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.
Attosecond metrology has so far remained limited to Ti:Sa lasers combined with an active stabilization of the carrier-envelope phase (CEP), where the achievable photon energy is limited to ∼100eV. This is too low to access X-ray absorption edges of most second- and third-row elements which are central to chemistry, biology and material science. The quadratic scaling of the ponderomotive energy with...
We investigate the behavior of resonant-induced harmonics from tin using driving lasers with tunable wavelengths. The intensity of the resonant harmonic is suppressed by the tuning laser wavelength around 1.8μm to understand the interaction dynamics of continuum electron with the autoionizing states.
Carbon molecules are used to generate intense high-order harmonics using driving lasers with 0.8 μm–1.71 μm wavelengths. By driving plasma of reduced size (∼200μm) with 1.71μm laser, we could extend the cutoff to ∼70eV, while reducing the peak intensity by only ∼31%.
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.
We demonstrate large, continuous redshift of high-order harmonics generated from carbon plasma. These harmoinics also have high intensity stability, with the harmonic yield only doubling when increasing the driving laser intensity by ten times.
We observe continuous and strong redshift of high-order harmonics generated from carbon plasma, which may explain the high conversion efficiency that result from a resonance close to the pump laser wavelength.
We improve the efficiency and divergence of high-order harmonics from carbon plasma, which could be pumped with sub-mJ laser. This opens the possibility for high repetition rate experiments with intense attosecond pulses.
Generation of intense isolated attosecond pulses is of significant importance to explore new domains in attosecond science. Recently, we have demonstrated high-order harmonic generation (HHG) with high conversion efficiency using low-density plasma as the nonlinear medium [1,2], instead of gas. However, isolated attosecond pulses have yet to be demonstrated from plasma. In this work, we apply the...
We perform the first direct comparison between high-order harmonics generated from carbon plasma and from argon gas cell, and find that the former is ten times more intense than the latter.
We report the generation of extremely efficient (>; 10-4), multi -μJ high -order harmonics from graphitic carbon plasma, which spans over five harmonic orders. This broad bandwidth is ideal for generating intense single-cycle attosecond pulses.
We study high-order harmonic generation from plasma that are created from bulk carbon target. We obtained high-order harmonic energy in the multi-microjoule range for the 11th to the 17th harmonic. By analysing the target morphology and the plasma composition, we conclude that the intense harmonics from this bulk carbon target have the same origin as those from nanoparticles target.
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.