A short pulse of light incident on a waveguiding region with a periodic mixture of dielectric materials is shown to experience dramatic changes in its spatial and temporal composition. The reflected and transmitted pulse components experience lateral spread and temporal decompression, which depend on the pulse width, pulse duration, and the structural parameters of the resonant grating.
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http://dx.doi.org/10.1364/oe.10.000840 | DOI Listing |
Nanoscale Adv
January 2025
Energy Masteries Laboratory, Physics Department, School of Sciences and Engineering, The American University in Cairo New Cairo 11835 Egypt
Laser surface alloying of Fe, Si, and C on aluminium is demonstrated using a Q-switched Nd:YAG laser as the source of energy. The fundamental wavelength of the laser beam was 1064 nm with an output energy of 100 mJ and a pulse duration of 10 ns. The exposure was conducted in repetitive mode with a frequency rate of 1 Hz.
View Article and Find Full Text PDFiScience
January 2025
School of Science, Beijing University of Posts and Telecommunications, Beijing 100876, China.
Based on the nonlinear broadband saturation absorption, ultrafast carrier recovery rate, and ultrashort recovery time of new low dimensional materials, ultrafast photonics has rapidly developed as an interdisciplinary field. We have demonstrated multiple solitons state output in an erbium-doped fiber laser based on saturable absorption characteristic of AgInPS. By preparing AgInPS with a modulation depth of 10.
View Article and Find Full Text PDFJACC Case Rep
January 2025
Division of Cardiology, Electrophysiology Section, Adult Congenital Arrhythmia Clinic, Emory University, Atlanta, Georgia, USA.
Background: The atrial switch procedure is accompanied by a very high rate of sinus node dysfunction. Baffle stenosis is a common problem with transvenous pacemaker leads in this scenario.
Case Summary: We present a first-in-human case of a leadless pacer (LP) in the left atrium in a patient with prior atrial switch for transposition and sinus node dysfunction complicated by multiple abandoned leads, superior baffle occlusion, and failed extraction.
Alzheimers Dement (Amst)
January 2025
Introduction: We examined the associations of carotid intima-media thickness (CIMT), arterial stiffness index (ASI), and pulse pressure (PP) with cerebrovascular disease, cognitive function and decline, and incident cardiovascular diseases (CVD) and dementia in the UK Biobank cohort.
Methods: The study consisted of 42,711 participants (mean age 64.2 years) with brain magnetic resonance imaging (MRI), vascular assessments, and cognitive testing.
JACC Adv
February 2025
Department of Internal Medicine, National Taiwan University Hospital, Taipei, Taiwan.
Background: Clonal hematopoiesis of indeterminate potential (CHIP) has been linked to intensified systemic inflammation and represents a novel risk factor for atherosclerotic cardiovascular diseases, including aortic stenosis (AS).
Objectives: This study aimed to assess the clinical impact of CHIP in a cohort of severe AS patients undergoing transcatheter aortic valve implantation (TAVI).
Methods: We enrolled 110 severe AS patients in this retrospective study.
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