Fizyka – to proste!

Author(s): Steve Gilbertson, Yi Wu, Sabih D. Khan, Michael Chini, Kun Zhao, Ximao Feng, and Zenghu Chang
Using a generalized version of double optical gating, we produced single isolated attosecond pulses with 2-mJ, 25-fs driving lasers. Temporal characterization revealed that the 160-as pulses are accompanied with very weak pre- and postpulses. The dependence of the extreme-ultraviolet spectrum on the…
[Phys. Rev. A 81, 043810] Published Tue Apr 13, 2010

Author(s): Milan Šindelka
We study the general problem of matter-laser interaction within the framework of nonrelativistic quantum electrodynamics, with particular emphasis on strong laser field effects. Consequently, we formulate a well-defined approximation leading in a straightforward manner toward the conventional semicl…
[Phys. Rev. A 81, 033833] Published Thu Mar 18, 2010

Author(s): S. Suntsov, D. Abdollahpour, D. G. Papazoglou, and S. Tzortzakis
We study, both experimentally and theoretically, the underlying physics of third-harmonic generation in air by a filamented infrared femtosecond laser pulse propagating through a thin plasma channel. It is shown that the recently observed more than two-order-of-magnitude increase of the efficiency o…
[Phys. Rev. A 81, 033817] Published Wed Mar 10, 2010

Author(s): S. Ramakrishna, Paul A. J. Sherratt, Anthony D. Dutoi, and Tamar Seideman
We address theoretically and numerically the possibility of observing ellipticity in high-order harmonic generation (HHG) from aligned molecules driven by linearly polarized fields—a subject of controversy in the recent literature with significant implications. To that end we develop a numerical m…

[Phys. Rev. A 81, 021802] Published Wed Feb 10, 2010

Author(s): D. B. Milošević
Experimentally observed strong enhancement of a single high-order harmonic in harmonic generation from low-ionized laser plasma ablation is explained as resonant harmonic generation. The resonant harmonic intensity increases regularly with the increase of the laser intensity, while the phase of the …
[Phys. Rev. A 81, 023802] Published Wed Feb 03, 2010

Author(s): D. B. Milošević
Experimentally observed strong enhancement of a single high-order harmonic in harmonic generation from low-ionized laser plasma ablation is explained as resonant harmonic generation. The resonant harmonic intensity increases regularly with the increase of the laser intensity, while the phase of the …
[Phys. Rev. A 81, 023802] Published Wed Feb 03, 2010

Author(s): Yuquan Wang (王玉铨), Deying Chen (陈德应), Yuanqin Xia (夏元钦), Rongwei Fan (樊荣伟), and Faming Lu (卢发铭)
Molecular wave functions are used to calculate the harmonic emission of diatomic molecules based on a time-dependent Schrödinger equation. Tunable effects are shown for both magnitudes and molecular-alignment-dependent properties of the harmonic emission with different electronic excited states or …
[Phys. Rev. A 81, 013830] Published Wed Jan 27, 2010

Author(s): Daniele Faccio, Carles Serrat, José M. Cela, Albert Farrés, Paolo Di Trapani, and Jens Biegert
The process of high-order harmonic generation in gases is numerically investigated in the presence of a few-cycle pulsed-Bessel-beam pump, featuring a periodic modulation in the peak intensity due to large carrier-envelope-phase mismatch. A two-decade enhancement in the conversion efficiency is obse…

[Phys. Rev. A 81, 011803] Published Fri Jan 08, 2010

Author(s): H. -C. Bandulet, D. Comtois, E. Bisson, A. Fleischer, H. Pépin, J. -C. Kieffer, P. B. Corkum, and D. M. Villeneuve
The process of high-order harmonic generation leads to the production of a train of attosecond-duration extreme ultraviolet (XUV) pulses, with one pulse emitted per optical half-cycle. For attosecond pump-probe experiments, a single, isolated attosecond pulse is preferable, requiring an almost conti…
[Phys. Rev. A 81, 013803] Published Tue Jan 05, 2010

Author(s): G. Sansone, E. Benedetti, J. P. Caumes, S. Stagira, C. Vozzi, M. Nisoli, L. Poletto, P. Villoresi, V. Strelkov, I. Sola, L. B. Elouga, A. Zaïr, E. Mével, and E. Constant
We demonstrate that the characteristics of the high-order harmonic spectra generated by few-cycle carrier-envelope phase-stabilized pulses can be finely adjusted by controlling the time-dependent ellipticity. The experimental measurements show evidence for the generation of single, pairs, and trains…
[Phys. Rev. A 80, 063837] Published Wed Dec 23, 2009