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https://www.readbyqxmd.com/read/28095561/self-resolving-eruptive-keratoacanthomas-after-full-field-erbium-laser-resurfacing
#1
Eileen L Axibal, Julia D Kreger, Michael E Contreras, Joel L Cohen
Keratoacanthoma (KA) is a subtype of squamous cell carcinoma whose development has been linked to excessive sun exposure, immunosuppression, and trauma. Given the rapidly expanding therapeutic armamentarium for anti-aging modalities in dermatology, reports of KA secondary to invasive cosmetic procedures are on the rise. We present a case of eruptive KAs after full- eld ablative Erbium:YAG 2940 nm laser resurfacing of the face that resolved with minimal intervention. This case demonstrates the potential for a rare yet signi cant laser complication that may warrant discussion during the consenting process...
November 1, 2016: Journal of Drugs in Dermatology: JDD
https://www.readbyqxmd.com/read/28095548/integrated-cooling-vacuum-assisted-non-fractional-1540-nm-erbium-glass-laser-is-effective-in-treating-acne-scars
#2
Yael Politi, Assi Levi, Moshe Lapidoth
INTRODUCTION: Acne scars are a common result of in ammatory acne, affecting many patients worldwide. Among which, atrophic scars are the most prevalent form, presenting as dermal depressions caused by inflammatory degeneration of dermal collagen. Mid-infrared laser skin interaction is characterized by its modest absorption in water and nite penetration to the mid-dermis. Since collagen is a desirable laser target, 1540-nm wavelength is amenable for collagen remodeling within the depressed area of atrophic scars...
November 1, 2016: Journal of Drugs in Dermatology: JDD
https://www.readbyqxmd.com/read/28094408/large-area-tungsten-disulfide-for-ultrafast-photonics
#3
Peiguang Yan, Hao Chen, Jinde Yin, Zihan Xu, Jiarong Li, Zike Jiang, Wenfei Zhang, Jinzhang Wang, Irene Ling Li, Zhipei Sun, Shuangchen Ruan
Two-dimensional (2D) layered transition metal dichalcogenides (TMDs) have attracted significant interest in various optoelectronic applications due to their excellent nonlinear optical properties. One of the most important applications of TMDs is to be employed as an extraordinary optical modulation material (e.g., the saturable absorber (SA)) in ultrafast photonics. The main challenge arises while embedding TMDs into fiber laser systems to generate ultrafast pulse trains and thus constraints their practical applications...
January 17, 2017: Nanoscale
https://www.readbyqxmd.com/read/28061356/clinical-differences-in-autofluorescence-between-viable-and-nonvital-bone-a-case-report-with-histopathologic-evaluation-performed-on-medication-related-osteonecrosis-of-the-jaws
#4
Ilaria Giovannacci, Marco Meleti, Domenico Corradi, Paolo Vescovi
Medication-related osteonecrosis of the jaws (MRONJ) is an adverse side effect of several drug therapies, including bisphosphonates (BPs). Osteonecrosis of the jaw specifically related to BP therapy is usually referred to using the acronym BRONJ. However, no consensus has yet been reached regarding the most appropriate management of BRONJ. The greatest success rates have been recorded with surgical removal of necrotic bone. In particular, erbium:yttrium-aluminum-garnet (Er:YAG) laser-assisted surgery has shown significantly better results than conventional surgical approaches...
December 15, 2016: Journal of Oral and Maxillofacial Surgery
https://www.readbyqxmd.com/read/28032173/clinical-outcomes-and-complications-associated-with-fractional-lasers-a-review-of-730-patients
#5
Steven R Cohen, Ashley Goodacre, Soobin Lim, Jennifer Johnston, Cory Henssler, Brian Jeffers, Ahmad Saad, Tracy Leong
BACKGROUND: Fractional lasers were introduced to provide increased safety, while maintaining high efficacy and patient satisfaction. Patients with virtually all Fitzpatrick skin types could be safely treated using a wide spectrum of wavelengths and a broad array of skin conditions, and aging could be addressed. Although safety studies have been reported for ablative CO2 and erbium lasers, surprisingly few data are available on adverse events and complications associated with fractional lasers...
December 28, 2016: Aesthetic Plastic Surgery
https://www.readbyqxmd.com/read/28009690/fractional-erbium-doped-yttrium-aluminum-garnet-laser-versus-microneedling-in-treatment-of-atrophic-acne-scars-a-randomized-split-face-clinical-study
#6
Mai Abdel Raouf Osman, Hisham Ali Shokeir, Marwa M Fawzy
BACKGROUND: Ablative fractional erbium-doped yttrium aluminum garnet (Er:YAG) laser and microneedling have been popularized in recent years and their effectiveness and side effects individually reported. No previous study, however, has directly compared the efficacy and safety between the 2 different treatments. OBJECTIVE: To compare the efficacy and safety of the ablative fractional Er:YAG laser and microneedling for the treatment of atrophic acne scars. MATERIALS AND METHODS: Thirty patients with atrophic acne scars were randomly treated in a split-face manner with a fractional Er:YAG laser on one side and microneedling on the other side...
January 2017: Dermatologic Surgery: Official Publication for American Society for Dermatologic Surgery [et Al.]
https://www.readbyqxmd.com/read/28005871/vector-self-pulsing-in-erbium-doped-fiber-lasers
#7
Sergey V Sergeyev
Insight into instabilities of fiber laser regimes leading to complex self-pulsing operations is an opportunity to unlock the high power and dynamic operation tunability of lasers. Though many models have been suggested, there is no complete covering of self-pulsing complexity observed experimentally. Here, I further generalized our previous vector model of erbium-doped fiber laser and, for the first time, to the best of my knowledge, map tunability of complex vector self-pulsing on Poincare sphere (limit cycles and double scroll polarization attractors) for laser parameters, e...
October 15, 2016: Optics Letters
https://www.readbyqxmd.com/read/28005867/ultrafast-laser-plasma-doping-of-er-sup-3-sup-ions-in-silica-on-silicon-for-optical-waveguiding-applications
#8
Suraya Ahmad Kamil, Jayakrishnan Chandrappan, Matthew Murray, Paul Steenson, Thomas F Krauss, Gin Jose
An ultrafast laser plasma doping (ULPD) technique is used for high concentration doping of erbium ions into silica-on-silicon substrate. The method uses a femtosecond laser to ablate material from TeO<sub>2</sub>-ZnO-Na<sub>2</sub>O-Er<sub>2</sub>O<sub>3</sub> (Er-TZN) target glass. The laser-generated plasma modifies the silica network, producing a high-index-contrast optical layer suited to the production of on-chip integrated optical circuits. Cross-sectional analysis using scanning electron microscope with energy dispersive x-ray spectroscopy revealed homogeneous intermixing of the host silica with Er-TZN, which is unique to ULPD...
October 15, 2016: Optics Letters
https://www.readbyqxmd.com/read/27998364/bone-healing-following-different-types-of-osteotomy-scanning-electron-microscopy-sem-and-three-dimensional-sem-analyses
#9
Marko Blaskovic, Dragana Gabrić, Nichola J Coleman, Ian J Slipper, Mitko Mladenov, Elizabeta Gjorgievska
The aim of the present study was to compare dynamics of the bone healing process after different types of osteotomies. In total, 24 Wistar rats were subjected to different types of osteotomy performed with standard steel bur, piezosurgery, contact, and non-contact Erbium:yttrium-aluminum-garnet (Er:YAG) laser ablation. The animals were randomly divided into four groups, to be euthanized immediately after the procedure, or at 1, 2, or 3 weeks after surgery. The obtained bone samples were analyzed by scanning electron microscopy (SEM)...
December 2016: Microscopy and Microanalysis
https://www.readbyqxmd.com/read/27958567/high-average-power-and-energy-microsecond-pulse-generation-from-an-erbium-doped-fluoride-fiber-mopa-system
#10
Hongyu Luo, Jianfneg Li, Jitao Xie, Bo Zhai, Chen Wei, Yong Liu
We reported a high average power and energy microsecond pulse erbium-doped fluoride fiber MOPA system centered at 2786.8 nm. The master oscillator was a passively Q-switched erbium-doped fluoride fiber laser based on SESAM in a linear cavity. Then a one-stage erbium-doped fluoride fiber amplifier was used to boost its average output power to 4.2 W and pulse energy to 58.87 μJ. The pulse duration and repetition rate were 2.29 µs and 71.73 kHz, respectively. To the best of our knowledge, the achieved average output power and pulse energy are the recorded levels for the passively Q-switched fiber lasers at 3 μm wavelength region...
December 12, 2016: Optics Express
https://www.readbyqxmd.com/read/27958436/optically-stabilized-erbium-fiber-frequency-comb-with-hybrid-mode-locking-and-a-broad-tunable-range-of-repetition-rate
#11
Honglei Yang, Xuejian Wu, Hongyuan Zhang, Shijie Zhao, Lijun Yang, Haoyun Wei, Yan Li
We present an optically stabilized Erbium fiber frequency comb with a broad repetition rate tuning range based on a hybrid mode-locked oscillator. We lock two comb modes to narrow-linewidth reference lasers in turn to investigate the best performance of control loops. The control bandwidth of fast and slow piezoelectric transducers reaches 70 kHz, while that of pump current modulation with phase-lead compensation is extended to 32 kHz, exceeding laser intrinsic response. Eventually, simultaneous lock of both loops is realized to totally phase-stabilize the comb, which will facilitate precision dual-comb spectroscopy, laser ranging, and timing distribution...
December 1, 2016: Applied Optics
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
#12
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/27917938/high-quality-and-large-size-topological-insulator-bi2te3-gold-saturable-absorber-mirror-for-mode-locking-fiber-laser
#13
Hou-Ren Chen, Chih-Ya Tsai, Hsin-Ming Cheng, Kuei-Huei Lin, Po-Hsiu Yen, Chyong-Hua Chen, Wen-Feng Hsieh
A novel high-quality, large-size, reflection-type topological insulator Bi2Te3-Gold (BG) film-based nonlinear optical modulator has been successfully fabricated as a two-dimensional saturable absorber mirror (SAM) by pulsed laser deposition (PLD). This BG-SAM possesses saturation fluence of 108.3 μJ/cm(2), modulation depth (ΔR) of 6.5%, non-saturable loss of 38.4%, high damage threshold above 1.354 mJ/cm(2) and excellent uniformity providing for the generation of passive mode-locked (ML) pulses for erbium-doped fiber lasers (EDFLs) on a large sample area...
December 5, 2016: Scientific Reports
https://www.readbyqxmd.com/read/27906332/rapid-k-space-linear-wavelength-scanning-laser-source-based-on-recirculating-frequency-shifter
#14
Minggui Wan, Lin Wang, Feng Li, Yuan Cao, Xudong Wang, Xinhuan Feng, Bai-Ou Guan, P K A Wai
We propose and successfully demonstrate a k-space linear and self-clocked wavelength scanning fiber laser source based on recirculating frequency shifting (RFS). The RFS is realized with a high speed electro-optic dual parallel Mach-Zehnder modulator operating at the state of carrier suppressed single sideband modulation. A gated short pulse is injected into an amplified RFS loop to generate the wavelength scanning pulse train. We find that the accumulation of in-band amplified spontaneous emission (ASE) noise over multiple scanning periods will saturate the erbium-doped fiber amplifier and impede the amplification to the pulse signal in the RFS loop...
November 28, 2016: Optics Express
https://www.readbyqxmd.com/read/27906292/ultrafast-pulse-generation-in-a-mode-locked-erbium-chip-waveguide-laser
#15
Champak Khurmi, Nicolas Bourbeau Hébert, Wen Qi Zhang, Shahraam Afshar V, George Chen, Jérôme Genest, Tanya M Monro, David G Lancaster
We report mode-locked ~1550 nm output of transform-limited ~180 fs pulses from a large mode-area (diameter ~50 μm) guided-wave erbium fluorozirconate glass laser. The passively mode-locked oscillator generates pulses with 25 nm bandwidth at 156 MHz repetition rate and peak-power of 260 W. Scalability to higher repetition rate is demonstrated by transform-limited 410 fs pulse output at 1.3 GHz. To understand the origins of the broad spectral output, the laser cavity is simulated by using a numerical solution to the Ginzburg-Landau equation...
November 28, 2016: Optics Express
https://www.readbyqxmd.com/read/27885520/the-effect-of-pre-operative-topical-anaesthetic-cream-on-the-ablative-width-and-coagulative-depth-of-ablative-fractional-resurfacing-laser
#16
Preawphan Punyaratabandhu, Rungsima Wanitphakdeedecha, Penvadee Pattanaprichakul, Panitta Sitthinamsuwan, Weeranut Phothong, Sasima Eimpunth, Visnu Lohsiriwat, Woraphong Manuskiatti
Topical anaesthetic cream (TAC) is commonly used as a pre-treatment of ablative fractional resurfacing (AFR) laser. Most of anaesthetic cream contains distilled water as major component. Therefore, pre-operative TAC may interfere the photothermal reaction in the skin treated with fractional carbon-dioxide (FCO2) laser and fractional erbium-doped yttrium aluminium garnet (FEr:YAG) laser. The objective of the study was to compare the ablative width (AW) and coagulative depth (CD) of AFR laser with and without pre-treatment with TAC...
November 24, 2016: Lasers in Medical Science
https://www.readbyqxmd.com/read/27869377/physical-modalities-for-the-treatment-of-rosacea
#17
Maja A Hofmann, Percy Lehmann
Rosacea is characterised by a wide variety of vascular changes. Apart from telangiectasia and erythema, often so-called flushing occurs. These vascular abnormalities can be targeted with specific light and laser devices. In addition to KTP laser, pulsed dye laser (PDL) and Nd:YAG laser, also intense pulsed light devices (IPLs) are used. The described therapeutic effects include the reduction of vascular abnormalities and even improvement of papulopustular changes. While the KTP laser shows very good results in telangiectasia, the dye laser and IPL devices are used preferably in erythema...
December 2016: Journal der Deutschen Dermatologischen Gesellschaft, Journal of the German Society of Dermatology: JDDG
https://www.readbyqxmd.com/read/27869376/physikalische-methoden-zur-behandlung-der-rosazea
#18
Maja A Hofmann, Percy Lehmann
Die Rosazea ist durch vielfältige vaskuläre Veränderungen gekennzeichnet. Neben Teleangiektasien und Erythemen treten häufig auch sogenannte "Flushings" auf. Haupteinsatzgebiete von Licht- und Lasersystemen sind diese vaskulären Veränderungen, wie Erytheme und Teleangiektasien. Neben dem KTP-Laser, dem Farbstofflaser (PDL) und dem Nd:YAG-Laser kommen auch Blitzlampen (IPL) zum Einsatz. Neben der Rückbildung der vaskulären Komponente, ist auch eine Verbesserung der papulopustulösen Komponente beschrieben...
December 2016: Journal der Deutschen Dermatologischen Gesellschaft, Journal of the German Society of Dermatology: JDDG
https://www.readbyqxmd.com/read/27857397/record-power-ultra-broadband-supercontinuum-source-based-on-highly-geo-sub-2-sub-doped-silica-fiber
#19
D Jain, R Sidharthan, P M Moselund, S Yoo, D Ho, O Bang
We demonstrate highly germania doped fibers for mid-infrared supercontinuum generation. Experiments ensure a highest output power of 1.44 W for a broadest spectrum from 700 nm to 3200 nm and 6.4 W for 800 nm to 2700 nm from these fibers, while being pumped by a broadband Erbium-Ytterbium doped fiber based master oscillator power amplifier. The effect of repetition frequency of pump source and length of germania-doped fiber has also been investigated. Further, germania doped fiber has been pumped by conventional supercontinuum source based on silica photonic crystal fiber supercontinuum source...
November 14, 2016: Optics Express
https://www.readbyqxmd.com/read/27857332/vector-soliton-fiber-laser-passively-mode-locked-by-few-layer-black-phosphorus-based-optical-saturable-absorber
#20
Yufeng Song, Si Chen, Qian Zhang, Lei Li, Luming Zhao, Han Zhang, Dingyuan Tang
We report on the optical saturable absorption of few-layer black phosphorus nanoflakes and demonstrate its application for the generation of vector solitons in an erbium-doped fiber laser. By incorporating the black phosphorus nanoflakes-based saturable absorber (SA) into an all-fiber erbium-doped fiber laser cavity, we are able to obtain passive mode-locking operation with soliton pulses down to ~670 fs. The properties and dynamics of the as-generated vector solitons are experimentally investigated. Our results show that BP nanoflakes could be developed as an effective SA for ultrashort pulse fiber lasers, particularly for the generation of vector soliton pulses in fiber lasers...
November 14, 2016: Optics Express
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