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.
We present the new regime of high-order harmonics generation by multi-TW femtosecond lasers irradiating gas jet targets. We describe new results concerning the off-axis XUV harmonics emission, angular distribution and source size.
We demonstrate bright high harmonic generation driven by UV lasers with ultra-high conversion efficiency approaching 10−3 and ultra-narrow single-harmonic bandwidth of ∼0.2%. The enhanced flux results from improved phase-matching combined with stronger single-atom yield.
Line emission of N2 and time-resolved electron density are measured in a several centimeter long plasma column. Peak density is 6∗1015 cm−3 and emission from the second positive system of N2 is observed.
An XUV continuum supporting 280 as isolated attosecond pulses is generated in argon with a 200 mJ, 17 fs Ti:Sapphire laser using the GDOG technique. The energy of the XUV pulse is over 100 nJ at generation location.
We demonstrate electron diffraction from a polycrystalline aluminum foil sample using 100 keV electron bunches generated from laser-driven plasma wakefield. Our proof-of-principle experiment shows the potential of high repetition rate, low energy electron pulses from laser wakefield accelerators for ultrafast electron diffraction applications.
We report mid-infrared lasing around 3 μm from a single PbS subwavelength wire, with a cavity volume less than the wavelength cubed at 0.44 λ3. The maximal lasing temperature is 180 K under pulse operation.
We report a metamorphic GaSb-based laterally coupled distributed-feedback laser grown on a GaAs substrate that operates continuous wave at room temperature with a total output power of 40 mW.
A violet multi-mode diode laser and cavity ring-down spectroscopy were used to detect trace amounts of NO2. The laser excites multiple cavity modes, simplifying the detector alignment and making it less susceptible to vibration.
Microdisk lasers with active region made of type II GaSb/GaAs quantum dots on the GaAs substrate have been demonstrated. Lasing wavelengths near 1μm was achieved and longer photon lifetime from type II structure also observed.
We present experimental demonstration of a new technique for trace gas sensing by measuring changes in the compliance voltage spectrum of an external cavity quantum cascade laser due to intracavity absorbing species.
A feasibility study of chirped laser dispersion spectroscopy (CLaDS) with utilizing direct modulation of a quantum cascade laser instead of external modulators is presented. Optimization of laser parameters enables nearly single- and dual-sideband CLaDS operation.
Precision processing of a variety of materials, ranging from metals to dielectrics, has been demonstrated with a high degree of reliability and repeatability, at industrially feasible processing speeds.
A long path quantum cascade laser atmospheric methane sensor is demonstrated in an Arctic environment. The sensor has 0.5% precision for methane in 1s and an in-line N2O reference cell to account for system drift.
A spectrally broadened and compressed fraction of the 30 fs JETI-pulses is utilized for imaging the laser-plasma interaction with 6 fs time resolution. In case of LWFA the direct visualization of the plasma wave became possible.
GaSb-based type-I quantum-well diode lasers with two-cascade active region were designed and fabricated. The injection is achieved by means of tunnel junction between AlGaAsSb graded composition and InAs/AlSb chirped superlattice layers. The devices operate in continuous wave regime at room temperature and demonstrate twofold improvement of injection efficiency as compared to reference single cascade...
The NIF requires complex and precise targets to perform its mission. The most complicated of these are the indirect-drive cryogenic ignition targets. At the center of these targets is a ∼2 mm diameter capsule that is filled with hydrogen fuel-in most cases, a solid layer of a 50:50 equimolar mixture of deuterium and tritium in equilibrium with its vapor at 1.3–1.5 Kelvin below the triple point at...
A high-frequency (100kHz–1GHz) modulation of the quantum cascade laser amplitude and phase is presented. Plasma-effect tuning with coefficients in 0.5–1.7MHz/mA range is observed depending on bias current. Carrier dynamics effects appear at frequencies >100MHz.
We demonstrate single-mode distributed-feedback quantum cascade lasers at 4.75 μm with etched index-coupled surface gratings and spin-on dielectric infilling. We observe continuous wave laser emission at room temperature with 5 W of electrical power consumption.
We show that a localized and long-lived quasi-stationary gas density depression exists after filament-generated-plasma recombination. Its millisecond timescale dynamics is governed by thermal diffusion and has strong effects on high-repetition-rate filamentation and supercontinuum generation.
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.