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.
Dipole-dipole interactions between Rb atoms at internuclear distances 100-1000 Aring are probed at noncryogenic conditions, based on femtosecond laser parametric four wave mixing and wavepacket modulation. Theoretical analysis of the novel results is offered.
A synchronously pumped, fs-OPO with automated tuning in combination with an optimized scanner / microscope / detection system is used for MPE- and SHG microscopy on biological samples. The system and first results are presented.
We have demonstrated a beam scanning multi-photon multi-harmonic endoscope based on a flexible fiber bundle. Excited by a femtosecond Cr:Forsterite laser, multi-photon multi-harmonic excitation efficiencies are recovered without any external devices.
The intensity-related carrier-envelope phase dynamics of octave-spanning Ti:sapphire lasers is investigated. Taking the laser gain dynamics into account, quantitative agreement between the measured and predicted carrier-envelope phase noise resulting from pump laser noise is achieved.
We demonstrate generation of few-cycle THz pulses through optical rectification in organic DAST crystals at telecommunication wavelength (1550 nm). An extremely high conversion efficiency is achieved through velocity-matching and the materialpsilas large nonlinear optical susceptibility.
Long-range periodic nanoplane gratings written inside fused silica using a focused femtosecond laser beam can be erased and replaced with new gratings whose orientation is determined by the polarization of the femtosecond laser overwrite beam.
One-step femtosecond laser writing is used to make nanoporous capillaries inside fused silica. Laser-induced dye fluorescence shows penetration over millimeters. Fluid flow can be controlled through the porosity dependence on the laser writing parameters.
Two-dimensional multicolored arrays of quadratic spatial solitons and up-converted parametric amplifications are observed through cascaded non-collinear quadratic processes in quadratic media, which can be switched by phase-insensitive weak beam control with second harmonic seeding pulses.
We study the characteristic conical emission of a blue femtosecond filament in air. A significant improvement of the beam quality is obtained during the filamentation process.
A dramatic enhancement of harmonics and the extension of cutoff were observed in a linearly polarized two-color laser field below 10 nm. The intense soft X-ray supercontinuum provides an alternative for the attosecond generation.
Ultrafast electron dynamics in quasi-one-dimensional NbSe3 conductors was investigated by means of two-color pump-probe reflectivity measurements. The results clearly demonstrate the resonant probing of the charge-density-wave phases with different transition properties.
High harmonic generation in a gas filled capillary provides a high spatial coherence, collimated, soft x-ray source. We present simple diffraction measurements and theoretical simulations that demonstrate this coherence.
We have demonstrated 33 J amplification in Ti: sapphire at the record repetition rate of 0.1 Hz. For this, we have successfully removed transverse lasing in the large crystal amplifier and homogenized the laser pump profiles.
We describe measurements characterizing the interaction of ultra-high intensity Petawatt laser pulses with solid targets. Experiments were performed on the Petawatt laser at RAL, and the Titan laser at LLNL.
We measured the 4s 2S1/2 - 4p 2P1/2 and 4s 2S1/2 - 4p 2P3/2 transitions of potassium with an absolute accuracy better than 100 kHz. The isotopes 39, 40, and 41 are investigated in an atomic beam apparatus.
Hyperspectral Shack-Hartmann wavefront sensing based on a grating with integrated microaxicons is proposed. The capability to detect the spatio-spectral phase of ultrashort pulses is discussed. The generation of arrayed spectra is demonstrated for 10-fs pulses.
We present a very simple, linear, and general technique for measuring the complete electric field, E(x,y,z,t), of a single ultrashort laser pulse in a single interferogram containing multiple digital holograms simultaneously recorded at different wavelengths.
We present a new scheme of Ti:Sa laser amplification, based on second harmonic generation from a Ti:Sa laser tuned at 496 nm by an OPA system and amplification in an excimer double cavity.
We have designed a compact solid compressor by stimulated Brillouin scattering used in a fused silica glass. An 13 ns Nd:YAG laser pulse has been temporally compressed to a 1.2 ns pulse at 1064 nm.
The height, position, and even spacing of peaks in stepwise and direct multiphoton ionization spectra can be coherently controlled through the time delay or relative phase of two ultrashort laser pulses.
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.