Articles tagged with Laser Pulses
Scientists will focus laser light to reach the ultimate theoretical intensity limit, a million times beyond current state, to test quantum predictions near the Schwinger limit. The goal is to create experimental conditions to measure spontaneous particle-antiparticle pair creation in a vacuum.
Scientists use GHz-spaced femtosecond sub-pulses to alter the electronic and optical properties of amorphous gallium oxide without causing crystallization. The approach, called digital cold strain engineering, enables the preservation of the material's predominantly disordered structure.
A University of Maryland-led team will investigate how shaping intense laser pulses in space and time can control matter. The project aims to improve compact particle accelerators, generate radiation, and guide light through air.
Researchers demonstrated quantum coherent control in extreme ultraviolet light, enabling electron excitation and manipulation. The technique uses XUV pulses to create competing quantum routes, allowing for control over the outcome, and has potential applications in element-specific imaging and spectroscopy.
Scientists at the Universities of Jena and Regensburg have created an optical technique to study the quantum geometry of ultra-thin materials. By combining optical measurements with an analytical model, they were able to quantitatively estimate the local Berry curvature of the material, providing new insights into its behavior.
Researchers create 3D light fields to excite electrons into previously inaccessible quantum states, opening up new avenues for investigating chiral structures and controlling light-matter interactions. This approach could lead to advances in chiral sensing and molecular chirality studies.
Scientists have created a method to continuously tune X-ray light frequency, allowing for precise control over X-ray emission. By shifting the laser frequency, researchers can select exactly the energy needed, eliminating the need for fixed frequency settings.
Researchers at the ARC Centre for Transformative Meta-Optical Systems have developed a new method to manufacture wire-grid polarisers using kitchen foil, reducing production costs and time. The technique uses a nanosecond laser to carve a metal grid directly from the foil in just 15 seconds, making it a potential game-changer for the t...
A German research team has successfully generated stable laser pulses in the femtosecond range, allowing for the manipulation of individual electrons. The team's achievement enables the stability of the electric field oscillations across a wide range of timescales, from microseconds to hours.
Researchers at TU Wien and University of California San Diego have discovered a new quantum regime of coherent X-ray generation with higher energies, breaking the conventional energy cutoff limit. The effect is attributed to the interaction between two electrons in helium atoms, which release their energy simultaneously.
Scientists have developed a table-top technique using all-attosecond transient absorption spectroscopy to study the oscillatory motion of an electron vacancy in xenon ions. The results provide insights into the underlying dynamics of light-induced processes.
A nonvolatile phase-programmable spintronic terahertz emitter has been developed, allowing for ultrafast programming of terahertz wave phases. The device demonstrates reversible write-read-reset processes and spatial terahertz phase patterning with high signal-to-noise ratios.
Researchers developed a new method to observe nanoscale spin waves, directly detecting short-wavelength magnons using resonant soft X-rays. The technique, called magnon momentum microscopy (MMM), reveals strong nonlinear interactions and four-magnon scattering processes in magnetic materials.
Researchers at the University of Rochester developed a solar-thermal desalination process that produces fresh water in an energy-efficient way, eliminating brine and requiring no chemical additives. The technology extracts nearly 100% of salts in solid form, producing table salt and precious minerals like lithium.
Dual-comb spectroscopy enables precise, rapid, and broadband measurements using two optical frequency combs with slightly different repetition frequencies. This technique has been implemented across the electromagnetic spectrum, from terahertz to visible range, with ongoing efforts towards ultraviolet range.
Researchers have developed a new procedure to speed up elaborate computer simulations analyzing matter under extreme conditions. The method, which uses mathematical transformation into imaginary time, enables faster evaluation of X-ray scattering experiments, improving fields like fusion research and laboratory astrophysics.
Scientists confirm decades-long prediction by measuring the color-changing effect of light in chiral carbon nanotubes. The material converts light at a rate two to three orders of magnitude greater than conventional materials.
A team of international researchers observes and controls how angular momentum is transferred and conserved within a crystal lattice using terahertz laser pulses. The experiment reveals a surprising effect: during the angular momentum transfer, the direction of rotation reverses due to the rotational symmetry of the material.
A new laser method allows researchers to study radioactive elements like neptunium and fermium, which have rugby ball-shaped atomic nuclei. The technique provides crucial information about the size and shape of atomic nuclei, essential for understanding actinide properties.
The study measures ultrafast electron dynamics in hydrogen molecules, observing oscillations in hole localization that depend on the delay between attosecond pulses. Entanglement occurs at the expense of electronic coherence in the remaining ion.
Researchers at Lund University have developed a compact and elegant way to stretch ultrafast laser pulses using a diffraction grating, allowing for precise control over pulse duration. This enables full characterization in a single shot, without the need for pre-compensation optical elements.
Researchers have generated a 19.2-attosecond soft X-ray pulse, creating a camera capable of capturing elusive electron dynamics in unprecedented detail. This breakthrough enables direct observation of processes driving photovoltaics, catalysis, and emerging quantum devices.
Researchers at the Max Born Institute developed a laboratory-scale soft-X-ray instrument to study ultrafast processes of emergent textures in magnetic materials. They observed nanoscale magnetic maze domains and discovered complex reorganization patterns on picosecond to nanosecond timescales.
Researchers from two Max Planck Institutes directly observe the strong reshaping of C60 molecules by laser fields using x-ray camera. At low intensities, the molecule expands before fragmentation sets in, while at high intensities, fast expansion and removal of outer valence electrons occur.
Researchers have developed a new system that combines laser amplification and bandwidth, achieving 80% efficiency in a compact and versatile design. The system uses a multipass procedure to synchronize pulses and generate pulses shorter than 50 femtoseconds.
Scientists at Max Born Institute and DESY develop a plasma lens that focuses attosecond pulses, improving the study of ultrafast electron dynamics. The technique offers high transmission rates and allows for focusing light across different colors.
Scientists at Max Born Institute develop technique to generate µJ-level tunable few-fs UV pulses in VUV range. They successfully characterized few-fs pulses tuned between 160 and 190 nm using electron FROG, revealing pulse duration of 2-3 fs.
Researchers at Peking University and Hunan University have developed a method to generate powerful, structured terahertz pulses with programmable polarization textures. The team uses femtosecond laser pulses to drive magnetized plasma, creating Poincaré THz beams carrying spin and orbital angular momentum.
A team of scientists observed the earliest steps of ultrafast charge transfer in a complex dye molecule, with high-frequency vibrations playing a central role. The experiments showed that these vibrations initiate charge transport, while processes in the surrounding solvent begin only at a later stage.
Researchers at the University of Innsbruck have developed a versatile method to control dark excitons in semiconductor quantum dots using chirped laser pulses and magnetic fields. This allows for the storage and manipulation of excitons, enabling new opportunities for quantum memory control and entangled photon pair generation.
Scientists demonstrate ultrafast plasmon-enhanced magnetic bit switching, enabling faster and more robust memory devices. The study uses plasmonic gold nanostructures to confine light and achieve magnetization switching with single femtosecond laser pulses.
Researchers at Osaka Metropolitan University developed an autonomous driving algorithm for robots to navigate raised cultivation beds, utilizing lidar point cloud data. The system enables precise movement and accuracy in both virtual and actual environments, promising to expand tasks beyond harvesting to monitoring and pruning.
A Colorado State University team has achieved a new milestone in 3D X-ray imaging technology by capturing high-resolution CT scans of the interior of a large, dense object using a compact, laser-driven X-ray source. This breakthrough offers a fast and non-destructive way to obtain detailed views inside dense structures.
A German-Italian team has discovered a way to simplify the experimental implementation of two-dimensional electronic spectroscopy, allowing for real-time study of electron motion in solids. By adding an optical component to Cerullo's interferometer, researchers were able to control laser pulses more precisely, enabling the investigatio...
Scientists have discovered a way to turn ordinary liquids into epsilon-near-zero (ENZ) materials by interacting them with intense femtosecond laser pulses. This creates a new class of materials with tunable light propagation properties, opening up possibilities for advances in optical sensing and communication.
Researchers used time-delayed laser pulses to capture electric and magnetic field vectors of surface plasmon polaritons, revealing a meron pair's spin texture. The study demonstrates stable spin structures despite fast field rotations.
Researchers at Tata Institute of Fundamental Research have developed a novel method to steer relativistic electron pulses produced by femtosecond lasers. By using solid targets with nanopillars, they achieved coherent control over the electrons' directionality and formed narrow beams.
A team of researchers successfully demonstrated nonlinear Compton scattering using a multi-petawatt laser, producing ultra-bright gamma rays. The achievement offers new insights into high-energy electron-photon interactions without traditional particle accelerators.
Researchers at European XFEL and DESY develop self-chirping method to produce high-power attosecond hard X-ray pulses without reducing electron bunch charge. This enables non-destructive measurements at the atomic level and opens new avenues for studying matter at the atomic scale.
Researchers at TU Wien have developed computer simulations to investigate the temporal development of quantum entanglement. They found that the 'birth time' of an electron flying away from an atom is related to the state of the remaining electron, demonstrating a quantum-physical superposition.
Researchers at ETH Zurich have set a new record for the strongest laser pulses, surpassing previous records by over 50%, using a special arrangement of mirrors and a semiconductor mirror. The pulses can be used to create high harmonic frequencies up to X-rays, enabling fast processes in the attosecond range.
Scientists have created extremely thin sheets of nitrogen-vacancy (NV) centers in diamond crystals, which exhibit exceptional sensitivity to environmental variations. The findings reveal the emergence of Fröhlich polarons, previously thought not to exist in diamonds, opening up new prospects for quantum sensing.
Researchers at TU Wien have developed a new method to generate extremely short, powerful ion pulses for controlled analysis of material surfaces. These pulses can be used to observe chemical processes in real-time, providing insights into surface physics and chemistry on a picosecond time scale.
Researchers from Zhejiang University have developed a hybrid laser direct writing technique that enables the creation of functional copper interconnects and carbon-based sensors within a single integrated system. The process allows for real-time temperature monitoring over extended periods, ensuring optimal performance and reliability.
A new SERS microfluidic system was developed by Shanghai Jiao Tong University researchers, achieving a detection limit lower than 10 ppt of harmful substances. The system uses femtosecond laser-induced nanoparticle implantation into flexible substrate for sensitive and reusable microfluidics detection.
The TIFR team developed a method to measure the temporal shape of ultrashort laser pulses using spectral interferometry, enabling precise measurement of pulse profiles at different points across the beam. This breakthrough is essential for handling increasingly powerful lasers that emit pulses and can distort optical components.
A team of researchers has determined a fundamental spatial limit for light-driven magnetization reversal in nanometer-scale materials. They found that the minimum size for all-optical switching is around 25 nm due to ultrafast lateral electron diffusion, which rapidly cools illuminated regions.
Researchers found that chiral gold nanoparticles exhibit high selectivity for left- or right-handed circularly polarized light with a dissymmetry factor of approximately 0.7, outperforming previous materials. The findings suggest potential applications in anti-counterfeiting and quantum information using circularly polarized light.
Researchers have developed a non-invasive optical-acoustic imaging method using short laser pulses to create images of muscle tissue. This breakthrough technology has the potential to improve diagnosis and treatment of spinal muscular atrophy (SMA), a rare genetic disorder causing muscle degeneration.
Physicists from TU Darmstadt propose a new approach to define and measure the time required for quantum tunneling. They suggest using Ramsey clocks, which utilize the oscillation of atoms to determine the elapsed time. The proposed method may correct previous experiments that observed particles moving faster than light during tunneling.
Scientists have discovered a new way to transform an insulating material into a semimetal by exposing it to ultrafast laser pulses. This process alters the energy states and electron movement, temporarily creating a semimetallic state that can be used in devices with dynamic properties.
Scientists have developed a powerful tool to investigate molecular dynamics in real-time, tracing the evolution of gas-phase furan and uncovering its ring-opening dynamics. The technique, based on attosecond core-level spectroscopy, provides an extremely detailed picture of the relaxation process.
Researchers have developed a compact and lightweight single-photon airborne lidar system that can acquire high-resolution 3D images with a low-power laser. The system uses single-photon detection techniques to measure time-of-flight, enabling highly accurate 3D mapping of terrain and objects even in challenging environments.
The novel UV broadband spectrometer enables real-time analysis of air pollutants and their interaction with other gases and sunlight. It combines high spectral resolution, short measurement times, and large bandwidth, making it suitable for sensitive measurements and monitoring of gas concentrations.
Researchers have developed a visible-light mode-locked femtosecond fiber oscillator and amplifier, emitting red light at 635 nm. The device achieves a pulse duration of 199 fs and an average output power over 1 W.
Scientists from TIFRH successfully generate MeV temperature electrons at a fraction of the previously thought necessary laser intensity. The technique uses two laser pulses to create tiny explosions in microdroplets and accelerate electrons to megaelectronvolt energies.
The Institute for Molecular Science (IMS) is accelerating the development of novel quantum computers based on 'cold (neutral) atom' technology, leveraging expertise from 10 industry partners. The partnership aims to launch a start-up company and develop practical applications of quantum computers by end FY2024.
A team of researchers from the universities of Mainz, Olomouc, and Tokyo has successfully generated a logical qubit from a single light pulse that can correct errors. This breakthrough uses a photon-based approach to overcome the limitations of current quantum computing technology.
A team of researchers has identified the intrinsic interactions responsible for light-induced ferroelectricity in SrTiO3. By measuring fluctuations in atomic positions, they found that mid-infrared excitation suppresses certain lattice vibrations, leading to a more ordered dipolar structure.
The review discusses the optical aspects of QPAT, including mathematical models for light propagation and interaction with biological tissues. The authors outline two approaches to estimating chromophore concentrations from absorbed optical energy density data, highlighting the challenges associated with practical implementation, such ...