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diode laser

Watheq Al-Basheer, AbdulAziz Al-Jalal, Khaled Gasmi
The (18)O/(16)O and (2)H/(1)H ratios of 18 water brands representing the most popular bottled water brands in the Saudi market were measured using a system based on the latest advancements in tunable off-axis integrated cavity output diode laser spectroscopy (OA-ICOS) in the near-infrared spectral region. Utilizing δ(18)O and the δ(2)H values of locally produced water samples, a meteoric water line (δ(2)H = 7.84 δ(18)O + 2.11) was extracted and found to be consistent with the slope of the global meteoric water line (GMWL) and the geographic location of Saudi Arabia...
September 15, 2017: Isotopes in Environmental and Health Studies
Nour J Youssef, Alain G Rizk, Omar A Ibrahimi, Zeina S Tannous
BACKGROUND The 800 nm long-pulsed diode laser machine is safe and effective for permanent hair reduction. Traditionally, most long-pulsed diode lasers used for hair removal had a relatively small spot size. Recently, a long-pulsed diode laser with a large spot size and vacuum assisted suction handpiece was introduced. The treatment parameters of each type of handpiece differ. Short and long-term clinical efficacy, treatment associated pain, and patient satisfaction are important factors to be considered. OBJECTIVE: This study aims to conduct a direct head to head comparison of both handpieces of the 800nm long-pulsed diode laser by evaluating long term hair reduction, treatment associated pain and patient satisfaction...
September 1, 2017: Journal of Drugs in Dermatology: JDD
Liang Mei, Peng Guan
A polarization Scheimpflug lidar system based on the Scheimpflug principle has been developed by employing two linearly polarized 808 nm laser diodes and a complementary metal-oxide-semiconductor (CMOS) image sensor. The polarization of one laser diode is rotated 90° by a half-wave plate. The two laser beams with orthogonal polarizations are combined by a polarization beam splitter and transmitted into the atmosphere. The corresponding parallel- and perpendicular-polarized backscattering echoes are detected by the 45° tilted CMOS sensor using a time-division multiplexing scheme...
September 15, 2017: Optics Letters
Christian Bacci, Luca Sacchetto, Gastone Zanette, Stefano Sivolella
OBJECTIVE: The current work examined a consecutive series of patients presenting vascular malformations (VMs) and venous lakes (VLs) of the lip and oral mucosa who were treated with transmucosal diode laser applications and assessed over a 1 year period. STUDY DESIGN AND METHODS: Fifty-nine patients (31 males and 28 females) presenting low-flow VMs or VLs of the oral cavity were treated transmucosally using a diode laser (with an 830 nm operating wavelength and 1...
September 14, 2017: Lasers in Surgery and Medicine
Wasfy M Obeidat, Ekneet Sahni, William Kessler, Michael Pikal
The goal of the work described in this publication was to evaluate a new, small, material-sparing freeze dryer, denoted as the "mini-freeze dryer or mini-FD", capable of reproducing the product temperature history of larger freeze dryers, thereby facilitating scale-up. The mini-FD wall temperatures can be controlled to mimic loading procedures and dryer process characteristics of larger dryers. The mini-FD is equipped with a tunable diode laser absorption spectroscopy (TDLAS) water vapor mass flow monitor and with other advanced process analytical technology (PAT) sensors...
September 13, 2017: AAPS PharmSciTech
Bruce Katz, Sean Doherty
BACKGROUND: Preliminary reports indicate a hyperthermic diode laser treatment could be a safe and effective method for noninvasive fat reduction using the 1,060-nm wavelength. This wavelength penetrates the skin to heat subcutaneous adipocytes causing cellular disruption, leaving extracellular lipids, and cellular debris to be evacuated naturally by the body. OBJECTIVE: To evaluate the safety and effectiveness of this modality for noninvasive fat reduction of the flanks...
September 4, 2017: Dermatologic Surgery: Official Publication for American Society for Dermatologic Surgery [et Al.]
Anita Kumari, Manisha Mondal, Vineet Kumar Rai, Satyendra Narayan Singh
Ho3+/Yb3+/Tm3+/Li+:Gd2(MoO4)3 nanophosphors successfully synthesized via solid state reaction method have been structurally and optically characterized. Under 980 nm diode laser excitation the nanophosphors emit intense blue, green, red and NIR emissions peaking at ~ 476 nm, ~ 543 nm, ~ 646 nm and ~ 798 nm corresponding to the 1G4→3H6 (Tm3+), 5F4, 5S2→5I8 (Ho3+), 5F5 →5I8 (Ho3+) and 3H4→3H6 (Tm3+) transitions respectively. The UC emission intensity enhancement in the Ho3+-Yb3+-Tm3+-Li+:Gd2(MoO4)3 nanophosphors for the green band is found to be ~ 367, ~ 50 and ~ 9 times compared to the singly Ho3+ doped, Ho3+-Yb3+ co-doped and Ho3+-Yb3+-Tm3+ tri-doped Gd2(MoO4)3 nanophosphors...
September 13, 2017: Methods and Applications in Fluorescence
Lino Polese, Lucia Marini, Roberto Rizzato, Edgardo Picardi, Stefano Merigliano
The purpose of this study is to determine the effectiveness of endoscopic diode laser therapy in patients presenting rectal bleeding due to chronic radiation proctitis (CRP). A retrospective analysis of CRP patients who underwent diode laser therapy in a single institution between 2010 and 2016 was carried out. The patients were treated by non-contact fibers without sedation in an outpatient setting. Fourteen patients (median age 77, range 73-87 years) diagnosed with CRP who had undergone high-dose radiotherapy for prostatic cancer and who presented with rectal bleeding were included...
September 11, 2017: Lasers in Medical Science
Chen Zou, Chun-Ying Huang, Erin M Sanehira, Joseph Luther, Lih Y Lin
Recently, all-inorganic perovskites such as CsPbBr3 and CsPbI3, have emerged as promising materials for light-emitting applications. While encouraging performance has been demonstrated, the stability issue of the red-emitting CsPbI3 is still a major concern due to its small tolerance factor. Here we report a highly stable CsPbI3 quantum dot LED with red emission fabricated using an improved purification approach. The device achieved decent external quantum efficiency (EQE) of 0.21 % at a bias of 6 V and outstanding operational stability, with a L70 lifetime (EL intensity decreases to 70% of starting value) of 16 h and 1...
September 11, 2017: Nanotechnology
Gyanendra Kumar, Ferah Rehman, Vivek Chaturvedy
Soft tissue laser, such as diode and Nd:YAG lasers were initially used in soft tissue lesions because of its increased success rate. It was because of the fact that these lasers were well-absorbed by chromophores, such as hemoglobin and melanin which are found abundant in the oral mucosa. The introduction of erbium family in 1990 comprising the Er:YAG and Er,Cr:YSGG lasers made the hard tissue laser a boon for dentistry. Erbium, chromium-doped yttrium, scandium, gallium and garnet (Er,Cr:YSGG) was introduced in 1997 for the surgical needs of clinical dentistry in general practice...
April 2017: International Journal of Clinical Pediatric Dentistry
Andreas Braun, Moritz Kettner, Michael Berthold, Johannes-Simon Wenzler, Paul Günther Baptist Heymann, Roland Frankenberger
Using a 445-nm semiconductor laser for tissue incision, an effective cut is expected due to the special absorption properties of blue laser light in soft tissues. The aim of the present study was the histological evaluation of tissue samples after incision with a 445-nm diode laser. Forty soft tissue specimens were obtained from pork oral mucosa and mounted on a motorized linear translation stage. The handpiece of a high-frequency surgery device, a 970-nm semiconductor laser, and a 445-nm semiconductor laser were connected to the slide, allowing a constant linear movement (2 mm/s) and the same distance of the working tip to the soft tissue's surface...
September 9, 2017: Lasers in Medical Science
Ning Yuan, Hong-Xue Sun, Dan-Dan Ju, Da-Yu Liu, Zi-Bo Zhang, Wing-Han Wong, Feng Song, Dao-Yin Yu, Edwin Yue-Bun Pun, De-Long Zhang
We developed a highly efficient optical thermometer based on intensity ratio of upconversion green fluorescence of Er(3+)/Yb(3+)-codoped NaYF4 microcrystals. The sensor consists simply of a 980nm laser diode, one narrow-band interference filter, two lenses, one Si-photocell and one multimeter, while being without use of spectrometer and additional electronics. The device not only has a simple, compact structure (hence a low cost), but also displays highly efficient sensing performance, characterized by large signal-to-noise ratio due to strong fluorescence intensity, high thermal resolution and sensitivity, which have the values 1...
December 1, 2017: Materials Science & Engineering. C, Materials for Biological Applications
Aroon Teerakapong, Teerasak Damrongrungruang, Sajee Sattayut, Noppawan Phumala Morales, Surada Tantananugool
BACKGROUND: The purpose of this in vitro study was to evaluate the efficacy of erythrosine and cyanidin-3-glucoside as photosensitizers in PDT for the elimination of Porphyromonas gingivalis (P. gingivalis) biofilms. METHODS: P. gingivalis biofilms were prepared from a chronic periodontitis subject. Erythrosine and cyanidin-3-glucoside were prepared and randomly allocated as follows: 110, 220, 330, and 440μM erythrosine; 101, 202, 303, and 404μM anthocyanin; and 440μM erythrosine+404μM cyanidin-3-glucoside...
September 5, 2017: Photodiagnosis and Photodynamic Therapy
Nancy Elizabeth González-Sierra, Luz Del Carmen Gómez-Pavón, Gerardo Francisco Pérez-Sánchez, Arnulfo Luis-Ramos, Plácido Zaca-Morán, Jesús Manuel Muñoz-Pacheco, Francisco Chávez-Ramírez
A comparative study on the sensing properties of a tapered optical fiber pristine and functionalized with the palladium nanoparticles to hydrogen and volatile organic compounds (VOCs), is presented. The sensor response and, response/recovery times were extracted from the measurements of the transient response of the device. The tapered optical fiber sensor was fabricated using a single-mode optical fiber by the flame-brushing technique. Functionalization of the optical fiber was performed using an aqueous solution of palladium chloride by drop-casting technique assisted for laser radiation...
September 6, 2017: Sensors
Leticia Ferreira de Freitas Brianezzi, Rafael Massunari Maenosono, Odair Bim, Giovanna Speranza Zabeu, Regina Guenka Palma-Dibb, Sérgio Kiyoshi Ishikiriama
Objective: This study aimed to investigate the effect of laser diode irradiation on the degree of conversion (DC), water sorption (WS), and water solubility (WSB) of these bonding systems in an attempt to improve their physico-mechanical resistance. Material and Methods: Two bonding agents were tested: a two-step total-etch system [Adper™ Single Bond 2, 3M ESPE (SB)] and a universal system [Adper™ Single Bond Universal, 3M ESPE (SU)]. Square-shaped specimens were prepared and assigned into 4 groups (n=5): SB and SU (control groups - no laser irradiation) and SB-L and SU-L [SB and SU laser (L) - irradiated groups]...
July 2017: Journal of Applied Oral Science: Revista FOB
Yu-Chieh Chi, Yu-Fang Huang, Tsai-Chen Wu, Cheng-Ting Tsai, Li-Yin Chen, Hao-Chung Kuo, Gong-Ru Lin
Violet laser diode (VLD) based white-light source with high color rendering index (CRI) for lighting communication is implemented by covering with Y3Al5O12:Ce(3+) (YAG:Ce) or Lu3Al5O12:Ce(3+)/CaAlSiN3:Eu(2+) (LuAG:Ce/CASN:Eu) phosphorous diffuser plates. After passing the beam of VLD biased at 70 mA (~2I th ) through the YAG:Ce phosphorous diffuser, a daylight with a correlated color temperature (CCT) of 5068 K and a CRI of 65 is acquired to provide a forward error correction (FEC) certified data rate of 4...
September 5, 2017: Scientific Reports
Yu-Fang Huang, Yu-Chieh Chi, Hsuan-Yun Kao, Chen-Ting Tsai, Huai-Yung Wang, Hao-Chung Kuo, Shuji Nakamura, Ding-Wei Huang, Gong-Ru Lin
Up to 18-Gbps direct encoding of blue laser diode (BLD) is demonstrated for free-space data transmission. By reshaping the orthogonal frequency multiplexed (16-QAM OFDM) stream with sidelobe filtering, the raw data rate expedites from 17.2 to 18.4 Gbps. Employing an ultrafast p-i-n photodiode with smaller active area diameter and lower noise equivalent power significantly enlarges the data rate by 1.6 Gbps or upgrades the signal-to-noise ratio (SNR) by 0.2 dB. Replacing the 80-mW BLD with the 120-mW one essentially increases the received SNR by 0...
September 5, 2017: Scientific Reports
Vivian Galletta, Luciane Azevedo, Giovanni Lodi, Dante Migliari
INTRODUCTION: To analyze factors that may affect recurrence, development of new lesions, and malignant transformation in patients with oral leukoplakia (OL) following surgical treatment with lasers. MATERIALS AND METHODS: A total of 40 patients were enrolled in this study, 17 females (mean age of 64.5 years; 33-88 years) and 23 males (mean age of 56.6 years; 28-84 years) with an overall mean age of 60.5 years. A total of 49 lesions were diagnosed and treated; 9 patients had more than one site affected...
September 1, 2017: Journal of Contemporary Dental Practice
Seokjun Hong, Minjae Lee, Yeong-Dae Kwon, Dong-Il Dan Cho, Taehyun Kim
Ions trapped in a quadrupole Paul trap have been considered one of the strong physical candidates to implement quantum information processing. This is due to their long coherence time and their capability to manipulate and detect individual quantum bits (qubits). In more recent years, microfabricated surface ion traps have received more attention for large-scale integrated qubit platforms. This paper presents a microfabrication methodology for ion traps using micro-electro-mechanical system (MEMS) technology, including the fabrication method for a 14 µm-thick dielectric layer and metal overhang structures atop the dielectric layer...
August 17, 2017: Journal of Visualized Experiments: JoVE
Sean M Munier, Eric L Hargreaves, Nitesh V Patel, Shabbar F Danish
PURPOSE: Magnetic resonance-guided laser-induced thermal therapy (MRgLITT) is a minimally invasive procedure used to treat various intracranial pathologies. This study investigated the effects of variable power on maximal estimated thermal damage during ablation and duration required to reach maximal ablation. MATERIALS/METHODS: All ablations were performed using the Visualase Thermal Therapy System (Medtronic Inc., Minneapolis, Minnesota), which uses a 980-nm diffusing tip diode laser...
September 5, 2017: International Journal of Hyperthermia
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