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https://www.readbyqxmd.com/read/28444150/optoacoustic-diagnostic-modality-from-idea-to-clinical-studies-with-highly-compact-laser-diode-based-systems
#1
Rinat O Esenaliev
No abstract text is available yet for this article.
September 1, 2017: Journal of Biomedical Optics
https://www.readbyqxmd.com/read/28442314/photodynamic-therapy-in-the-management-of-basal-cell-carcinoma-retrospective-evaluation-of-outcome
#2
Waseem Jerjes, Zaid Hamdoon, Colin Hopper
INTRODUCTION: Photodynamic therapy (PDT) is a relatively new method of treating various kinds of pathologies. In this retrospective study, a total of 148 patients with basal cell carcinoma (BCC) were treated with surface illumination methyl aminolevulinate - photodynamic therapy (MAL-PDT) or meta-tetrahydroxyphenylchlorin (mTHPC-PDT). Comparisons with the clinical features, rate of recurrence and overall outcome were made. MATERIALS AND METHODS: Surface illumination PDT was offered under local or general anaesthesia...
April 22, 2017: Photodiagnosis and Photodynamic Therapy
https://www.readbyqxmd.com/read/28438509/effect-of-photodynamic-therapy-based-on-indocyanine-green-on-expression-of-apoptosis-related-genes-in-human-gingival-fibroblast-cells
#3
Samira Gharesi, Maryam Pourhajibagher, Nasim Chiniforush, Reza Raoofian, Mehrdad Hashemi, Sima Shahabi, Abbas Bahador
BACKGROUND: Periodontal diseases refer to inflammation of the gingiva, induction of apoptosis in human gingival fibroblast cells, destruction of the surrounding tissues, and early bone loss resulting in infections due to the pathogenic activity of the microorganisms and the host immune inflammatory responses. Recent investigations have suggested that antimicrobial photodynamic therapy (aPDT) can be an adjunct treatment therapy for periodontal infections. AIM: To prove the lack of side effects of PDT on periodontal tissues, we investigated the expression of BAX and BCL-2 genes that are involved in apoptosis after the PDT on human gingival fibroblast (HGF) cells...
April 21, 2017: Photodiagnosis and Photodynamic Therapy
https://www.readbyqxmd.com/read/28438153/damage-to-the-macula-associated-with-led-derived-blue-laser-exposure-a-case-report
#4
Lingling Liang, Zhihua Cui, Chengwei Lu, Qian Hao, Yajuan Zheng
BACKGROUND: Light emitting diodes laser is emerging as an important source of light replacing conventional lights. It is widely used for illumination in the bar where young people love to go. But not everyone knows about the light damage to the eye especially to the macula. In this article, we report the case of a macular damage induced by LED-derived blue laser in a bar, studied with optical coherence tomography (OCT) to evaluate the retinal lesion and multifocal electroretinography (mfERG) to evaluate functional damage...
April 24, 2017: BMC Ophthalmology
https://www.readbyqxmd.com/read/28437950/maximum-likelihood-sequence-estimation-for-optical-complex-direct-modulation
#5
Di Che, Feng Yuan, William Shieh
Semiconductor lasers are versatile optical transmitters in nature. Through the direct modulation (DM), the intensity modulation is realized by the linear mapping between the injection current and the light power, while various angle modulations are enabled by the frequency chirp. Limited by the direct detection, DM lasers used to be exploited only as 1-D (intensity or angle) transmitters by suppressing or simply ignoring the other modulation. Nevertheless, through the digital coherent detection, simultaneous intensity and angle modulations (namely, 2-D complex DM, CDM) can be realized by a single laser diode...
April 17, 2017: Optics Express
https://www.readbyqxmd.com/read/28437908/ionization-degree-measurement-in-the-gain-medium-of-a-hydrocarbon-free-rubidium-vapor-laser-operating-in-pulsed-and-cw-modes
#6
Xiaofan Zhao, Zining Yang, Weihong Hua, Hongyan Wang, Xiaojun Xu
Although the diode pumped alkali laser (DPAL) works in a three-level scheme, higher energy-state excitation and ionization processes exist during operation, which may lead to deleterious effects on laser performance. In this paper, we report the ionization degree measurement in the gain medium of an operational hydrocarbon-free Rb DPAL by using the optogalvanic method. The results show that, at the pulsed mode with a duration of ~1 ms, a maximal ionization degree of ~0.06% is obtained at a pump power of 140 W...
April 17, 2017: Optics Express
https://www.readbyqxmd.com/read/28437191/analysis-of-human-tooth-pulp-chamber-temperature-after-670%C3%A2-nm-laser-irradiation-in-vitro-study
#7
Cleide Regina Alves Carrara de Oliveira, Fátima Zanin, Alessandra Cassoni, José Augusto Rodrigues, Landulfo Silveira, Marcos Tadeu Pacheco, Aldo Brugnera
OBJECTIVE: One of the limiting factors of employing laser radiation on dental therapies is the potential of causing thermal injuries to pulp tissues. The purpose of this study was to evaluate intra-chamber temperature increase on extracted human teeth exposed to 670 nm wavelength InGaAlP laser diode radiation. MATERIALS AND METHODS: In vitro intra-chamber temperature measurements of 12 standardized human teeth (incisors, canines, premolars, and molars; n = 3) were taken both before and after laser radiation...
February 16, 2017: Photomedicine and Laser Surgery
https://www.readbyqxmd.com/read/28434049/a-prospective-study-of-the-safety-and-efficacy-of-a-combined-bipolar-radiofrequency-intense-pulsed-light-and-infrared-diode-laser-treatment-for-global-facial-photoaging
#8
Min Jiang, Fang Yan, Mathew Avram, Zhong Lu
The clinical features of photoaging include: skin texture changes, laxity, rhytides, pigmentary changes, and vascular changes such as erythema and telangiectasias. In order to meet patients' increasing demands for improving all aspects of photoaging at one office visit, employing a multi-modality treatment for all aspects of photoaging has become increasingly desirable for the physician and patient alike. We examine a novel device that employs bipolar radiofrequency (RF), intense pulsed light (IPL), and infrared diode laser...
April 23, 2017: Lasers in Medical Science
https://www.readbyqxmd.com/read/28430235/fiber-bragg-grating-interrogation-using-wavelength-modulated-tunable-distributed-feedback-lasers-and-a-fiber-optic-mach-zehnder-interferometer
#9
Anirban Roy, Arup Lal Chakraborty, Chandan Kumar Jha
This paper demonstrates a technique of high-resolution interrogation of two fiber Bragg gratings (FBGs) with flat-topped reflection spectra centered on 1649.55 nm and 1530.182 nm with narrow line width tunable semiconductor lasers emitting at 1651.93 nm and 1531.52 nm, respectively. The spectral shift of the reflection spectrum in response to temperature and strain is accurately measured with a fiber-optic Mach-Zehnder interferometer that has a free spectral range of 0.0523 GHz and a broadband photodetector...
April 20, 2017: Applied Optics
https://www.readbyqxmd.com/read/28430225/phase-shifting-by-wavelength-modulation-in-a-cube-beam-splitter-interferometer
#10
Uriel Rivera-Ortega
A low-cost and fully automated process for phase-shifting interferometry by continuously changing the input voltage of a laser diode under the scheme of a cube beam splitter interferometer, performing as a two-window common-path interferometric setup, is presented. The input signal of a laser diode is controlled by a data acquisition device which permits a change in its wavelength according to its tunability features. The automation and data analysis is done using LabVIEW in combination with MATLAB. By using the Carré algorithm, the phase map is obtained...
April 20, 2017: Applied Optics
https://www.readbyqxmd.com/read/28429193/effect-of-non-coherent-infrared-light-led-%C3%AE-945%C3%A2-%C3%A2-%C3%A2-20%C3%A2-nm-on-bone-repair-in-diabetic-rats-morphometric-and-spectral-analyses
#11
Alexandre Greca Diamantino, Renata Amadei Nicolau, Davidson Ribeiro Costa, Alessandra Paes de Barros Almeida, Danila Xênia de Miranda Mato, Marco Antonio de Oliveira, Ana Maria do Espírito Santo
Phototherapy using coherent light (lasers) and non-coherent light (light-emitting diodes (LEDs)) has been investigated for the purpose of biomodulation in biological tissues. Several effects can be expected, including pain moderation, biostimulation of cellular tropism, anti-inflammatory effects, regular circulatory stimulation, and tissue repair. The aim of this study was to evaluate the effect of LED (λ945 ± 20 nm, 48 mW) therapy on the regeneration process in femoral lesions of rats (Wistar). Seven irradiation sessions were held, with a 48-h interval between sessions...
April 20, 2017: Lasers in Medical Science
https://www.readbyqxmd.com/read/28418535/breath-analysis-using-external-cavity-diode-lasers-a-review
#12
Ismail Bayrakli
No abstract text is available yet for this article.
April 1, 2017: Journal of Biomedical Optics
https://www.readbyqxmd.com/read/28416848/-effect-of-low-level-laser-irradiation-on-proliferation-and-osteogenic-differentiation-of-human-adipose-derived-stromal-cells
#13
H X Sui, P J Lv, Y G Wang, Y Wang, Y C Sun
OBJECTIVE: To examine the in vitro effects of low-level laser irradiation (LLLI) on proliferation and differentiation of human adipose-derived stromal cells (hASCs). METHODS: Cultured cells were exposed to different doses of LLLI with a semiconductor diode laser (980 nm; 100 mW-12 W power output). The effects of laser on proliferation were assessed daily up to seven days of culture in cells irradiated for four consecutive days with laser doses of 2, 4, 6 or 8 J/cm(2), the cells without irradiation were used as controls...
April 18, 2017: Beijing da Xue Xue Bao. Yi Xue Ban, Journal of Peking University. Health Sciences
https://www.readbyqxmd.com/read/28414369/frequency-comb-calibrated-frequency-sweeping-interferometry-for-absolute-group-refractive-index-measurement-of-air
#14
Lijun Yang, Xuejian Wu, Haoyun Wei, Yan Li
The absolute group refractive index of air at 194061.02 GHz is measured in real time using frequency-sweeping interferometry calibrated by an optical frequency comb. The group refractive index of air is calculated from the calibration peaks of the laser frequency variation and the interference signal of the two beams passing through the inner and outer regions of a vacuum cell when the frequency of a tunable external cavity diode laser is scanned. We continuously measure the refractive index of air for 2 h, which shows that the difference between measured results and Ciddor's equation is less than 9...
April 10, 2017: Applied Optics
https://www.readbyqxmd.com/read/28414352/infrared-absorption-spectrometer-for-the-determination-of-temperature-and-species-profiles-in-an-entrained-flow-gasifier
#15
Patrick Nau, Peter Kutne, Georg Eckel, Wolfgang Meier, Christian Hotz, Sabine Fleck
An absorption spectrometer utilizing a tunable distributed feedback diode laser at 2.3 μm and an interband cascade laser at 3.1 μm has been developed to measure temperature and concentrations of CO, CH<sub>4</sub>, C<sub>2</sub>H<sub>2</sub>, and H<sub>2</sub>O under gasification conditions. A wavelength division multiplexing approach using a single ZrF<sub>4</sub>-fiber was used to measure both wavelength regions simultaneously. The performance of the spectrometer has been tested in laminar flat flames and a heated cell and then applied for measurements at an atmospheric entrained flow gasifier (REGA)...
April 10, 2017: Applied Optics
https://www.readbyqxmd.com/read/28414350/cr-zns-saturable-absorber-passively-q-switched-mode-locking-tm-ho-llf-laser
#16
Xinlu Zhang, Yong Luo, Tianhan Wang, Junfeng Dai, Jianxin Zhang, Jiang Li, Jinhui Cui, Jinjer Huang
We first report on a diode-end-pumped passively Q-switched mode-locking Tm,Ho:LLF laser at 2053 nm by using a Cr:ZnS saturable absorber. A stable Q-switched mode-locking pulse train with a nearly 100% modulation depth was achieved. The repetition frequency of the Q-switched pulse envelope increased from 0.5 to 12.3 kHz with increasing pump power from 1 to 4.36 W. The maximum average output power of 145 mW was obtained, and the width of the mode-locked pulse was estimated to be less than 682 ps with a 250 MHz repetition frequency within a Q-switched pulse envelope of about 700 ns...
April 10, 2017: Applied Optics
https://www.readbyqxmd.com/read/28414349/second-harmonic-generation-of-a-dual-frequency-laser-in-a-mgo-ppln-crystal
#17
Ying Kang, Suhui Yang, Marc Brunel, Lijun Cheng, Changming Zhao, Haiyang Zhang
A dual-frequency CW laser at a wavelength of 1.064 μm is frequency doubled in a MgO:PPLN nonlinear crystal. The fundamental dual-frequency laser has a tunable beat note from 125 MHz to 175 MHz. A laser-diode pumped fiber amplifier is used to amplify the dual-frequency fundamental output to a maximum power of 50 W before frequency doubling. The maximum output power of the green light is 1.75 W when the input fundamental power is 12 W, corresponding to a frequency doubling efficiency of 14.6%. After frequency doubling, green light with modulation frequencies in two bands from 125 MHz to 175 MHz and from 250 MHz to 350 MHz is achieved simultaneously...
April 10, 2017: Applied Optics
https://www.readbyqxmd.com/read/28414335/uncertainty-quantification-and-design-of-experiment-in-absorption-based-aqueous-film-parameter-measurements-using-bayesian-inference
#18
R Pan, K J Daun, T Dreier, C Schulz
Diode laser-based multi-wavelength near-infrared (NIR) absorption in aqueous films is a promising diagnostic for making temporally resolved, simultaneous measurements of film thickness, temperature, and concentration of a solute. Our previous work in aqueous urea solutions aimed at determining simultaneously two of these system parameters, while the third one must be fixed or specified by additional measurements. The current work presents a simultaneous NIR absorption-based multi-parameter measurement of thickness, temperature, and solute concentration coupled with the Bayesian methodology that is used to infer probability densities for the obtained data...
April 10, 2017: Applied Optics
https://www.readbyqxmd.com/read/28414334/interband-cascade-laser-based-optical-transfer-standard-for-atmospheric-carbon-monoxide-measurements
#19
Javis A Nwaboh, Zhechao Qu, Olav Werhahn, Volker Ebert
We report on an interband cascade laser (ICL)-absorption spectrometer for absolute, calibration-free, atmospheric CO amount fraction measurements, addressing direct traceability of the results. The system combines first-principles direct tunable diode laser absorption spectroscopy (dTDLAS) with a metrological validation. Using a multipath cell with 76 m path length, our detection limit is 0.5 nmol/mol at Δt=14  s. The system is highly linear (slope: 0.999±0.008) in the amount fraction range of 0.1-1000 μmol/mol and thus is interesting for industrial as well as environmental applications...
April 10, 2017: Applied Optics
https://www.readbyqxmd.com/read/28414231/organic-phosphorescence-nanowire-lasers
#20
Zhenyi Yu, Yishi Wu, Lu Xiao, Jianwei Chen, Qing Liao, Jiannian Yao, Hongbing Fu
Organic solid-state lasers (OSSLs) based on singlet fluorescence have merited intensive study as an important class of light sources. Although the use of triplet phosphors has led to 100% internal quantum efficiency in organic light-emitting diodes (OLEDs), stumbling blocks in triplet lasing include generally forbidden intersystem crossing (ISC) and a low quantum yield of phosphorescence (ΦP). Here, we reported the first triplet-phosphorescence OSSL from a nanowire microcavity of a sulfide-substituted difluoroboron compound...
April 25, 2017: Journal of the American Chemical Society
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