Propagation of ultrashort laser pulses in optically ionized gases

Morozov, A.; Luo, Y.; Suckewer, S.; Gordon, D. F.; Sprangle, P.
February 2010
Physics of Plasmas;Feb2010, Vol. 17 Issue 2, p023101
Academic Journal
Propagation of 800 nm, 120 fs laser pulses with intensities of 4×1016 W/cm2 in supersonic gas jets of N2 and H2 is studied using a shear-type interferometer. The plasma density distribution resulting from photoionization is resolved in space and time with simultaneously measured initial neutral density distribution. A distinct difference in laser beam propagation distance is observed when comparing propagation in jets of H2 and N2. This is interpreted in terms of ionization induced refraction, which is stronger when electrons are produced from states of higher ionization potential. Three dimensional particle-in-cell simulations, based on directly solving the Maxwell–Lorentz system of equations, show the roles played by the forward Raman and ionization scattering instabilities, which further affect the propagation distance.


Related Articles

  • Shaping of picosecond pulses for pumping optical parametric amplification. Fülöp, J. A.; Major, Z. S.; Horváth, B.; Tavella, F.; Baltuška, A.; Krausz, F. // Applied Physics B: Lasers & Optics;Mar2007, Vol. 87 Issue 1, p79 

    The use of temporally shaped pump pulses for optical parametric chirped-pulse amplification can increase the efficiency and suppress possible spectral distortions in this process. With this goal in mind a novel method for shaping narrowband picosecond pulses has been developed. The method is...

  • Multiple filamentation of non-uniformly focused ultrashort laser pulses. Hao, Z.Q.; Salamé, R.; Lascoux, N.; Salmon, E.; Maioli, P.; Kasparian, J.; Wolf, J.-P. // Applied Physics B: Lasers & Optics;Feb2009, Vol. 94 Issue 2, p243 

    We propose the impingement of non-uniform wavefront curvature as a simple way to improve the longitudinal homogeneity of the plasma density along filaments generated by ultrashort laser pulses. We characterize multiple filamentation of a multiterawatt beam with different wavefront curvatures...

  • Effect of plasma density scale length on the properties of bremsstrahlung x-ray sources created by picosecond laser pulses. Courtois, C.; Compant La Fontaine, A.; Landoas, O.; Lidove, G.; Méot, V.; Morel, P.; Nuter, R.; Lefebvre, E.; Boscheron, A.; Grenier, J.; Aléonard, M. M.; Gerbaux, M.; Gobet, F.; Hannachi, F.; Malka, G.; Scheurer, J. N.; Tarisien, M. // Physics of Plasmas;Jan2009, Vol. 16 Issue 1, pN.PAG 

    Results of an experimental study of multi-MeV bremsstrahlung x-ray sources created by picosecond laser pulses are presented. The x-ray source is created by focusing the short pulse in an expanding plasma obtained by heating a solid target with a time-delayed nanosecond laser beam. The...

  • Cross-phase modulation between lasers in a tunnel ionizing gas. Liu, C. S.; Pathak, Vishwa Bandhu; Tripathi, V. K. // Physics of Plasmas;May2009, Vol. 16 Issue 5, p053102 

    The phase modulation of a low power long pulse probe laser beam in a rapidly tunnel ionizing gas (helium) under a relativistic short pulse laser is investigated. The relativistic pulse creates a fast increasing plasma density at its front, far ahead of the intensity peak. The probe pulse sees...

  • Ultra-Intense Laser Pulse Absorption and Fast Particles Generation at Interaction with Inhomogeneous Foil Target. Andreev, A. A.; Okada, T.; Toraya, S. // AIP Conference Proceedings;2002, Vol. 634 Issue 1, p303 

    The absorption of a short laser pulse with duration 40 fs and the intensity more than 10[SUP18] W/cm[SUP2] at the interaction with foil targets is analyzed in the theory and particle-in-cell (PIC) simulations. Initially, foil target density distribution has a smooth gradient with a variable...

  • 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...


Read the Article


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

Try another library?
Sign out of this library

Other Topics