The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
Terahertz radiation from two-color laser-produced plasma is studied with simultaneous measurements of absolute two-color phases, near-field plasma currents, and far-field THz radiation. This verifies the microscopic mechanism of terahertz radiation generation at various laser intensities.
We demonstrate that trapping of femtosecond laser pulses of relativistic intensity deep within nanowire arrays volumetrically heats matter into a new ultra-hot plasma regime with electron densities nearly 100 times critical and multi-keV temperatures.
We demonstrate single-shot, two-dimensional imaging of ultrafast phenomena using a streak camera and a tilted lenslet array. We derive conditions for parallax-free imaging and experimentally verify the geometry by observing scattering of femtosecond pulses.
Using a THz camera and THz bandpass filters, we measure the frequency-resolved beam profile emitted from a two-color air plasma. We observe a frequency-independent emission angle from the plasma.
We demonstrate utilization of femtosecond-duration laser pulses for two-photon-absorption LIF imaging of atomic species in nonequilibrium plasmas. Femtosecond excitation enables improved signal-to-noise ratio, suppression of photolytic interferences, kilohertz-rate imaging, and potential for collisional quenching-free measurements.
Great enhancement of random lasing emission in Nd3++ doped (Pb,La)(Zr,Ti)O3 ceramics were investigated upon exposing to plasma atmosphere. The diffusion of light, optical energy storage and increased scatterers play vital roles in the experimental results.
We perform spectroscopic characterization of graphite plasma to study the species responsible for high-order harmonics generation. We observed that visible region contains vibrational transitions of C2 and C3 molecules. Under the same conditions, we found shorter delays are favorable for intense HHG.
In this work, we theoretically and numerically demonstrate several new plasma filament-based structures used for increasing the angular and range resolution of microwave radar systems, and show that they can survive in adverse environments.
We show how tailored few-cycle lightwaves with near relativistic intensity (∼1018W/cm2) can be used to control the attosecond electron dynamics of plasma mirrors and to produce beam manifolds of fully synchronized attosecond EUV light pulses.
Our experiments produced betatron x-rays up to 80 keV from a laser-wakefield accelerator. Measurements, performed with stacked image plates spectrometers, provide simultaneous information on the beam profile and spectrum at various angles of observation.
Amplification of 3 ps pulses to >20GW in a 1Hz CO2 laser MOPA chain is described. Several ways and experimental progress towards increase of the peak power for 10 µm pulses are discussed.
The use of temporally shaped femtosecond laser pulses is shown to enable the control of ablation mechanisms in Sapphire ranging from gentle over strong ablation to explosive boiling.
Plasma guiding structures are generated with programmable axial density modulations using a Spatial Light Modulator (SLM). A coherent beam-combining scheme enables the sculpting of high power beams with modest energy passing through the SLM.
We study the dynamics of the plasma generated with 800nm filaments of 60fs in a pump-probe system in nitrogen cell. We see the effect of molecular revival and plasma dynamics on beam profile and spectrum.
Filaments in air, induced by pulse trains of four ultrashort pulses, each separated by the rotational revival time of nitrogen exhibit an increased degree of spectral broadening and collimation over the single pulse filament case.
Nanoclusters are strongly ionised at 1016 Wcm−2 to generate even MeV ions. In a dense cluster ensemble a near 100% charge reduction of the ions to form fast neutrals is demonstrated. Neutrals atom emission is quasi-directional and neutralisation is more effective along the laser polarization.
We examine the interaction of relativistic laser pulses with plasma channels formed in a nitrogen cluster jet. We observe creation of nearly pure N5+ plasma channels and ionization injected wakefield beams with energies >100 MeV.
We present the first CEP stable double-CPA laser system, producing 8 mJ, 22 fs pulses and featuring high temporal contrast (1011) for performing relativistic intensity laser-plasma interactions at 1 kHz repetition rate.
Highly efficient InGaN-based LEDs with embedded sidewall passivation cubic airvoids made by nanoimprint lithography were demonstrated. The LEDs with embedded airvoids exhibit a 45% enhancement of light output at 20 mA compared with conventional LEDs.
We introduce the use of femtosecond laser plasma spectroscopy in chemical imaging of Li-ion battery system components. Spatially resolved mapping of major and minor elements of Li-ion batteries is presented and correlated to electrochemical performance.
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.