Influence of the density gradient on the duration of Si-Kα pulses generated by a double femtosecond-laser pulse

Pisani, F.; Andiel, U.; Eidmann, K.; Witte, K.; Uschmann, I.; Morak, A.; Förster, E.; Sauerbrey, R.
April 2004
Applied Physics Letters;4/12/2004, Vol. 84 Issue 15, p2772
Academic Journal
We have studied the duration of Si-Kα x-ray pulses generated by two subsequent femtosecond-laser pulses (λ=395 nm, pulse duration=180 fs) separated by 20 ps, which were focused on a glass target to intensities of a few 1017 W/cm2. A toroidally bent crystal was used to image the Si-Kα pulses emitted by the target on the cathode of an ultrafast streak camera. While the duration of the first Kα pulse is 1.1 ps, the duration of the second Kα pulse is considerably longer by ≈0.7 ps. This effect is attributed to the preplasma created by the first laser pulse and seen by the second one. © 2004 American Institute of Physics.


Related Articles

  • Enhanced ablation of silica by the superposition of femtosecond and nanosecond laser pulses. Théberge, F.; Chin, S.L. // Applied Physics A: Materials Science & Processing;Apr2005, Vol. 80 Issue 7, p1505 

    We investigate the ablation process in SiO2 by the superposition of 180 fs laser pulse (?center=800 nm) with a 15 ns laser pulse (?center=532 nm). Compared to femtosecond laser pulses alone, we measured an increase of 270±30% in volume of the ejected material with only a total increase of 40%...

  • Propagation of terawatt laser pulses in the air. Roso, L.; San Román, J.; Sola, I. J.; Ruiz, C.; Collados, V.; Pérez, J. A.; Méndez, C.; Vázquez de Aldana, J. R.; Arias, I.; Plaja, L. // Applied Physics A: Materials Science & Processing;Sep2008, Vol. 92 Issue 4, p865 

    One of the problems when increasing the intensity of a femtosecond laser pulse is the propagation of the beam. As the intensity increases nonlinear effects begin to play a significant role. When arriving to the terawatt domain, nonlinear effects and filamentation give rise to a new phenomenology...

  • Blue 489-nm picosecond pulses generated by intracavity frequency doubling in a passively mode-locked optically pumped semiconductor disk laser. Casel, O.; Woll, D.; Tremont, M. A.; Fuchs, H.; Wallenstein, R.; Gerster, E.; Unger, P.; Zorn, M.; Weyers, M. // Applied Physics B: Lasers & Optics;Aug2005, Vol. 81 Issue 4, p443 

    We report the generation of blue 489-nm picosecond laser pulses by intracavity second-harmonic generation in a mode-locked optically pumped InGaAs vertical-external-cavity surface-emitting laser. Mode locking achieved by a semiconductor saturable absorber mirror generated 5.8-ps-long...

  • In situ characterization of high-intensity laser beams on OMEGA. Forties, R. A.; Marshall, F. J. // Review of Scientific Instruments;Jul2005, Vol. 76 Issue 7, p073505 

    This article details a means of inferring high-intensity laser beam shapes as applied to the 60-beam ultraviolet (UV) (351 nm) OMEGA laser system [T. R. Boehly et al., Opt. Commun. 133, 495 (1997)]. Measurements of the shape, location, and relative fluence of beams on the OMEGA laser system are...

  • Real-time characterization and optimal phase control of tunable visible pulses with a flexible compressor. Baum, P.; Lochbrunner, S.; Gallmann, L.; Steinmeyer, G.; Keller, U.; Riedle, E. // Applied Physics B: Lasers & Optics;2002 Supplement, Vol. 74 Issue 9, ps219 

    The output pulses of a noncollinearly phase-matched optical parametric amplifier (NOPA) are fully characterized by spectral phase interferometry for direct electric-field reconstruction (SPIDER). The SPIDER setup has been optimized for online diagnosis of tunable visible pulses with a 1 kHz...

  • Measurements of carrier-envelope phase changes of 100-Hz amplified laser pulses. Kakehata, M.; Fujihira, Y.; Takada, H.; Kobayashi, Y.; Torizuka, K.; Homma, T.; Takahashi, H. // Applied Physics B: Lasers & Optics;2002 Supplement, Vol. 74 Issue 9, ps43 

    We report measurements of the carrier-envelope phase (CEP) changes of 100-Hz amplified laser pulses through observation of the spectral interference between a white-light continuum generated by the self-phase modulation and its second harmonic (SH). The fluctuation of the time delay between the...

  • Laser-beam pulse shaping using spectral beam deflection. Skupsky, S.; Kessler, T. J.; Letzring, S. A.; Chuang, Y.-H. // Journal of Applied Physics;3/15/1993, Vol. 73 Issue 6, p2678 

    Presents a study which examined laser-beam temporal pulse shaping using a technique based on beam deflection. Theoretical background; Computational approach; Results.

  • Skin Effect, Ion-Acoustic Turbulence, and Anomalous Transport in a Nonisothermal Solid-State Plasma Generated by a High-Power Femtosecond Laser. Volkov, N. B. // Technical Physics Letters;Mar2001, Vol. 27 Issue 3, p236 

    We propose an interpretation of the experimental data reported by Milchberg, Freeman et al. on the absorption of intense 400-fs laser radiation pulses in an aluminum target. It is shown that the electric conductivity of a nonisothermal aluminum plasma possessing a solid-state density in these...

  • Attosecond pulses at last. Corkum, Paul // Nature;2/24/2000, Vol. 403 Issue 6772, p845 

    Focuses on the research of Papadogiannis et al measuring trains of attosecond laser pulses. Publication of the research in an issue of the `Physical Review Letter'; Approach used for generating attosecond pulses; Occurrence of short-wave harmonics at multiples of the frequency of the original...


Read the Article


Sorry, but this item is not currently available from your library.

Try another library?
Sign out of this library

Other Topics