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diode laser

Hsiao-Chin Lee, Chien-Ming Fan Chiang, Po-Yi Wu, Yung-Chi Yao, Monima Sarma, Zu-Po Yang, Hai-Ching Su, Ya-Ju Lee, Ken-Tsung Wong
Recently, the control of correlated color temperature (CCT) of artificial solid-state white-light sources starts to attract more attention since CTs affect human physiology and health profoundly. In this work, we proposed and demonstrated a method that can widely tune the CCTs of electroluminescence (EL) from white-light-emitting electrochemical cells (LECs) by employing plasmonic filters. These integrated on-chip plasmonic filters are composed of semicontinuous thin Ag film or Ag nanoparticles (NPs) both included in the indium tin oxide anode contact, which have different characteristics of plasmonic resonant absorptions that can tune the EL spectra of white LECs...
November 23, 2016: ACS Applied Materials & Interfaces
Ryohei Morimoto, Taichi Goto, John Pritchard, Hiroyuki Takagi, Yuichi Nakamura, Pang Boey Lim, Hironaga Uchida, Mani Mina, Takunori Taira, Mitsuteru Inoue
A 10-mm cavity length magnetooptically Q-switched Nd:GdVO4 laser was demonstrated using a single-crystalline ferrimagnetic rare-earth iron garnet film. To design the Q-switching system, the magnetic, optical, and magnetooptical properties of the garnet film were measured. The diode pumped solid-state laser cavity was constructed using a 190-μm-thick garnet film with 58% transmittance. The garnet film had maze-shaped magnetic domains, and the domain walls disappeared when a field of over 200 Oe was applied...
December 8, 2016: Scientific Reports
J-N Carneiro-Neto, J-D-S de-Menezes, L-B Moura, E-M-S Massucato, C-R de-Andrade
BACKGROUND AND OBJECTIVE: Considering the high possibility of dentist consult a patient with oral complications of chemotherapy and/or radiotherapy for oral cancer because of the advances in this area, this study aims to systematically review the literature to identify and suggest effective and safe protocols for the managements of oral complications in oncology patients. MATERIAL AND METHODS: The systematic review was designed by PICO and PRISMA including eligibility and exclusion criteria; the source of information and search strategy in PubMed according MeSH: "Mouth Neoplasms and Radiotherapy" and "Mouth Neoplasms and Drug Therapy" the period from 2010 to 2015; selection and data collection of study was carried form blind and independently by two researchers; risk of bias and methodological quality: ensured by the PEDro scale; synthesis of data: of oral complications were evaluated by adapted version of associative direction classification proposed by Costigan and collaborators; and data analysis was performed by the meta-analysis of BioEstat program (5...
December 6, 2016: Medicina Oral, Patología Oral y Cirugía Bucal
Sara Al-Waisawy, Anthony F George, Wojciech M Jadwisienczak, Faiz Rahman
High quality white light-emitting diodes (LEDs) employ multi-component phosphor mixtures to generate light of a high color rendering index (CRI). The number of distinct components in a typical phosphor mix usually ranges from two to four. Here we describe a systematic experimental technique for starting with phosphors of known chromatic properties and arriving at their respective proportions for creating a blended phosphor to produce light of the desired chromaticity. This method is applicable to both LED pumped and laser diode (LD) pumped white light sources...
December 5, 2016: Luminescence: the Journal of Biological and Chemical Luminescence
E Pasch, M N A Beurskens, S A Bozhenkov, G Fuchert, J Knauer, R C Wolf
This paper describes the design of the Thomson scattering system at the Wendelstein 7-X stellarator. For the first operation campaign we installed a 10 spatial channel system to cover a radial half profile of the plasma cross section. The start-up system is based on one Nd:YAG laser with 10 Hz repetition frequency, one observation optics, five fiber bundles with one delay line each, and five interference filter polychromators with five spectral channels and silicon avalanche diodes as detectors. High dynamic range analog to digital converters with 14 bit, 1 GS/s are used to digitize the signals...
November 2016: Review of Scientific Instruments
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
B L Fan, W Xiong, S G Wang, L J Wang
We demonstrate a method to stabilize laser frequency which can be continuously tuned over a range of 1.5 GHz. It is based on saturated absorption spectroscopy (SAS) generated by an external-cavity diode laser (ECDL) which is modulated by an electro-optic amplitude modulator (EO-AM). The spectra consist of not only the original peaks corresponding to resonant and crossover lines of (133)Cs D2 line, but also signals introduced by sidebands from an EO-AM. Thus, the laser frequency can be locked to any point within the range of the spectra...
November 2016: Review of Scientific Instruments
P Shi, J Chen, L Gao, Y Liu, H Liu, Y N Zhou, G Zhuang
The multi-channel three-wave polarimeter-interferometer system on J-TEXT tokamak has been exploited to measure far-forward collective scattering from electron density fluctuations. The diagnostic utilizes far infrared lasers operated at 432 μm with 17-channel vertical chords (3 cm chord spacing), covering the entire cross section of plasma. Scattering laser power is measured using a high-sensitivity Schottky planar diode mixer which can also detect polarimetric and interferometric phase simultaneously. The system provides a line-integrated measurement of density fluctuations with maximum measurable wave number: k⊥max ≤ 2 cm(-1) and time response up to 350 kHz...
November 2016: Review of Scientific Instruments
Tong Liu, Shengping Chen, Xue Qi, Jing Hou
A high-power transverse-mode-switchable all-fiber picosecond laser in a master-oscillator power-amplifier (MOPA) configuration is demonstrated. The master oscillator is a gain-switched laser diode delivering picosecond pulses with 25 MHz repetition rate at the wavelength of 1.06 μm. After multi-stage amplification in ytterbium-doped fibers, the average output power is scaled to 117 W. A mechanical long-period grating is employed as a fiber mode convertor to achieve controllable conversion from the fundamental (LP<sub>01</sub>) to the second-order (LP<sub>11</sub>) mode...
November 28, 2016: Optics Express
Xiutao Lou, Tie Zhang, Hongze Lin, Shiyi Gao, Lianjie Xu, Junnan Wang, Li Wan, Sailing He
We demonstrate a second-harmonic-generation (SHG) based method for the detection of gaseous elemental mercury by using a newly available green diode laser. Multimode ultraviolet radiation at 253.7 nm is generated through a process of SHG. Correlation spectroscopy is introduced into the scheme to guarantee the measurement accuracy. The limit of detection achieved is 0.6 μg/m<sup>3</sup> (0.07 ppb) for 1-m pathlength and 10-s integration time. The measurement accuracy is estimated to be 1.2%. The linear response range is estimated to be 0~60 μg/m<sup>2</sup> (6...
November 28, 2016: Optics Express
Joshua Yablon, Zifan Zhou, Minchuan Zhou, Ye Wang, S Tseng, M S Shahriar
We have demonstrated experimentally a Diode-Pumped Alkali Laser (DPAL) with a Raman resonance induced dip in the center of the gain profile, in order to produce an anomalous dispersion, necessary for making the laser superluminal. Numerical calculations match closely with experimental results, and indicate that the laser is operating superluminally, with the group index far below unity (~0.00526) at the center of the dip. The estimated factor of enhancement in the sensitivity to cavity length perturbation is ~190, approximately equaling the inverse of the group index...
November 28, 2016: Optics Express
Dong K Shin, Bryce M Henson, Roman I Khakimov, Jacob A Ross, Colin J Dedman, Sean S Hodgman, Kenneth G H Baldwin, Andrew G Truscott
We have developed and characterised a stable, narrow linewidth external-cavity laser (ECL) tunable over 100 nm around 1080 nm, using a single-angled-facet gain chip. We propose the ECL as a low-cost, high-performance alternative to fibre and diode lasers in this wavelength range and demonstrate its capability through the spectroscopy of metastable helium. Within the coarse tuning range, the wavelength can be continuously tuned over 30 pm (7.8 GHz) without mode-hopping and modulated with bandwidths up to 3 kHz (piezo) and 37(3) kHz (current)...
November 28, 2016: Optics Express
G M Thomas, A Minassian, X Sheng, M J Damzen
We present the first study of Q-switched Alexandrite lasers under continuous-wave diode-pumping with operation up to 10 kHz repetition rates in TEM<sub>00</sub>, with spatial quality M<sup>2</sup> 1.15. With a pulsed-diode dual-end-pumped design, pulse energy is scaled to a record level of 3 mJ. We also demonstrate, for the first time, cavity-dumped Q-switching of diode-pumped Alexandrite lasers under continuous-wave and pulsed diode-pumping, up to 10 kHz. Pulse energy of 510 μJ is demonstrated with 3 ns pulse duration and 170 kW peak power, in TEM<sub>00</sub> with M<sup>2</sup> < 1...
November 28, 2016: Optics Express
Huan Zhan, Qinyong Liu, Yuying Wang, Weiwei Ke, Li Ni, Xiaolong Wang, Kun Peng, Cong Gao, Yuwei Li, Honghuan Lin, Jianjun Wang, Feng Jing, Aoxiang Lin
With home-made fiber perform and special fiber drawing & coating technique, a new-type of (3 + 1) GTWave fiber theoretically designed for bi-directional pump method, was successfully fabricated and justified of integrating multi-kW pump energy from commercial 976nm laser diodes. This (3 + 1) GTWave fiber amplifier demonstrated uniform absorption of pump light and easy thermal management characteristics along the whole fiber length. This amplifier is capable of simultaneously aggregating 5.19kW pump power at 976nm and finally generating 5...
November 28, 2016: Optics Express
Zhifeng Shi, Ying Li, Yuantao Zhang, Di Wu, Tingting Xu, Baolin Zhang, Lei Liang, Xinjian Li, Guotong Du
Electrically driven ultraviolet lasing was realized in two-dimensional ZnO nanowall networks from Au/MgO/n-ZnO/n-GaN/In structure, and whispering gallery type resonant modes are responsible for the lasing action. We present a comparative study on lasing action based on nanowall networks with different micro-hole sizes. The representative diode (Device II) with a moderate micro-hole size exhibits an ultralow threshold current density of 1.01  A/cm<sup>2</sup>, and the lasing action can be sustained at a temperature up to ∼413  K, showing a good temperature tolerance...
December 1, 2016: Optics Letters
Elijah Dale, Mahmood Bagheri, Andrey B Matsko, Clifford Frez, Wei Liang, Siamak Forouhar, Lute Maleki
We report on the stabilization of a high-power distributed feedback (DFB) semiconductor laser operating at 2.05 μm wavelength, using a crystalline whispering gallery mode microresonator. The laser's frequency noise is measured to be below 100  Hz/Hz<sup>1/2</sup> at Fourier frequencies ranging from 10 Hz to 1 MHz. The instantaneous linewidth of the laser is improved by four orders of magnitude compared with the free-running DFB laser, and is measured to be 15 Hz at 0.1 ms measurement time...
December 1, 2016: Optics Letters
Alberto Sottile, Eugenio Damiano, Mauro Tonelli
We report on, to the best of our knowledge, the first growth, spectroscopy, and laser operation of monocrystalline Ba(Y<sub>0.8</sub>Lu<sub>0.2</sub>)<sub>2</sub>F<sub>8</sub> doped with 1.25 at.% of Pr<sup>3+</sup> ions (Pr:BYLF). We studied the spectroscopic properties of this material, particularly in comparison with its isomorph Pr<sup>3+</sup>: BaY<sub>2</sub>F<sub>8</sub> (Pr:BYF). Under diode-pumped excitation, we achieved continuous-wave laser operation in the orange, red, and deep red regions in the three possible crystal orientations...
December 1, 2016: Optics Letters
Behzad Amoozgar, Eileen N Phan, Shan C Lin, Ying Han
PURPOSE OF REVIEW: There are currently various options available for glaucoma treatment procedures ranging from laser to penetrating to nonpenetrating surgeries. Innovations in glaucoma surgical therapeutics include features such as external application, focused tissue effects, and minimal manipulation as these factors all help lower the risk of side-effects in addition to increasing the success rate of the treatment. Traditional diode laser transscleral cyclophotocoagulation (TSCPC) is invasive and destructive...
November 25, 2016: Current Opinion in Ophthalmology
Nathali Cordeiro Pinto, Pablo Maria Alberto Pomerantzeff, Alessandro Deana, Denise Zezell, Carolina Benetti, Vera Demarchi Aiello, Luciana Almeida Lopes, Fabio Biscegli Jatene, M Cristina Chavantes
BACKGROUND AND OBJECTIVES: The most common injury to the heart valve with rheumatic involvement is mitral stenosis, which is the reason for a big number of cardiac operations in Brazil. Commissurotomy is the traditional technique that is still widely used for this condition, although late postoperative restenosis is concerning. This study's purpose was to compare the histological findings of porcine cusp mitral valves treated in vitro with commissurotomy with a scalpel blade to those treated with high-power laser (HPL) cutting, using appropriate staining techniques...
November 30, 2016: Photomedicine and Laser Surgery
Ye-Kyu Park, Choong-Hak Park
OBJECTIVE: The management of cervical intraepithelial neoplasia (CIN) and early invasive cancer of the uterine cervix is very difficult to approach, especially in case of young woman who wants to preserve her fertility. Conization of the cervix may have various kinds of disadvantage. The objective of this clinical retrospective study is to investigate the therapeutic effects and clinical efficacy of photodynamic therapy (PDT) including combined chemo-photodynamic therapy in patients with pre-malignant CIN and malignant invasive cervical cancer...
November 2016: Obstetrics & Gynecology Science
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