in-the-presence-of-anterior-capsular-phimosis-in-a-patient-with-pseudoexfoliation-syndrome-a-case-report
#2
Eung Suk Kim, Moosang Kim, Seung-Jun Lee, Sang Beom Han, Hee Kyung Yang, Joon Young Hyon
BACKGROUND: To report a case of postoperative fibrous membrane formation occluding the visual axis in the presence of anterior capsular phimosis in a patient with pseudoexfoliation syndrome. CASE PRESENTATION: A 79-year-old Asian woman with pseudoexfoliation syndrome underwent uneventful phacoemulsification and implantation of one-piece hydrophilic acrylic square-edged intraocular lens (Cristalens) in the right eye. Two months later, she had blurred vision in the right eye with the best-corrected visual acuity (BCVA) of 20/40...
December 7, 2016: BMC Ophthalmology
https://www.readbyqxmd.com/read/27921170/effect-of-photon-initiated-photoacoustic-streaming-passive-ultrasonic-and-sonic-irrigation-techniques-on-dentinal-tubule-penetration-of-irrigation-solution-a-confocal-microscopic-study
#3
Merve Akcay, Hakan Arslan, Merve Mese, Nazlı Durmus, Ismail Davut Capar
OBJECTIVES: The aim of this in vitro study was to evaluate the efficacy of different irrigation techniques including laser-activated irrigation using an erbium:yttrium-aluminum-garnet (Er:YAG) laser with a novel tip design (photon-induced photoacoustic streaming (PIPS)), Er:YAG laser with Preciso tip, sonic activation, and passive ultrasonic activation on the final irrigation solution penetration into dentinal tubules by using a laser scanning confocal microscope. MATERIAL AND METHODS: In this study, 65 extracted single-rooted human mandibular premolars were instrumented up to size 40 and randomly divided into 5 groups (n = 13) based on the activation technique of the final irrigation solution as follows: conventional irrigation (control group), sonic activation, passive ultrasonic activation, Er:YAG-PIPS tip activation, and Er:YAG-Preciso tip activation...
December 5, 2016: Clinical Oral Investigations
https://www.readbyqxmd.com/read/27920418/endoscopic-treatment-of-bouverets-syndrome-in-an-extremely-elderly-patient-with-holmium-yag-laser
#4
Kao-Chi Chang, Wei-Ming Chen, Kuo-Liang Wei
: Bouveret's syndrome is a rare presentation of duodenal obstruction or gastric outlet obstruction caused by a large gallstone migrating through a cholecystoduodenal or choledochoduodenal fistula. Most patients are elderly and often have underlying comorbidities, complicating surgery. Endoscopic therapy should be used as first-line treatment for these patients who are not good surgical candidates. We report a case of a 98-year-old Chinese female who presented with vomiting for three days...
November 2016: Annals of Saudi Medicine
https://www.readbyqxmd.com/read/27918844/novel-method-for-facial-rejuvenation-using-er-yag-laser-equipped-with-a-spatially-modulated-ablation-module-an-open-prospective-uncontrolled-cohort-study
#5
N V Volkova, L K Glazkova, V V Khomchenko, N S Sadick
Facial aging is a complex biological process that affects the skin and superficial musculoaponeurotic system (SMAS). A new technology (RecoSMA) for skin rejuvenation based on acoustic-interference method using Er:YAG laser (2936 nm) equipped with a special module SMA that targets both the dermis and SMAS was evaluated in an open-label prospective cohort study of 100 female patients treated for facial rejuvenation. Measure of clinical improvement included investigator-rated clinical photography using the Modified Fitzpatrick Wrinkle Scale, and ultrasound measurements in the dermis a week, 30 days and six months post treatment...
December 5, 2016: Journal of Cosmetic and Laser Therapy: Official Publication of the European Society for Laser Dermatology
https://www.readbyqxmd.com/read/27911476/nd-yag-and-pulsed-dye-laser-therapy-in-infantile-hemangiomas-a-retrospective-analysis-of-271-treated-hemangiomas-in-149-children
#6
F Hartmann, A Lockmann, L-L Grönemeyer, H A Haenssle, M Zutt, H von Fintel, I Kühnle, M P Schön, K-M Thoms
BACKGROUND: Infantile hemangiomas (IH) are common benign tumors in infancy. Most IH resolve spontaneously, but some require treatment due to ulceration, functional impairment or cosmetic disfiguration. While systemic propranolol is effective in many cases, laser therapy may be a safe topical alternative. OBJECTIVE: To assess the efficacy of combined Nd:YAG/pulsed dye laser (PDL) or PDL alone for therapy of IH. PATIENTS AND METHODS: 271 IH in 149 infants were treated with combined Nd:YAG/PDL or PDL alone...
December 2, 2016: Journal of the European Academy of Dermatology and Venereology: JEADV
https://www.readbyqxmd.com/read/27911144/comparison-of-pulsed-dye-laser-versus-combined-pulsed-dye-laser-and-nd-yag-laser-in-the-treatment-of-inflammatory-acne-vulgaris
#7
Manal Mohamed Salah El Din, Nevien Ahmed Samy, Amira Eid Salem
BACKGROUND: Both pulsed dye laser and combined 585/1,064-nm (sequential dual-wave-length PDL and Nd:YAG) laser improves inflammatory skin disorders including acne vulgaris. OBJECTIVE: To compare the efficacy of 585 nm pulsed dye laser versus sequential dual-wave-length PDL and Nd:YAG in treatment of acne vulgaris. PATIENTS AND METHOD: Thirty patients complaining of acne vulgaris were treated with a single pass of PDL alone on half of the face and a single pass of combined 585/1064-nm laser on the other half for four treatment sessions at 2 weeks interval, then assessed by the count and severity of the acne lesions & digital camera photographs Results: The study showed that inflammatory acne lesions count was significantly reduced by 82...
December 2, 2016: Journal of Cosmetic and Laser Therapy: Official Publication of the European Society for Laser Dermatology
https://www.readbyqxmd.com/read/27911117/are-lasers-superior-to-lights-in-the-photoepilation-of-fitzpatrick-v-and-vi-skin-types-a-comparison-between-nd-yag-laser-and-intense-pulsed-light
#8
Bibilash Bs, Ravi Kumar Chittoria, Devinder Mohan Thappa, Devi Prasad Mohapatra, Friji M T, Dineshkumar S, Sandhya Pandey
BACKGROUND AND OBJECTIVES: There are no large volume comparative studies available to compare the efficacy of lasers over lights for hair removal in Fitzpatrick V and VI skin types. This study is designed to compare the efficacy of Nd:YAG Laser versus IPL in the darker skin types. STUDY DESIGN/MATERIALS AND METHODS: Thirty nine patients included in Group-1 were treated with Nd:YAG and 31 in group-2 with IPL. Both groups received 5 sessions of treatment. The hair counts were assessed using digital photography and manual counting method before and after treatment and results were analysed...
December 2, 2016: Journal of Cosmetic and Laser Therapy: Official Publication of the European Society for Laser Dermatology
https://www.readbyqxmd.com/read/27911108/comparative-study-of-dual-pulsed-1-064-nm-q-switched-nd-yag-laser-and-single-pulsed-1-064-nm-q-switched-nd-yag-laser-by-using-zebrafish-model-and-prospective-split-face-analysis-of-facial-melasma
#9
Hee Won Jang, Seung Hyun Chun, Hae Chul Park, Hwa Jung Ryu, Il-Hwan Kim
BACKGROUND: Recently dual-pulsed low-fluence 1,064 nm Q-switched Nd:YAG (QSNY) laser has been developed for reducing complication during melasma treatment. OBJECTIVE: Comparison of the efficacy and safety between dual-pulsed mode and single-pulsed mode for the treatment of melasma. MATERIALS AND METHODS: In preclinical study, adult zebrafish were irradiated with dual-pulsed and single-pulsed mode. Changes of melanophore and cell death were assessed...
December 2, 2016: Journal of Cosmetic and Laser Therapy: Official Publication of the European Society for Laser Dermatology
https://www.readbyqxmd.com/read/27910649/upgrades-to-improve-the-usability-reliability-and-spectral-range-of-the-mst-thomson-scattering-diagnostic
#10
S Z Kubala, M T Borchardt, D J Den Hartog, D J Holly, C M Jacobson, L A Morton, W C Young
The Thomson scattering diagnostic on MST records both equilibrium and fluctuating electron temperature with a range capability of 10 eV-5 keV. Standard operation with two modified commercial Nd:YAG lasers allows measurements at rates of 1 kHz-25 kHz. Several subsystems of the diagnostic are being improved. The power supplies for the avalanche photodiode detectors (APDs) that record the scattered light are being replaced to improve usability, reliability, and maintainability. Each of the 144 APDs will have an individual rack mounted switching supply, with bias voltage adjustable to match the APD...
November 2016: Review of Scientific Instruments
https://www.readbyqxmd.com/read/27910553/identification-and-mitigation-of-stray-laser-light-in-the-thomson-scattering-system-on-the-madison-symmetric-torus-mst
#11
C M Jacobson, M T Borchardt, D J Den Hartog, A F Falkowski, L A Morton, M A Thomas
The Thomson scattering diagnostic on the Madison Symmetric Torus (MST) records excessive levels of stray Nd:YAG laser light. Stray light saturates the 1064 nm spectral channel in all polychromators, which prevents absolute electron density measurements via Rayleigh scattering calibration. Furthermore, stray light contaminates adjacent spectral channels for r/a ≥ 0.75, which renders the diagnostic unable to make electron temperature measurements at these radii. In situ measurements of stray light levels during a vacuum vessel vent are used to identify stray light sources and strategies for reduction of stray light levels...
November 2016: Review of Scientific Instruments
https://www.readbyqxmd.com/read/27910540/the-thomson-scattering-system-at-wendelstein-7-x
#12
E Pasch, M N A Beurskens, S A Bozhenkov, G Fuchert, J Knauer, R C Wolf
This paper describes the design of the Thomson scattering system at the Wendelstein 7-X stellarator. For the first operation campaign we installed a 10 spatial channel system to cover a radial half profile of the plasma cross section. The start-up system is based on one Nd:YAG laser with 10 Hz repetition frequency, one observation optics, five fiber bundles with one delay line each, and five interference filter polychromators with five spectral channels and silicon avalanche diodes as detectors. High dynamic range analog to digital converters with 14 bit, 1 GS/s are used to digitize the signals...
November 2016: Review of Scientific Instruments
https://www.readbyqxmd.com/read/27910519/design-of-thomson-scattering-diagnostic-system-on-j-text
#13
Yinan Zhou, Li Gao, Jiefeng Huang, Qingshuang Qiu, Ge Zhuang
An infrared multi-channel Thomson scattering diagnostic system is designed from the viewpoint of development of the proposed system on the Joint Texas Experimental Tokamak (J-TEXT). A 3 J/50 Hz Nd:YAG laser, which is injected vertically into plasma in the direction from top to bottom, serves as the power source of the system. The scattering light is then collected horizontally and is transmitted to an interference-filter avalanche photodiode based polychromater for spectrum analysis. The system covers the half plasma cross section, providing 14 spatial points with 2 cm resolution...
November 2016: Review of Scientific Instruments
https://www.readbyqxmd.com/read/27910507/the-progress-in-development-of-edge-tangential-thomson-scattering-system-on-hl-2a-tokamak
#14
C H Liu, Y Huang, Y Q Wang, Z Feng, Z P Hou, B Z Fu
The edge tangential Thomson scattering system (ETTSS) was developed for the first time on a HL-2A tokamak. A Nd:YAG laser with a 1064 nm wavelength, 4 J energy, and 30 Hz repetition rate is employed on the ETTSS. The laser beam injects the plasma in the tangential direction on the mid-plane of the machine, and the angles between the laser injection direction and the scattered light collection direction are in the range from 157.5° to 162.8°. The scattered light collection optics with 0.21-0.47 magnification is utilized to collect the scattered light of measurement range from R = 1900 mm to 2100 mm (the normalized radius is from r/a = 0...
November 2016: Review of Scientific Instruments
https://www.readbyqxmd.com/read/27910501/multicharged-carbon-ion-generation-from-laser-plasma
#15
Oguzhan Balki, Hani E Elsayed-Ali
Carbon ions generated by ablation of a carbon target using an Nd:YAG laser pulse (wavelength λ = 1064 nm, pulse width τ = 7 ns, and laser fluence of 10-110 J cm(-2)) are characterized. Time-of-flight analyzer, a three-mesh retarding field analyzer, and an electrostatic ion energy analyzer are used to study the charge and energy of carbon ions generated by laser ablation. The dependencies of the ion signal on the laser fluence, laser focal point position relative to target surface, and the acceleration voltage are described...
November 2016: Review of Scientific Instruments
https://www.readbyqxmd.com/read/27910482/upgraded-divertor-thomson-scattering-system-on-diii-d
#16
F Glass, T N Carlstrom, D Du, A G McLean, D A Taussig, R L Boivin
A design to extend the unique divertor Thomson scattering system on DIII-D to allow measurements of electron temperature and density in high triangularity plasmas is presented. Access to this region is selectable on a shot-by-shot basis by redirecting the laser beam of the existing divertor Thomson system inboard - beneath the lower floor using a moveable, high-damage threshold, in-vacuum mirror - and then redirecting again vertically. The currently measured divertor region remains available with this mirror retracted...
November 2016: Review of Scientific Instruments
https://www.readbyqxmd.com/read/27910362/a-novel-cost-effective-multi-point-thomson-scattering-system-on-the-pegasus-toroidal-experiment-invited
#17
D J Schlossberg, G M Bodner, M W Bongard, R J Fonck, J A Reusch, C Rodriguez Sanchez
A novel, cost-effective, multi-point Thomson scattering system has been designed, implemented, and operated on the Pegasus Toroidal Experiment. Leveraging advances in Nd:YAG lasers, high-efficiency volume phase holographic transmission gratings, and increased quantum-efficiency Generation 3 image-intensified charge coupled device (ICCD) cameras, the system provides Thomson spectra at eight spatial locations for a single grating/camera pair. The on-board digitization of the ICCD camera enables easy modular expansion, evidenced by recent extension from 4 to 12 plasma/background spatial location pairs...
November 2016: Review of Scientific Instruments
https://www.readbyqxmd.com/read/27910326/thomson-scattering-at-general-fusion
#18
W C Young, D Parfeniuk
This paper provides an overview of the Thomson scattering diagnostic in use at General Fusion, including recent upgrades and upcoming plans. The plasma experiment under examination produces temperatures in the 50-500 eV range with density on the order of 10(20) m(-3). A four spatial point collection optics scheme has been implemented, with plans to expand to six spatial points. Recent changes to the optics of the laser beamline have reduced stray light. The system employs a frequency doubled Nd:YAG laser (532 nm), a grating spectrometer, and a photomultiplier array based detector...
November 2016: Review of Scientific Instruments
https://www.readbyqxmd.com/read/27906403/printable-ink-lenses-diffusers-and-2d-gratings
#19
Rajib Ahmed, Ali K Yetisen, Anthony El Khoury, Haider Butt
Advances in holography have led to applications including data storage, displays, security labels, and colorimetric sensors. However, existing top-down approaches for the fabrication of holographic devices are complex, expensive, and expertise dependent, limiting their use in practical applications. Here, ink-based holographic devices have been created for a wide range of applications in diffraction optics. A single pulse of a 3.5 ns Nd:YAG laser allowed selective ablation of ink to nanofabricate planar optical devices...
December 1, 2016: Nanoscale
https://www.readbyqxmd.com/read/27906348/single-frequency-injection-seeded-q-switched-ho-yag-ceramic-laser-pumped-by-a-1-91%C3%AE-m-fiber-coupled-ld
#20
Yixuan Zhang, Chunqing Gao, Qing Wang, Quanxin Na, Meng Zhang, Qing Ye, Mingwei Gao, Jian Zhang
A 2090 nm injection-seeded Q-switched Ho:YAG ceramic laser pumped by a 1.91 μm fiber-coupled LD is demonstrated in this paper. Single-frequency operation of Q-switched Ho:YAG ceramic laser is achieved by injection seeding technique. The maximum output energy of the single-frequency Q-switched Ho:YAG ceramic laser is 14.76 mJ, with a pulse width of 121.6 ns and a repetition rate of 200 Hz. The half-width of the pulse spectrum measured by heterodyne technique is 3.84 MHz. The fluctuation of the center frequency of the pulsed laser is 1...
November 28, 2016: Optics Express
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