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Ramón González-Herranz, Estefania Hernandez García, Monica Granda-Rosales, Gustavo Eisenberg-Plaza, Jose Montojo Woodeson, Guillermo Plaza
OBJECTIVES/HYPOTHESIS: We analyzed the results of 10 patients treated by unilateral autologous temporal fascia graft, comparing the pre and post surgery results, as well as the appearance of the wave and the intervals until the re-appearance of it. STUDY DESIGN: Retrospective, clinical case series. METHODS: Subjective and objective evaluation was preoperatively and postoperatively performed, using laryngovideostroboscopy, the Voice Handicap Index-10, GRBAS (grade, roughness, breathiness, asthenia, and strain), harmonics to noise ratio, Jitter, Shimmer, phonatory range, maximum phonation time, and S/Z ratio in all patients...
August 14, 2018: Journal of Voice: Official Journal of the Voice Foundation
Tobias Kroh, Cheng Jin, Peter Krogen, Philip D Keathley, Anne-Laure Calendron, Jonathas P Siqueira, Houkun Liang, Edilson L Falcão-Filho, C D Lin, Franz X Kärtner, Kyung-Han Hong
We systematically study the efficiency enhancement of high-harmonic generation (HHG) in an Ar gas cell up to the soft X-ray (SXR) range using a two-color laser field composed of 2.1 μm (ω) and 700 nm (3ω) with parallel linear polarization. Our experiment follows the recent theoretical investigations that determined two-color mid-infrared (IR) pulses, mixed with their third harmonic (ω + 3ω), to be close to optimal driving waveforms for enhancing HHG efficiency in the SXR region [Jin et al., Nature Comm...
June 25, 2018: Optics Express
Zebin Zhu, Kai Ni, Qian Zhou, Guanhao Wu
A phase-stable dual-comb interferometer measures materials' broadband optical response functions, including amplitude, frequency, and phase, making it a powerful tool for optical metrology. Normally, the phase-stable dual-comb interferometer is realized via tight phase-locking methods. This paper presents a post-correction algorithm that can compensate for carrier wave phase noise and interferogram timing jitter. The compensating signal is a beat between two combs using a free-running continuous wave laser as an optical intermediary...
June 25, 2018: Optics Express
Huihui Cheng, Wenlong Wang, Yi Zhou, Tian Qiao, Wei Lin, Yuankai Guo, Shanhui Xu, Zhongmin Yang
Multi-gigahertz fundamental repetition rate, tunable repetition rate and wavelength, ultrafast fiber lasers at wavelengths of 1.0, 1.5, and 2.0 µm are experimentally demonstrated and summarized. At the wavelength of 1.0 µm, the laser wavelength is tuned in the range of 1040.1-1042.9 nm and the repetition rate is shifted by 226 kHz in a 3-cm-long all-fiber laser by controlling the temperature of the resonator. Compared with a previous work where the maximum average power was 0.8 mW, the power in this study is significantly improved to 57 mW under a launched pump power of 213 mW, thus achieving an optical-to-optical efficiency of 27%...
June 25, 2018: Optics Express
Elena Gofas-Salas, Pedro Mecê, Cyril Petit, Jessica Jarosz, Laurent M Mugnier, Aurélie Montmerle Bonnefois, Kate Grieve, José Sahel, Michel Paques, Serge Meimon
The design and performance of an adaptive optics flood illumination ophthalmoscope (AO-FIO) platform, based on eye motion and dynamic aberrations experimental analysis, are described. The system incorporates a custom-built real-time controller, enabling up to 70 Hz loop rate without jitter, and an AO-corrected illumination capable of projecting high-resolution features in the retina. Wide-field (2.7°×5.4°) and distortionless images from vessel walls, capillaries, and the lamina cribrosa are obtained with an enhanced contrast and signal-to-noise ratio, thanks to careful control of AO parameters...
July 10, 2018: Applied Optics
Sean O'Duill, M Omar Sahni, Stéphane Trebaol, Pascal Landais, L Bramerie, Stuart G Murdoch, Pascal Besnard, Liam P Barry
We provide numerical verification of a feed-forward, heterodyne-based phase noise reduction scheme using single-sideband modulation that obviates the need for optical filtering at the output. The main benefit of a feed-forward heterodyne linewidth reduction scheme is the simultaneous reduction of the linewidth of all modes of a mode-locked laser (MLL) to that of a narrow-linewidth single-wavelength laser. At the heart of our simulator is an MLL model of reduced complexity. Importantly, the main issue being treated is the jitter of MLLs and we show how to create numerical waveforms that mimic the random-walk nature of timing jitter of pulses from MLLs...
August 1, 2018: Applied Optics
Haroon Asghar, Ehsan Sooudi, John G McInerney
In this paper, we report stabilization of self-mode-locked two-section quantum-dash lasers on the widest range of delay using simultaneous optical injection and optical feedback. With continuous-wave optical injection, various wavelengths spanning a range from 1568 to 1578 nm were investigated and optimum wavelengths (1571.210 to 1572.710) yielding the narrowest RF linewidth and reduced timing jitter of slave laser were identified. In addition, the dependence of RF linewidth and pulse repetition rate on injected wavelength was further explored...
August 1, 2018: Applied Optics
Mengyi Duan, Ping Wang, Xiaoxia Liu, Yutao Li, Wenwen Chen, Ang Li
The average bit error rate (ABER) performance of low-density parity-check (LDPC)-coded orthogonal frequency-division multiplexing (OFDM) free-space optical communication system with K-ary quadrature amplitude modulation (QAM) and phase shift keying (PSK) modulation schemes is investigated over the composite Málaga fading channel with atmospheric attenuation and pointing errors considered. The probability density function and cumulative distribution function regarding the aggregated channel model are derived with the help of the generalized Gauss-Laguerre quadrature rule, the analytical ABER expressions for both QAM and PSK OFDM systems are then obtained...
July 1, 2018: Applied Optics
Mafalda Andrea, Mario Andrea, Maria Luísa Figueira
PURPOSE: Functional voice disorders (FVD) are multifactorial and may have a significant impact on the patients' quality of life (QOL). The aim of this study was to explore and analyze the relationship between the VHI scores, psychological variables, and objective voice measurements, and to develop a psychological and/or vocal acoustic model for the overall self-perceived evaluation of quality of life for three different types of FVD. METHODS: After ENT examination, 83 women were classified into three groups: psychogenic voice disorder (PVD = 39), primary muscle tension voice disorder (MTVD1 = 16), and secondary muscle tension voice disorder (MTVD2 = 28)...
August 16, 2018: European Archives of Oto-rhino-laryngology
Sami A Shakir, Timothy T Clark, Daniel S Cargill, Richard Carreras
The irradiance of a partially coherent light propagated under the influence of multiple random effects is shown to be the convolution of the irradiance propagated in a vacuum with the system's point spread function representing the random effects. This is true regardless of whether the propagation is far-field or not. We also show that the far-field irradiance of any laser system, regardless of complexity, can be expressed in terms of three basic parameters; laser power, field area, and a pupil factor. A general analytical formula for the far-field irradiance distribution for partially coherent laser sources of any complexity is derived...
June 11, 2018: Optics Express
Salih Yanikgonul, Victor Leong, Jun Rong Ong, Ching Eng Png, Leonid Krivitsky
Integrated photonics platforms are crucial to the development and implementation of scalable quantum information and networking schemes, but many such devices still rely on external bulk photodetectors. We report the design and simulation of a waveguide-based single-photon avalanche diode (SPAD) for visible wavelengths. The SPAD consists of a p-n junction implemented in a doped silicon waveguide, which is end-fire coupled to an input silicon nitride waveguide. We developed a 2D Monte Carlo model to simulate the avalanche multiplication process of charge carriers following the absorption of an input photon, and calculated the photon detection efficiency (PDE) and timing jitter of the SPAD...
June 11, 2018: Optics Express
Chan-Gi Jeon, Yongjin Na, Bong-Wan Lee, Jungwon Kim
We demonstrate a simple all-fiber photonic phase detector that can measure the phase (timing) difference between an optical pulse train and a microwave signal with subfemtosecond resolution and -60  dB-level amplitude-to-phase conversion coefficient. It is based on passive phase biasing of a Sagnac loop by the intrinsic phase shift of a symmetric 3×3 fiber coupler. By eliminating the necessity of magneto-optic components or complex radio frequency (RF) electronics for phase biasing of the Sagnac loop, this phase detector has potential to be implemented as an integrated photonic device as well...
August 15, 2018: Optics Letters
Shivani Bhatia, Haley Quinlan, Courtney McCracken, Eric W Price, Lokesh Guglani, Sumit Verma
INTRODUCTION: Clinical and electrophysiological studies to measures disease activity in juvenile myasthenia gravis (JMG) are limited. METHODS: Retrospective review of the clinical profile, Myasthenia Gravis Foundation of America (MGFA) scores, serial stimulated jitter analysis (Stim-JA) of the orbicularis oculi muscle, grip strength, and spirometry of JMG patients followed in a multidisciplinary clinic was performed. RESULTS: Thirteen JMG subjects (9 females), mean age of 13...
August 14, 2018: Muscle & Nerve
Lauren Vogel
No abstract text is available yet for this article.
August 13, 2018: CMAJ: Canadian Medical Association Journal, Journal de L'Association Medicale Canadienne
Roeland Eppenga, Koert Kuhlmann, Theo Ruers, Jasper Nijkamp
PURPOSE: To evaluate the applicability of the Calypso® wireless transponder tracking system (Varian Medical Systems Inc., USA) for real-time tumor motion tracking during surgical procedures on tumors in non-rigid target areas. An accuracy assessment was performed for an extended electromagnetic field of view (FoV) of 27.5 × 27.5 × 22.5 cm (which included the standard FoV of 14 × 14 × 19 cm) in which 5DOF wireless Beacon® transponders can be tracked. METHODS: Using a custom-made measurement setup, we assessed single transponder relative accuracy, absolute accuracy and jitter throughout the extended FoV at 1440 locations interspaced with 2...
August 11, 2018: International Journal of Computer Assisted Radiology and Surgery
H J Snijders, J A Frey, J Norman, H Flayac, V Savona, A C Gossard, J E Bowers, M P van Exter, D Bouwmeester, W Löffler
We observe the unconventional photon blockade effect in quantum dot cavity QED, which, in contrast to the conventional photon blockade, operates in the weak coupling regime. A single quantum dot transition is simultaneously coupled to two orthogonally polarized optical cavity modes, and by careful tuning of the input and output state of polarization, the unconventional photon blockade effect is observed. We find a minimum second-order correlation g^{(2)}(0)≈0.37, which corresponds to g^{(2)}(0)≈0.005 when corrected for detector jitter, and observe the expected polarization dependency and photon bunching and antibunching; close by in parameter space, which indicates the abrupt change from phase to amplitude squeezing...
July 27, 2018: Physical Review Letters
André Vicente Guimarães, Rogério Aparecido Dedivitis, Leandro Luongo Matos, Felipe Toyama Aires, Claudio Roberto Cernea
A therapeutic decision in the treatment of Tis/T1a glottic carcinoma with radiotherapy (RT) or transoral laser surgery (TOS) is still an open issue. Oncologic outcome and voice quality may support the choice for the latter To conduct a systematic review and meta-analysis to compare oncologic and functional outcomes of TOS and RT as treatment options for Tis/T1a glottic cancer. Literature research on online databases was carried out. Potentially eligible articles were reviewed. Relevant articles were selected and evaluated...
August 9, 2018: Scientific Reports
Kemal Şafak, Ming Xin, Michael Y Peng, Franz X Kärtner
Filming atoms in motion with sub-atomic spatiotemporal resolution is one of the distinguished scientific endeavors of our time. Newly emerging X-ray laser facilities are the most likely candidates to enable such a detailed gazing of atoms due to their angstrom-level radiation wavelength. To provide the necessary temporal resolution, numerous mode-locked lasers must be synchronized with ultra-high precision across kilometer-distances. Here, we demonstrate a metronome synchronizing a network of pulsed-lasers operating at different center wavelengths and different repetition rates over 4...
August 9, 2018: Scientific Reports
Tom Karlsen, Lorentz Sandvik, John-Helge Heimdal, Hans Jørgen Aarstad
OBJECTIVES: Patients with voice-related disorders are ideally treated by a multidisciplinary team. Acoustic voice analysis and patient-reported outcome measures are recommended parts of the clinical assessment. The present paper aims at further documenting the importance of acoustic voice analyses, maximum phonation time (MPT) and Voice Handicap Index (VHI) into clinical investigations. STUDY DESIGN: The participants (N = 80 larynx cancer, N = 32 recurrent palsy, N = 23 dysfunctional, N = 75 degenerative/inflammation (N = 19 various excluded)) were included consecutively at the outpatient laryngology clinic at Haukeland University Hospital...
August 6, 2018: Journal of Voice: Official Journal of the Voice Foundation
Robert Burkard, James J Finneran, Jason Mulsow
The purpose of the present study was to compare auditory brainstem responses (ABRs) using two approaches that allow the use of high stimulation rates, but with different temporal variability in the interstimulus interval: maximum length sequences (MLS) and iterative randomized stimulation and averaging (I-RSA). ABRs were obtained to click stimuli in six bottlenose dolphins (Tursiops truncatus). In experiment 1, click level was held constant and click rate varied from 25 to 1250 Hz. For MLS, interstimulus intervals varied by a factor of 6 at each rate, while for I-RSA the interstimulus intervals varied by ± 0...
July 2018: Journal of the Acoustical Society of America
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