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  • 1
    Digitale Medien
    Digitale Medien
    Subpicosecond KrF*-laser plasma interaction at intensities between 1014 and 1017 W/cm2 (1996)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Plasmas 3 (1996), S. 2679-2685 
    Details
    ISSN: 1089-7674
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: The interaction of high-intensity subpicosecond KrF*-laser pulses with aluminium plasmas is investigated at intensities between 1014 and 1017 W/cm2. Using a one-dimensional hydrocode, the laser energy absorption and time evolution of plasma parameters have been studied as a function of laser intensity, incidence angle, and polarization. Complementary particle-in-cell simulations have also been performed to check the collisionless absorption component carried by hot electrons and ions. These simulations are compared to previous experiments on laser pulse absorption and x-ray generation. © 1996 American Institute of Physics.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.871525
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  • 2
    Digitale Medien
    Digitale Medien
    Reflectivity of laser-produced plasmas generated by a high intensity ultrashort pulsef| (1994)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Plasmas 1 (1994), S. 1635-1642 
    Details
    ISSN: 1089-7674
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: Solid state density aluminum and carbon plasmas were generated by 350 fs KrF laser pulses at intensities of 1017 W cm−2. Reflectivity, x-ray emission, and spectra of the backscattered radiation were measured as a function of the laser polarization, angle of incidence, and intensity (I). For p-polarized light, the absorption (A) is almost intensity independent for 1015 W cm−2〈I〈2×1017 W cm−2, and can reach values up to A=0.8. For constant laser intensity, p-polarized light is up to a factor of 15 more efficient in generating x rays than s-polarized light. A polarization and angle of incidence-dependent absorption mechanism, such as resonance absorption or vacuum heating, is consequently important. The spectral line shape and positions of the reflected radiation from the carbon plasma showed a substantial intensity dependence. It is demonstrated that the backscattered spectrum is influenced by the plasma expansion (Doppler effect) and the temporal development of the electron density.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.870665
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  • 3
    Digitale Medien
    Digitale Medien
    X-ray spectra from high-intensity subpicosecond laser produced plasmas (1995)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Plasmas 2 (1995), S. 972-981 
    Details
    ISSN: 1089-7674
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: The interaction of high-intensity subpicosecond KrF*-laser pulses with aluminum plasmas has been investigated. The laser pulse absorption and the x-ray production have been related at a series of intensities up to 1017 W/cm2 and different angles of incidence. Soft x-ray spectra were measured in the wavelength range from 7 to 150 A(ring) with various spectrographs. The spectra show distinct dependences on the laser intensity, the polarization, and the angle of incidence. The observed dependence of the spectra on the intensity and on the angle of incidence is the result of both the angular dependence of the laser pulse absorption and that of the conversion efficiency of the absorbed energy into soft x-ray emission. The spectra are influenced by the size of the absorption volume, the electron density where the absorption mainly takes place, and other parameters, such as the electron temperature. © 1995 American Institute of Physics.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.871481
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  • 4
    Digitale Medien
    Digitale Medien
    A single-shot spectrograph for the soft x-ray region (1994)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 65 (1994), S. 1631-1635 
    Details
    ISSN: 1089-7623
    Quelle: AIP Digital Archive
    Thema: Physik , Elektrotechnik, Elektronik, Nachrichtentechnik
    Notizen: A novel spectrograph comprised of a transmission grating, toroidal mirror, and microchannel plate detector is presented here. It is capable of detecting spectra in the wavelength range from 5 to 150 A(ring) with a resolution of about 1.5 A(ring). Owing it to high efficiency, even an x-ray spectrum of a low-energy laser produced plasma, i.e., emission of the order of 10−10 J/sr, can be measured in a single shot.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.1144851
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  • 5
    Digitale Medien
    Digitale Medien
    Soft x-ray spectra produced by subpicosecond laser-double-pulses (1991)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 59 (1991), S. 2672-2674 
    Details
    ISSN: 1077-3118
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: Soft x-ray spectra generated on flat Al targets by a 500 fs KrF* laser pulse (intensity 5.3×1015 W/cm2), preceded by a prepulse of the same pulse duration, have been measured as a function of the pulse separation and the prepulse intensity. It was found that not only the total x-ray emission was much stronger when the prepulse was present but, in particular, lines in the shorter wavelength region had a higher intensity than without prepulse, and were strongly dependent on the time separation between the prepulse and the main pulse.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.105902
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  • 6
    Digitale Medien
    Digitale Medien
    Influence of a thin adhesion layer on the damping of surface acoustic waves (1992)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 61 (1992), S. 156-158 
    Details
    ISSN: 1077-3118
    Quelle: AIP Digital Archive
    Thema: Physik
    Notizen: The attenuation of surface acoustic waves (SAWs) on YZ-LiNbO3 crystals, coated with an aluminum layer of several hundred angstroms, has been measured as a function of temperature in the range from 0.3 K to room temperature. A peak in attenuation was found between 50 and 250 K dependent on layer thickness and SAW frequency. Addition of an adhesion layer with a thickness of about 15 A(ring), placed between substrate material and metal coating, drastically lowers the attenuation at higher temperatures. In this case, the attenuation rises slowly with temperature and no peak occurs.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.108203
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  • 7
    Digitale Medien
    Digitale Medien
    Erratum: Soft x-ray spectra produced by subpicosecond laser double pulses [Appl. Phys. Lett. 59, 2672 (1991)] (1992)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 60 (1992), S. 1519-1519 
    Details
    ISSN: 1077-3118
    Quelle: AIP Digital Archive
    Thema: Physik
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1063/1.107424
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  • 8
    Digitale Medien
    Digitale Medien
    Amplified spontaneous emission in short-pulse excimer amplifiers (1990)
    Springer
    Applied physics 51 (1990), S. 71-74 
    Details
    ISSN: 1432-0649
    Schlagwort(e): 42.60 ; 42.55
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract We have found a simple analytical expression which describes the relation between amplified spontaneous emission (ASE) and small-signal gain in short-pulse amplifiers. It is also shown that the contrast of the short pulse to the ASE is weakly dependent on the saturation of the ASE, and influenced mainly by the saturation of the short pulse. The theoretical considerations were verified by measurements.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00332330
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  • 9
    Digitale Medien
    Digitale Medien
    Detailed study of the effect of a short prepulse on soft X-ray spectra generated by a high-intensity KrF* laser pulse (1992)
    Springer
    Applied physics 54 (1992), S. 493-499 
    Details
    ISSN: 1432-0649
    Schlagwort(e): 52.50.Jm ; 52.40.Nk ; 52.25.Nr
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract The effect of a short prepulse (0.5 ps) on soft X-ray spectra from a plasma generated by a high intensity KrF* laser pulse (main pulse: 0.5 ps, intensity I main=5.3×1015 W/cm2) on flat targets of Al and Cu has been studied in detail. The spectra have been measured as a function of the pulse separation Δt between the two pulses and the prepulse intensity I pre. It was found that both the overall emission and the line emission increased with Δt (at constant I pre) and with I pre (at constant Δt). In particular, lines in the shorter wavelength region had higher intensity. The influence of the prepulse on the line emission of specific transitions in the Al spectra was investigated systematicly. An explanation for the observed effects is given.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00325515
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  • 10
    Digitale Medien
    Digitale Medien
    Prospects of “water-window” X-ray emission from subpicosecond laser plasmas (2000)
    Springer
    Applied physics 70 (2000), S. 505-515 
    Details
    ISSN: 1432-0649
    Schlagwort(e): PACS: 52.25.Nr; 52.50.-b; 52.50.Dg; 52.50.Jm; 52.40.-w; 52.75.-d
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Physik
    Notizen: Abstract. Soft-X-radiation in the “water-window” region (23.3–43.6 Å) mainly from carbon laser plasmas generated by subpicosecond (700 fs) 0.248-μm laser pulses is studied as a function of angle of incidence and intensity (up to 1018 W/cm2) for p-polarized laser light. Furthermore, comparison is made between plasmas generated from massive and foil targets. Numerical calculations are performed using a hydrocode coupled to X-ray line and continuum emission calculations including radiation transport. The optimized conditions to achieve maximum water-window X-ray emissivity and, in particular, carbon Lyman-α line emission are investigated. In addition, analytical scalings are presented. These theoretical results are essentially confirmed by previous experiments. It is found that at optimized conditions, picosecond or subpicosecond laser plasma X-ray sources with a power of the order of 1–10 GW in a spectral window of 1 Å could be developed.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/s003400050853
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