TITLE

Intense laser interactions with sprays of submicron droplets

AUTHOR(S)
Gumbrell, E. T.; Comley, A. J.; Hutchinson, M. H. R.; Smith, R. A.
PUB. DATE
April 2001
SOURCE
Physics of Plasmas;Apr2001, Vol. 8 Issue 4, p1329
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
Picosecond laser interaction experiments conducted at peak intensities of 1.5x10[sup 17] W cm[sup -2] using a new target medium consisting of a dense spray of 0.5 micron radius ethanol droplets indicate a strong laser-plasma coupling. The laser absorption exceeds that seen in solid targets of greater Z, and remains high over more than four orders of magnitude of intensity. Invariance in the laser absorption with wavelength and polarization is also reported. Together with x-ray spectroscopy studies, absorption measurements have been used to implement nonlocal thermodynamic equilibrium (NLTE) plasma simulations in order to isolate the important features of the droplet heating and explosion dynamics. These simulations show that the interplay of laser heating and energy transport processes is significantly different from those seen in continuous solid target interactions and that a substantial fast electron fraction must be inferred. © 2001 American Institute of Physics.
ACCESSION #
4716127

 

Related Articles

  • Magnetic instability by the relativistic laser pulses in overdense plasmas. Sentoku, Yasuhiko; Mima, Kunioki; Kojima, Shin-ichi; Ruhl, Hartmut // Physics of Plasmas;Feb2000, Vol. 7 Issue 2 

    The magnetic instability driven by the relativistic electron stream generated by ultra-intense laser is investigated with the help of a two-dimensional particle-in-cell simulation, which includes the relativistic binary collision. The linear growth rate of the instability is also studied using...

  • A plasma shutter to generate a synchronized subnanosecond pulse for optical probing of laser-produced plasmas. Dhareshwar, L. J.; Naik, P. A.; Bhawalkar, D. D. // Review of Scientific Instruments;Feb1991, Vol. 62 Issue 2, p369 

    A simple and reliable technique to temporally shorten a multinanosecond Nd:glass laser pulse to less than nanosecond duration at the second harmonic wavelength is described in this article. Using this technique a short probe pulse synchronized with the main laser was generated for optical...

  • Resonance absorption in high-intensity contrast, picosecond laser–plasma interactions[ATOTHER]@f|[/ATOTHER]. Meyerhofer, D. D.; Chen, H.; Delettrez, J. A.; Soom, B.; Uchida, S.; Yaakobi, B. // Physics of Fluids B: Plasma Physics;Jul93, Vol. 5 Issue 7, p2584 

    The interaction of high-intensity contrast, picosecond, 1-µm laser pulses with solid metal targets is studied with K[sub α] emission from multilayer targets, fast ion blowoff, and other diagnostics. It is found that the characteristics of the interaction are determined by the intensity of...

  • Soft x-ray emission from postpulse expanding laser-produced plasmas. Weaver, J. L.; Feldman, U.; Mostovych, A. N.; Seely, J. F.; Colombant, D.; Holland, G. // Review of Scientific Instruments;Dec2003, Vol. 74 Issue 12, p5076 

    A diagnostic spectrometer has been developed at the Naval Research Laboratory to measure the time resolved absolute intensity of radiation emitted from targets irradiated by the Nike laser. The spectrometer consists of a dispersive transmission grating of 2500 lines/mm or 5000 lines/mm and a...

  • Status of the LILAC experiment. Saleh, N.; Han, P.; Keppel, C.; Gueye, P.; Yanovsky, V.; Umstadter, D. // AIP Conference Proceedings;2001, Vol. 569 Issue 1, p127 

    We present the status of the LILAC experiment [1], including results on the propagation of 30-fs duration laser pulses in plasmas of the requisite density, and measurements of the dark current [2]. We also discuss the status of a laser upgrade, an electron beam line and plans for the future.

  • Enhancement of keV x-ray emission in laser-produced plasmas by a weak prepulse laser. Kodama, R.; Mochizuki, T.; Tanaka, K. A.; Yamanaka, C. // Applied Physics Letters;3/23/1987, Vol. 50 Issue 12, p720 

    X-ray conversion efficiency in a 0.53-μm laser-produced copper plasma is studied in the 1.5–5.0 keV range as a function of laser pulse duration (τL) with a laser intensity of 1×1014 W/cm2. The efficiency increases as τ1.3L at pulse lengths of less than 400 ps. For a 200-ps...

  • Characterization of Surface Plasma in Surface Harmonic Experiments using Satellite Structures in the Reflected Pump Spectrum. Ozaki, T.; Oguri, K.; Nishikawa, T.; Nakano, H. // AIP Conference Proceedings;2002, Vol. 641 Issue 1, p424 

    We investigate the spectral structure of high-intensity ultrashort laser pulses reflected from silicon target. The fundamental frequency spectrum involves complicated redshifts and blueshifts due to the laser-plasma interaction. On the other hand, we find that simulations accurately reproduce...

  • High energy negative ion generation by Coulomb implosion mechanism. Nakamura, T.; Fukuda, Y.; Yogo, A.; Tampo, M.; Kando, M.; Hayashi, Y.; Kameshima, T.; Pirozhkov, A. S.; Esirkepov, T. Zh.; Pikuz, T. A.; Faenov, A. Ya.; Daido, H.; Bulanov, S. V. // Physics of Plasmas;Nov2009, Vol. 16 Issue 11, p113106 

    Generation of high energy negative ions from laser plasmas by Coulomb implosion mechanism is investigated. When clusters or underdense plasmas are irradiated by an intense laser pulse, positive ions are accelerated inside the clusters or in the self-focusing channel by the Coulomb explosion....

  • Efficient Attosecond Phenomena in the Relativistic λ3 Regime. Naumova, Natalia; Nees, John; Mourou, Gerard // AIP Conference Proceedings;2006, Vol. 827 Issue 1, p65 

    Particle-in-cell simulations of relativistically strong laser pulses interacting with overdense plasma targets predict that coherent motion of electrons leads to the efficient generation of strong attosecond electromagnetic pulses and dense attosecond electron bunches. The optimal conditions for...

Share

Read the Article

Courtesy of THE LIBRARY OF VIRGINIA

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

Try another library?
Sign out of this library

Other Topics