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https://www.readbyqxmd.com/read/29160227/enhanced-green-upconversion-luminescence-in-zno-er3-yb3-on-mo6-co-doping-for-temperature-sensor-application
#1
R Anjana, Subha P P, Kurias K Markose, Madambi K Jayaraj
Erbium (Er) doped zinc oxide (ZnO) powder was prepared using co-precipitation method. Effect of ytterbium (Yb) and molybdenum (Mo) co-doping on upconversion emission was studied. The emission intensity has been enhanced on Yb co-doping due to energy transfer from Yb to Er. Co-doping Mo in ZnO:Er, Yb has brought a significant enhancement in green upconversion emission, when excited with 980 nm laser. The enhancement in green emission on Mo doping is because of the formation of Yb3+-MoO42- dimer. Since ZnO is a material having high thermal stability the enhanced green emission in Mo, Er, Yb doped ZnO can be used for temperature sensor applications...
November 21, 2017: Methods and Applications in Fluorescence
https://www.readbyqxmd.com/read/29152831/laser-treatment-of-cutaneous-angiokeratomas-a-systematic-review
#2
REVIEW
Jannett Nguyen, Lance W Chapman, Dorota Z Korta, Christopher B Zachary
Angiokeratomas can present therapeutic challenges, especially in cases of extensive lesions, where traditional surgical methods carry high risks of scarring and hemorrhage. Argon, pulsed dye (PDL), neodymium-doped yttrium aluminum garnet (Nd:YAG), copper vapor, potassium titanyl phosphate, carbon dioxide, and erbium-doped yttrium aluminum garnet (Er:YAG) lasers have emerged as alternative options. To review the use and efficacy of lasers in treating angiokeratomas. A PubMed search identified randomized clinical trials, cohort studies, case series, and case reports involving laser treatment of cutaneous angiokeratomas...
November 19, 2017: Dermatologic Therapy
https://www.readbyqxmd.com/read/29140866/one-thousand-five-hundred-fifty-nanometer-erbium-doped-nonablative-fractional-laser-for-the-treatment-of-striae-distensae-in-patients-of-skin-of-color-fitzpatrick-skin-types-iv-vi
#3
Kelly K Park, Erin Roberts, Rebecca C Tung
No abstract text is available yet for this article.
November 14, 2017: Dermatologic Surgery: Official Publication for American Society for Dermatologic Surgery [et Al.]
https://www.readbyqxmd.com/read/29140340/response-of-an-erbium-doped-dual-polarization-fiber-laser-to-a-perpendicular-gradient-magnetic-field
#4
Tianfang Zhang, Jun Zhang, Linghao Cheng, Yizhi Liang, Long Jin, Hao Liang, Bai-Ou Guan
Direct interaction between fiber lasers and a magnetic field is useful but seldom explored because fiber is known as magnetic field insensitive. In this Letter, the response of an erbium-doped dual-polarization fiber laser to a perpendicular gradient magnetic field is investigated. Measured as beat note frequency change, significant response greater than 500 MHz has been observed that is within theoretical expectation, and translates to a birefringence change of about 4×10(-6) and a potentially very high response to a magnetic field of about 12...
November 15, 2017: Optics Letters
https://www.readbyqxmd.com/read/29133969/treatment-of-chronic-lower-extremity-ulcers-with-a-new-er-yag-laser-technology
#5
J M Alcolea, E Hernández, P A Martínez-Carpio, M Vélez, V Khomchenko, A Sola, M A Trelles
Chronic lower extremity ulcers (CLEUs) have a high prevalence and are difficult to treat due to their various aetiologies. The aim of this study is to evaluate the results achieved in treating CLEUs using an Erbium: YAG (Er:YAG) laser with RecoSMA technology. This laser emits thousands of microbeams of energy causing superficial epidermal ablation and a separation of dermal fibres due to a mechanical-acoustic and resonance effect. The evaluation of the results achieved was carried out by questionnaires completed by 18 patients enrolled in the study...
September 30, 2017: Laser Therapy
https://www.readbyqxmd.com/read/29099682/er-cr-ysgg-laser-energy-delivery-pulse-and-power-effects-on-enamel-surface-and-erosive-resistance
#6
Renan Mota de Oliveira, Vinicius Matsuzaki de Souza, Camila Machado Esteves, Ynara Bosco de Oliveira Lima-Arsati, Alessandra Cassoni, José Augusto Rodrigues, Aldo Brugnera Junior
BACKGROUND: High power lasers have been suggested as a useful tool for dental caries and erosion prevention due to the increase of enamel acid resistance. OBJECTIVE: to evaluate the effect of Er,Cr:YSGG (erbium,chromium:yttrium, scandium, gallium, garnet) laser irradiation pulse frequency and power on enamel surface and acid erosion resistance. METHODS: By combining pulse frequency (5-75 Hz) and power settings (0.10-1.00 W), 20 irradiated groups and one nonirradiated control group were tested...
November 2017: Photomedicine and Laser Surgery
https://www.readbyqxmd.com/read/29077628/vulvar-lymphangioma-circumscriptum-treated-with-fractional-ablative-erbium-yttrium-aluminium-garnet-laser
#7
Joy Makdisi, Sebastien de Feraudy, Christopher B Zachary
No abstract text is available yet for this article.
October 26, 2017: Dermatologic Surgery: Official Publication for American Society for Dermatologic Surgery [et Al.]
https://www.readbyqxmd.com/read/29072210/evaluation-of-effect-of-laser-etching-on-shear-bond-strength-between-maxillofacial-silicone-and-acrylic-resin-subjected-to-accelerated-aging-process
#8
Antonette Rhea, S C Ahila, B Muthu Kumar
OBJECTIVE: Maxillofacial prosthesis are supported by implants, require a retentive matrix to retain the suprastructure. The retentive matrix is made up of acrylic resin to which the silicone prostheses are anchored by micro-mechanical bond. The delamination of silicone away from the retentive matrix is a persisting problem in implant-supported maxillofacial prosthesis. AIM: This study aimed to evaluate the effect of laser etching on the shear bond strength (BS) between acrylic resin and maxillofacial silicone, after 24 h of fabrication and after 200 h of accelerated aging...
September 2017: Indian Journal of Dental Research: Official Publication of Indian Society for Dental Research
https://www.readbyqxmd.com/read/29071036/comparison-of-er-yag-laser-and-hand-instrumentation-on-the-attachment-of-cultured-human-gingival-fibroblasts-to-periodontally-involved-root-surfaces
#9
Mohammad Reza Talebi-Ardakani, Maryam Torshabi, Elahe Karami, Nazanin Vajar, Zeinab Rezaei Esfahrood, Mansour Meimandi, Seyed Masoud Mojahedi
Introduction: The present study compared the effects of erbium-doped yttrium aluminium garnet (Er:YAG) laser and hand instrumentation on the attachment of human gingival fibroblast (HGF) cells to periodontally involved root surfaces. Methods: A total of 40 tooth specimens were collected and treated in four distinct groups: scaled and root planed with hand instruments, scaled with Er:YAG laser, treated with a combination of hand instruments and Er:YAG laser and non-treated control group. The attachment and proliferation rate of HGF were assessed using MTT assay and scanning electron microscope (SEM) examination was used for cell morphological evaluation...
2017: Journal of Lasers in Medical Sciences
https://www.readbyqxmd.com/read/29058788/significant-skin-tightening-by-closure-of-fractional-ablative-laser-holes
#10
Elisabeth Russe, Martin Purschke, Wikunda Limpiangkanan, William A Farinelli, Ying Wang, Apostolos G Doukas, Fernanda H Sakamoto, Gottfried Wechselberger, Richard Rox Anderson
BACKGROUND AND OBJECTIVE: Ablative fractional laser treatment uses thousands of very small laser beam wounds to damage a fraction of the skin, which stimulates tissue remodeling. Each open micro-wound heals without scarring, but the amount of skin tightening achieved is limited. This animal study was performed to test the hypothesis that immediate temporary closure of fractional laser wounds could increase skin tightening after fractional ablative laser treatment. MATERIALS AND METHODS: Four adult swine were used for the study; 98 square test sites (3 × 3 cm) were tattooed on the abdomen and flanks of each pig...
October 23, 2017: Lasers in Surgery and Medicine
https://www.readbyqxmd.com/read/29053052/effect-of-laser-etching-on-glass-fiber-posts-cemented-with-different-adhesive-systems
#11
Ozge Parlar Oz, Asli Secilmis, Cemal Aydin
BACKGROUND: Glass fiber-reinforced posts have been preferred frequently because of some physical properties similar to the dentin, chemically bonding to dentin, biocompatibility, and esthetics. OBJECTIVE: This study aimed to evaluate the microleakage and bond strength of glass fiber posts cemented with various adhesive systems on laser-etched root canal walls. METHODS: Roots of 120 human mandibular premolars were divided into two groups for push-out bond strength test and the microleakage test (n = 60)...
October 19, 2017: Photomedicine and Laser Surgery
https://www.readbyqxmd.com/read/29048064/triple-brillouin-frequency-spacing-multiwavelength-fiber-laser-with-double-brillouin-cavities-and-its-application-in-microwave-signal-generation
#12
Zhen Wang, Tianshu Wang, Qingsong Jia, Wanzhuo Ma, Qingchao Su, Peng Zhang
We propose and experimentally investigate a multiwavelength Brillouin fiber laser (MBFL) with triple frequency spacing by employing a modular structure. In this scheme, we obtain nine channels optimized with frequency spacing of 0.259 nm. The single, double, and triple Brillouin frequency spacing for the MBFL can be easily realized by utilizing this modular structure. The impact of Brillouin pump (BP) power, BP wavelength, and erbium-ytterbium-doped fiber amplifier (EYDFA) output power on the performance of the MBFL is investigated, respectively...
September 10, 2017: Applied Optics
https://www.readbyqxmd.com/read/29047781/experimental-demonstration-of-12-5%C3%A2-%C3%A2-ghz-wideband-chaos-in-symmetric-dual-port-edfrl
#13
Shubham Mirg, Ankita Jain, Akash Pandey, Pradeep Kumar Krishnamurthy, Pascal Landais
We study the dynamics of chaos in a dual-port erbium-doped fiber ring laser (EDFRL). The laser consists of two erbium-doped fibers, intracavity filters at 1549.32 nm, isolators, and couplers. At both ports, the laser transitions into the chaotic regime for pump currents greater than 100 mA via the period doubling route. We calculate the largest Lyapunov exponent using Rosenstein's algorithm. We obtain positive values for the largest Lyapunov exponent (≈0.2) for embedding dimensions 5, 7, 9, and 11 indicating chaos...
October 1, 2017: Applied Optics
https://www.readbyqxmd.com/read/29047607/aluminum-oxide-nanoparticles-as-saturable-absorber-for-c-band-passively-q-switched-fiber-laser
#14
Sarah Kadhim Mohsin Al-Hayali, Dunya Zeki Mohammed, Wurood Abdulkhaleq Khaleel, Abdul Hadi Al-Janabi
We report on aluminum oxide nanoparticles (Al2O3 NPs) as a saturable absorber (SA) for passively Q-switched erbium-doped fiber laser (EDFL) operating at a wavelength of 1560.6 nm within the C-band region. A thin film of Al2O3-SA was prepared using polyvinyl alcohol (PVA) as a host polymer. Very stable pulses with a 57.8 KHz repetition rate and 5.6 μs pulse width at a threshold pump power of 158 mW were obtained. A 2.8 μs pulse width, 81 kHz pulse repetition rate, with maximum pulse energy of 56.7 nJ at a diode pump power of 330 mW were recorded...
June 1, 2017: Applied Optics
https://www.readbyqxmd.com/read/29047491/40%C3%A2-%C3%A2-ghz-narrow-linewidth-frequency-switched-microwave-signal-generation-based-on-a-single-longitudinal-mode-double-brillouin-frequency-spaced-brillouin-fiber-laser
#15
Qingsong Jia, Peng Zhang, Tianshu Wang, Xiaoyan Li, Baoxue Bo
A novel approach to generating 40 GHz narrow linewidth frequency-switched microwave signals is proposed and demonstrated. In this scheme, a single-longitudinal-mode (SLM) double-Brillouin-frequency spaced Brillouin fiber laser with dual-ring configuration and unpumped erbium-doped fiber (EDF) is used to generate dual-wavelength lasers, and a fiber Bragg grating is used to select the laser for different Brillouin frequency spacings. Dual-ring configuration and unpumped EDF are designed to select the mode for the SLM laser...
July 1, 2017: Applied Optics
https://www.readbyqxmd.com/read/29044113/large-second-harmonic-generation-enhancement-in-si3n4-waveguides-by-all-optically-induced-quasi-phase-matching
#16
Adrien Billat, Davide Grassani, Martin H P Pfeiffer, Svyatoslav Kharitonov, Tobias J Kippenberg, Camille-Sophie Brès
Efficient second harmonic generation in integrated platforms is usually achieved by resonant structures, intermodal phase-matching or quasi-phase matching by periodically poling ferroelectric waveguides. However, in all these structures, it is impossible to reconfigure the phase-matching condition in an all-optical way. Here, we demonstrate that a Watt-level laser causes a periodic modification of the second-order susceptibility in a silicon nitride waveguide, allowing for quasi-phase-matching between the pump and second harmonic modes for arbitrary wavelengths inside the erbium band...
October 18, 2017: Nature Communications
https://www.readbyqxmd.com/read/29041511/stable-and-wavelength-selectable-c-l-band-fiber-ring-laser-with-single-longitudinal-mode-by-utilizing-c-band-erbium-fiber-amplifier
#17
Chien-Hung Yeh, Yuan-Hong Zhuang, Ning Tsai, Chi-Wai Chow
In the investigation, we propose and demonstrate a wavelength-selectable C- plus L-band erbium-doped fiber (EDF) ring laser with single-longitudinal-mode (SLM) output. Here, a C-band erbium-doped fiber amplifier (EDFA) is utilized to serve as gain medium together with proposed multi-cross-ring (MCR) scheme to extend the wavelength tunability to L-band range. Besides, the MCR can also suppress the multi-longitudinal-mode (MLM) significantly. Therefore, the measured output power and optical signal to noise ratio (OSNR) of each lasing wavelength are between -10...
September 4, 2017: Optics Express
https://www.readbyqxmd.com/read/29041414/pump-induced-lasing-suppression-in-yb-er-doped-microlasers
#18
Fuchuan Lei, Yong Yang, Jonathan M Ward, Síle Nic Chormaic
A pump source is one of the essential prerequisites in order to achieve lasing in a system, and, in most cases, a stronger pump leads to higher laser power at the output. However, this behavior may be suppressed if two pump beams are used. In this work, we show that lasing around the 1600 nm band can be suppressed completely if two pumps, at wavelengths of 980 nm and 1550 nm, are applied simultaneously to an Yb:Er-doped microlaser, whereas it can be revived by switching one of them off. This phenomenon can be explained by assuming that the presence of one pump (980 nm) changes the role of the other pump (1550 nm); more specifically, the 1550 nm pump starts to consume the population inversion instead of increasing it when the 980 nm pump power exceeds a certain value...
October 2, 2017: Optics Express
https://www.readbyqxmd.com/read/29041158/dissipative-soliton-resonance-mode-locked-all-polarization-maintaining-double-clad-er-yb-fiber-laser
#19
Karol Krzempek, Dorota Tomaszewska, Krzysztof M Abramski
Our first demonstration of an all-PM fiber double clad erbium-ytterbium figure-8 laser mode-locked in a dissipative soliton resonance regime is presented. The laser generated µJ-level rectangular-shaped pulses with a maximum average output power of 1 W at 994 kHz repetition rate. The proposed configuration was characterized for two values resonator lengths - 44 and 205 m (total net-dispersion -0.9274 ps(2) and -4.3084 ps(2), respectively) to verify the possibility of non-complex tailoring of pulse parameters...
October 16, 2017: Optics Express
https://www.readbyqxmd.com/read/29041132/wide-bandwidth-and-flat-multiwavelength-brillouin-erbium-fiber-laser
#20
A W Al-Alimi, N A Cholan, M H Yaacob, A F Abas, M T Alresheedi, M A Mahdi
A wide bandwidth and flat multiwavelength Brillouin-erbium fiber laser is demonstrated experimentally. In the proposed laser setup, the combination of a Brillouin mirror with feedback and a ring cavity with four-wave mixing assistance is realized. The efficiency of Brillouin Stokes lines generation is enhanced by the feedback-based Brillouin mirror structure. The effect of four-wave mixing in highly nonlinear fiber increases the generation of Brillouin Stokes lines in a wider bandwidth. The laser lines over 16 nm bandwidth (i...
August 7, 2017: Optics Express
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