It is shown that a nonlinear polarization interferometer and a chirped mirror enable enhancement of the contrast of high-power laser pulses with a duration of tens and hundreds of femtoseconds by several orders of magnitude and simultaneously a several-fold reduction of their duration. Different variants of interferometers based on cubic nonlinearity in KDP and DKDP crystals are considered. The interferometer and chirped mirror parameters are optimized aimed at enhancing the peak power of the compressed pulse.
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http://dx.doi.org/10.1364/OE.447635 | DOI Listing |
J Clin Gastroenterol
January 2025
Department of Gastroenterology and Hepatology, University Hospitals Leuven, Leuven, Belgium.
Background: Swallowed topical corticosteroids (STC) are an effective first-line therapy for patients with eosinophilic esophagitis (EoE), both for induction and maintenance of remission. All interventional trials with STC used twice-daily dosing regimens. However, in other inflammatory gastrointestinal disorders, corticosteroids are given once daily (OD) with equal outcomes and improved compliance.
View Article and Find Full Text PDFMater Horiz
January 2025
State Key Laboratory of Organic-Inorganic Composites, College of Materials Science and Engineering, Beijing University of Chemical Technology, Beijing 100029, China.
Solar energy sources have garnered significant attention as a renewable energy option. Despite this, the practical power conversion efficiency (PCE) of widely used silicon-based solar cells remains low due to inefficient light utilization. In this study, carbon dots (APCDs) were prepared a hydrothermal method using ammonium polyphosphate and -phenylenediamine, then incorporated into a silicone-acrylic emulsion (CAS) to create a luminescent down-shifting (LDS) layer for solar cells.
View Article and Find Full Text PDFWave mixing (WM) techniques are crucial for applications such as supercontinuum generation, frequency conversion, and high-dimensional quantum encoding. However, their efficiency is often limited by complex phase-matching requirements, and current insights into phase-matching mechanisms for high-order WM remain limited. To address this, compact optical path configurations with high-peak-power, synchronous, multicolor ultrafast laser sources are needed to enhance high-order wave-mixing efficiency.
View Article and Find Full Text PDFWe present a wideband rectifying metasurface (RMS) with enhanced system efficiency for wireless power transmission and energy harvesting. The RMS consists of periodic arrays with integrated diodes, with a high input impedance matched with the diodes, thus eliminating the matching network between metasurface (MS) and rectifier. Besides, a unique harmonic feedback network is embedded in each unit cell, rectifying the high-order harmonic generated by the diode repeatedly, improving the total efficiency over a wide bandwidth.
View Article and Find Full Text PDFWe report a high peak power mid-infrared (MIR) source via efficient optical parametric generation (OPG) in a piece of 50-mm-long MgO: PPLN crystal pumped by using a near-infrared (NIR) narrow-band picosecond laser source. The highest peak power of the idler pulse can reach ∼109.86 kW with a duration of ∼7.
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