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https://www.readbyqxmd.com/read/28095532/1060-nm-diode-hyperthermic-laser-lipolysis-the-latest-in-non-invasive-body-contouring
#1
Laura Schilling, Nazanin Saedi, Robert Weiss
Non-invasive body contouring is becoming increasingly popular in the United States. Using the 1060 nm diode laser to achieve hyperthermic temperatures within the adipose tissue with subsequent lipolysis is one of the most recent advancements in this field and is the first of its kind. This wavelength was carefully chosen to effectively target the unwanted adipocytes while sparing the overlying skin and adnexae. Appreciable results are achieved after a single treatment, and these results are comparable to other non-invasive technologies...
January 1, 2017: Journal of Drugs in Dermatology: JDD
https://www.readbyqxmd.com/read/28091850/repeated-applications-of-photodynamic-therapy-on-candida-glabrata-biofilms-formed-in-acrylic-resin-polymerized
#2
Lírian Silva de Figueiredo Freitas, Rodnei Dennis Rossoni, Antonio Olavo Cardoso Jorge, Juliana Campos Junqueira
Previous studies have been suggested that photodynamic therapy (PDT) can be used as an adjuvant treatment for denture stomatitis. In this study, we evaluated the effects of multiple sessions of PDT on Candida glabrata biofilms in specimens of polymerized acrylic resin formed after 5 days. Subsequently, four applications of PDT were performed on biofilms in 24-h intervals (days 6-9). Also, we evaluated two types of PDT, including application of laser and methylene blue or light-emitting diode (LED) and erythrosine...
January 14, 2017: Lasers in Medical Science
https://www.readbyqxmd.com/read/28040906/the-method-of-pulsed-x-ray-detection-with-a-diode-laser
#3
Jun Liu, Xiaoping Ouyang, Zhongbing Zhang, Liang Sheng, Liang Chen, Xinjian Tan, Xiufeng Weng
A new class of pulsed X-ray detection methods by sensing carrier changes in a diode laser cavity has been presented and demonstrated. The proof-of-principle experiments on detecting pulsed X-ray temporal profile have been done through the diode laser with a multiple quantum well active layer. The result shows that our method can achieve the aim of detecting the temporal profile of a pulsed X-ray source. We predict that there is a minimum value for the pre-bias current of the diode laser by analyzing the carrier rate equation, which exists near the threshold current of the diode laser chip in experiments...
December 2016: Review of Scientific Instruments
https://www.readbyqxmd.com/read/27958555/electro-optically-spectrum-narrowed-multiline-intracavity-optical-parametric-oscillators
#4
W K Chang, H P Chung, Y Y Chou, R Geiss, S D Yang, T Pertsch, Y H Chen
We report on the first building of an active spectral narrowing mechanism in a pulsed, multiline optical parametric oscillator (OPO) based on a novel aperiodically poled lithium niobate (APPLN) device constructed using the aperiodic optical superlattice technique. The APPLN device functions simultaneously in the system as a multi-channel optical parametric down converter (OPDC) and an electro-optic (EO) gain spectral filter working on the corresponding (multiple) signal bands. When the APPLN OPO was installed in a diode pumped Nd:YVO<sub>4</sub> laser system, highly narrowed dual-wavelength signal lines (at 1540 and 1550 nm) were observed at the output of the system through EO control of the APPLN...
December 12, 2016: Optics Express
https://www.readbyqxmd.com/read/27910521/a-low-temperature-external-cavity-diode-laser-for-broad-wavelength-tuning
#5
William G Tobias, Jason S Rosenberg, Nicholas R Hutzler, Kang-Kuen Ni
We report on the design and characterization of a low-temperature external cavity diode laser (ECDL) system for broad wavelength tuning. The performance achieved with multiple diode models addresses the scarcity of commercial red laser diodes below 633 nm, which is a wavelength range relevant to the spectroscopy of many molecules and ions. Using a combination of multiple-stage thermoelectric cooling and water cooling, the operating temperature of a laser diode is lowered to -64 °C, more than 85 °C below the ambient temperature...
November 2016: Review of Scientific Instruments
https://www.readbyqxmd.com/read/27828256/propagation-of-modulated-optical-beams-carrying-orbital-angular-momentum-in-turbid-water
#6
Brandon Cochenour, Kaitlyn Morgan, Keith Miller, Eric Johnson, Kaitlin Dunn, Linda Mullen
The attenuation and temporal dispersion of beams with and without orbital angular momentum (OAM) underwater are investigated in a controlled laboratory water tank environment. Both spherical polystyrene beads and a commercial antacid are used to determine the effect of scattering particle size and shape on the results. Varying concentrations of the scattering agents were used to study the propagation of light in both minimally scattered and multiply scattered regimes (over 20 attenuation lengths). To study temporal dispersion, a custom diode seeded fiber amplified laser source is used to modulate beams up to 1 GHz, and diffractive spiral phase plates are used to compare performance over different spatial modes...
November 1, 2016: Applied Optics
https://www.readbyqxmd.com/read/27760646/-the-efficacy-of-large-spot-indirect-ophthalmoscopy-laser-alone-or-combined-with-systemic-chemotherapy-in-retinoblastoma-therapy
#7
J H Liang, Y Cheng, X Deng, Y Y Yu, X X Li
: Objective: To evaluate the efficacy of large spot indirect ophthalmoscopy laser alone or combined with systemic chemotherapy in the treatment of early and middle stage retinoblastoma. Methods: Retrospective series case study. Clinical data of 21 patients (22 eyes) who were diagnosed as retinoblastoma (RB) in Peking University People's Hospital from March 2009 to August 2014 were collected. Medical and family history, ocular ultrasound, orbital and cranial MRI or CT examination of RB Children were detailed recorded...
October 11, 2016: [Zhonghua Yan Ke za Zhi] Chinese Journal of Ophthalmology
https://www.readbyqxmd.com/read/27732068/hydrogen-isotopic-composition-of-arctic-and-atmospheric-ch4-determined-by-a-portable-near-infrared-cavity-ring-down-spectrometer-with-a-cryogenic-pre-concentrator
#8
Y Chen, Kevin K Lehmann, Y Peng, L M Pratt, J R White, S B Cadieux, B Sherwood Lollar, G Lacrampe-Couloume, T C Onstott
In this study, near-infrared continuous wave cavity ring-down spectroscopy was applied to the measurement of the δ(2)H of methane (CH4). The cavity ring-down spectrometer (CRDS) system consisted of multiple DFB laser diodes to optimize selection of spectral line pairs. By rapidly switching measurements between spectral line peaks and the baseline regions, the long-term instrumental drift was minimized, substantially increasing measurement precision. The CRDS system coupled with a cryogenic pre-concentrator measured the δ(2)H of terrestrial atmospheric CH4 from 3 standard liters of air with a precision of ±1...
October 2016: Astrobiology
https://www.readbyqxmd.com/read/27726169/selective-photoantisepsis
#9
David M Harris, Lou Reinisch
BACKGROUND AND OBJECTIVE: Selective killing of pathogens by laser is possible due to the difference in absorption of photon energy by pathogens and host tissues. The optical properties of pathogenic microorganisms are used along with the known optical properties of soft tissues in calculations of the laser-induced thermal response of pathogen colonies embedded in a tissue model. The objective is to define the laser parameters that optimize pathogen destruction and depth of the bactericidal effect...
October 10, 2016: Lasers in Surgery and Medicine
https://www.readbyqxmd.com/read/27677521/spectroscopic-and-device-aspects-of-nanocrystal-quantum-dots
#10
Jeffrey M Pietryga, Young-Shin Park, Jaehoon Lim, Andrew F Fidler, Wan Ki Bae, Sergio Brovelli, Victor I Klimov
The field of nanocrystal quantum dots (QDs) is already more than 30 years old, and yet continuing interest in these structures is driven by both the fascinating physics emerging from strong quantum confinement of electronic excitations, as well as a large number of prospective applications that could benefit from the tunable properties and amenability toward solution-based processing of these materials. The focus of this review is on recent advances in nanocrystal research related to applications of QD materials in lasing, light-emitting diodes (LEDs), and solar energy conversion...
September 28, 2016: Chemical Reviews
https://www.readbyqxmd.com/read/27661573/method-for-predicting-junction-temperature-distribution-in-a-high-power-laser-diode-bar
#11
Dae-Suk Kim, Caleb Holloway, Bongtae Han, Avram Bar-Cohen
A hybrid experimental/numerical method is proposed for predicting the junction temperature distribution in a high-power laser diode (LD) bar with multiple emitters. A commercial water-cooled LD bar with multiple emitters is used to illustrate and validate the proposed method. A unique experimental setup is developed and implemented first to measure the average junction temperatures of the LD bar emitters. After measuring the heat dissipation of the LD bar, the effective heat transfer coefficient of the cooling system is determined inversely from the numerical simulation using the measured average junction temperature and the heat dissipation...
September 20, 2016: Applied Optics
https://www.readbyqxmd.com/read/27630957/comparative-morphologic-evaluation-and-occluding-effectiveness-of-nd-yag-co2-and-diode-lasers-on-exposed-human-dentinal-tubules-an-invitro-sem-study
#12
Mini Saluja, Harpreet Singh Grover, Pankaj Choudhary
INTRODUCTION: Dentinal hypersensitivity is one of the most common problem, encountered in dental practice but has least predictable treatment outcome. The advent of lasers in dentistry has provided an additional therapeutic option for treating dentinal hypersensitivity. Although various lasers have been tried over a period of time to treat dentinal hypersensitivity, but still the doubt persist as to which laser leads to maximum dentinal tubular occlusion and is most suitable with minimal hazardous effects...
July 2016: Journal of Clinical and Diagnostic Research: JCDR
https://www.readbyqxmd.com/read/27615808/orbital-angular-momentum-based-space-division-multiplexing-for-high-capacity-underwater-optical-communications
#13
Yongxiong Ren, Long Li, Zhe Wang, Seyedeh Mahsa Kamali, Ehsan Arbabi, Amir Arbabi, Zhe Zhao, Guodong Xie, Yinwen Cao, Nisar Ahmed, Yan Yan, Cong Liu, Asher J Willner, Solyman Ashrafi, Moshe Tur, Andrei Faraon, Alan E Willner
To increase system capacity of underwater optical communications, we employ the spatial domain to simultaneously transmit multiple orthogonal spatial beams, each carrying an independent data channel. In this paper, we show up to a 40-Gbit/s link by multiplexing and transmitting four green orbital angular momentum (OAM) beams through a single aperture. Moreover, we investigate the degrading effects of scattering/turbidity, water current, and thermal gradient-induced turbulence, and we find that thermal gradients cause the most distortions and turbidity causes the most loss...
2016: Scientific Reports
https://www.readbyqxmd.com/read/27581309/a-multiport-mr-compatible-neuroendoscope-spanning-the-gap-between-rigid-and-flexible-scopes
#14
Sunil Manjila, Margherita Mencattelli, Benoit Rosa, Karl Price, Georgios Fagogenis, Pierre E Dupont
OBJECTIVE Rigid endoscopes enable minimally invasive access to the ventricular system; however, the operative field is limited to the instrument tip, necessitating rotation of the entire instrument and causing consequent tissue compression while reaching around corners. Although flexible endoscopes offer tip steerability to address this limitation, they are more difficult to control and provide fewer and smaller working channels. A middle ground between these instruments-a rigid endoscope that possesses multiple instrument ports (for example, one at the tip and one on the side)-is proposed in this article, and a prototype device is evaluated in the context of a third ventricular colloid cyst resection combined with septostomy...
September 2016: Neurosurgical Focus
https://www.readbyqxmd.com/read/27550874/all-optical-analog-comparator
#15
Pu Li, Xiaogang Yi, Xianglian Liu, Dongliang Zhao, Yongpeng Zhao, Yuncai Wang
An analog comparator is one of the core units in all-optical analog-to-digital conversion (AO-ADC) systems, which digitizes different amplitude levels into two levels of logical '1' or '0' by comparing with a defined decision threshold. Although various outstanding photonic ADC approaches have been reported, almost all of them necessitate an electrical comparator to carry out this binarization. The use of an electrical comparator is in contradiction to the aim of developing all-optical devices. In this work, we propose a new concept of an all-optical analog comparator and numerically demonstrate an implementation based on a quarter-wavelength-shifted distributed feedback laser diode (QWS DFB-LD) with multiple quantum well (MQW) structures...
2016: Scientific Reports
https://www.readbyqxmd.com/read/27504592/nonpigmented-hair-removal-using-photodynamic-therapy-in-animal-model
#16
Hyoseung Shin, Ji-Seon Yoon, Wooseok Koh, Jin Yong Kim, Chang-Hyun Kim, Kang Min Han, Eo Jin Kim, Ohsang Kwon
BACKGROUND AND OBJECTIVE: Lasers have been successfully used for decades to remove dark hair. However, laser removal of nonpigmented hair is challenging due to the lack of chromophores. The aim of this study was to use photodynamic therapy (PDT) to remove nonpigmented hair. STUDY DESIGN/MATERIAL AND METHODS: We compared the efficacy of permanent hair reduction in white BALB/c and black C57BL/6 mice treated with PDT or an 800-nm diode laser. We collected skin biopsy specimens and investigated post-PDT histologic changes and molecular changes...
October 2016: Lasers in Surgery and Medicine
https://www.readbyqxmd.com/read/27496291/a-systematic-review-of-the-use-of-lasers-for-the-treatment-of-hidradenitis-suppurativa
#17
Hannah John, Nikolaos Manoloudakis, J Stephen Sinclair
AIM: To conduct a systematic review of the effectiveness of various types of lasers (and light based therapies) for the treatment of hidradenitis suppurativa (HS) and to establish recommendations based on our findings. DATA SOURCES: MEDLINE, Cochrane and PubMed databases. STUDY SELECTION: English language studies describing the use of laser for the treatment of HS. DATA EXTRACTION: Multiple reviewers performed independent extraction and identified 22 studies that met the inclusion and exclusion criteria...
October 2016: Journal of Plastic, Reconstructive & Aesthetic Surgery: JPRAS
https://www.readbyqxmd.com/read/27469564/evaluation-of-light-emitting-diode-led-835-nm-application-over-human-gingival-fibroblast-an-in-vitro-study
#18
M Roncati, D Lauritano, F Cura, F Carinci
Since the laser and photomodulation were discovered over 50 years, they have been used for many applications in medicine and in dentistry also. In particular, light-emitting diodes therapy (LT) achieved a great success in medical treatment and photo-therapy. In the decades, LT has been used for several therapeutic purposes. Many beneficial effects have been demonstrated in vitro and in vivo, including antibacterial, antiviral, antitumor, cell differentiation, immune potentiating and tissue repair activities...
April 2016: Journal of Biological Regulators and Homeostatic Agents
https://www.readbyqxmd.com/read/27252025/antimicrobial-photodynamic-therapy-of-s-mutans-biofilms-attached-to-relevant-dental-materials
#19
Michelle L Zoccolillo, Stephen C Rogers, Thomas S Mang
BACKGROUND: Antimicrobial Photodynamic therapy (aPDT) has demonstrated efficacy in situations where conventional antibiotic therapies can be challenged such as biofilms, gram-negative bacteria, and antimicrobial resistant organisms. Surface characteristics can affect biofilm adherence and integrity and so may modify the effectiveness of aPDT. This study investigates the killing efficacy of aPDT on S. mutans biofilms grown on relevant dental substrata, examining the killing efficacy and specifically the effects of aPDT on the biofilm matrix architecture...
June 1, 2016: Lasers in Surgery and Medicine
https://www.readbyqxmd.com/read/27244418/generation-of-optical-frequency-combs-in-a-fiber-ring-microresonator-laser-system
#20
Changlei Guo, Kaijun Che, Huiying Xu, Pan Zhang, Deyu Tang, Changyan Ren, Zhengqian Luo, Zhiping Cai
We propose and experimentally demonstrate a simple scheme for generating optical frequency combs (OFCs) in a fiber-ring/microresonator laser system. The ultrahigh Q whispering gallery mode microresonator is employed both as a mode reflection mirror to generate erbium lasing and as a Kerr-nonlinearity initiator that introduces optical parametric oscillation signals to form OFCs. By controlling the coupling position between the fiber taper and microresonator, optimizing the fiber polarization, as well as the pump power from a 974 nm laser diode (LD), versatile OFCs can be tuned out from single-wavelength states...
June 1, 2016: Optics Letters
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