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  • 1
    Electronic Resource
    Electronic Resource
    Light-gasdynamic-induced refractive index changes and beam propagation in fast-pumped high-power photodissociation lasers (1988)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Fluids 31 (1988), S. 1910-1921 
    Details
    ISSN: 1089-7666
    Source: AIP Digital Archive
    Topics: Physics
    Notes: In high-power photodissociation lasers such as the iodine laser, spatially inhomogeneous pump light deposition causes temperature and pressure gradients. These gradients set the gaseous laser medium into motion, thereby changing its density and thus also its refractive index. These perturbations may seriously degrade the laser beam quality. A pulse propagation model is presented, which for the first time incorporates the gasdynamic disturbances in an appropriate manner. Thus any deterioration of the beam quality resulting from gasdynamic effects and diffraction can be precisely evaluated. The model is shown to compare well with experiment. It is also suited for predicting the performance of high-power amplifier chains.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.866638
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Generation of MeV electrons and positrons with femtosecond pulses from a table-top laser system (2002)
    [S.l.] : American Institute of Physics (AIP)
    Physics of Plasmas 9 (2002), S. 987-999 
    Details
    ISSN: 1089-7674
    Source: AIP Digital Archive
    Topics: Physics
    Notes: In experiments, the feasibility was demonstrated of generating multi-MeV electrons in a form of a collimated beam utilizing a table-top laser system delivering 200 fs pulses with PL=1.2 TW and 10 Hz capability. The method uses the process of relativistic self-channeling in a high-density gas jet producing electron densities in the range of 3×1019–6×1020 cm−3. In a thorough investigation, angularly resolved and absolutely calibrated electron spectra were measured and their dependence on the plasma density, laser intensity, and gas medium was studied. For the optimum electron density of ne=2×1020 cm−3 the effective temperature of the electron energy distribution and the channel length exhibit a maximum of 5 MeV and 400 μm respectively. The laser-energyto-MeV-electron efficiency is estimated to be 5%. In a second step, utilizing the multi-MeV electron beam anti-particles, namely positrons, were successfully generated in a 2 mm Pb converter. The average intensity of this new source of positrons is estimated to be equivalent to a radioactivity of 2×108 Bq and it exhibits a very favorable scaling for higher laser intensities. © 2002 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1446879
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    A novel 45-channel electron spectrometer for high intensity laser-plasma interaction studies (2000)
    [S.l.] : American Institute of Physics (AIP)
    Review of Scientific Instruments 71 (2000), S. 1642-1645 
    Details
    ISSN: 1089-7623
    Source: AIP Digital Archive
    Topics: Physics , Electrical Engineering, Measurement and Control Technology
    Notes: We have developed a magnetic spectrometer to characterize the hot electrons generated in high-intensity (〉1018 W/cm2) laser-plasma interaction experiments. It comprises a dispersive element consisting of a permanent dipole magnet and an electron detector incorporating 45 scintillating/light-guiding plastic fibers connected to a cooled charged-coupled device camera. The main features of this instrument are high spectral resolution, low sensitivity to x and γ rays, and versatility due to its compact design. Performance and operational capabilities are illustrated based on experimental results in which electron energy–spectra in the range of 520 keV to 12.6 MeV were obtained with an energy resolution of 10% and a detection threshold of 106 electrons per MeV. © 2000 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1150511
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  • 4
    Electronic Resource
    Electronic Resource
    Generating positrons with femtosecond-laser pulses (2000)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 77 (2000), S. 2662-2664 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: Utilizing a femtosecond table-top laser system, we have succeeded in converting via electron acceleration in a plasma channel, low-energy photons into antiparticles, namely positrons. The average intensity of this source of positrons is estimated to be equivalent to 2×108 Bq and it exhibits a very favorable scaling for higher laser intensities. The advent of positron production utilizing femtosecond laser pulses may be the forerunner to a table-top positron source appropriate for applications in material science, and fundamental physics research like positronium spectroscopy. © 2000 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.1319526
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  • 5
    Electronic Resource
    Electronic Resource
    MeV γ-ray yield from solid targets irradiated with fs-laser pulses (1998)
    Woodbury, NY : American Institute of Physics (AIP)
    Applied Physics Letters 73 (1998), S. 3662-3664 
    Details
    ISSN: 1077-3118
    Source: AIP Digital Archive
    Topics: Physics
    Notes: We have investigated the MeV bremsstrahlung which is emitted when fast electrons generated by the interaction of 200 mJ, 130 fs Ti:sapphire laser pulses with a preformed plasma penetrate into a solid target. Employing different targets the dependence of the γ-ray spectrum on the atomic number was studied. We detected single γ photons with an energy up to 2.5 MeV and found a maximum conversion efficiency of the laser energy into MeV bremsstrahlung of 4×10−6. Data analysis using a Monte Carlo code revealed a fast-electron temperature of 0.9 MeV.© 1998 American Institute of Physics.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1063/1.122855
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  • 6
    Electronic Resource
    Electronic Resource
    An excimer laser pumped atomic iodine laser emitting pulses in the range of 2-12 ns
    Amsterdam : Elsevier
    Optics Communications 37 (1981), S. 123-126 
    Details
    ISSN: 0030-4018
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Physics
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0030-4018(81)90011-0
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    Paper (German National Licenses)
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  • 7
    Electronic Resource
    Electronic Resource
    Iodine laser oscillator in gain switch mode for ns pulses
    Amsterdam : Elsevier
    Optics Communications 13 (1975), S. 114-116 
    Details
    ISSN: 0030-4018
    Source: Elsevier Journal Backfiles on ScienceDirect 1907 - 2002
    Topics: Physics
    Type of Medium: Electronic Resource
    URL: http://linkinghub.elsevier.com/retrieve/pii/0030-4018(75)90022-X
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  • 8
    Electronic Resource
    Electronic Resource
    Theoretical analysis of a Brillouin switch for amplifier decoupling and prepulse suppression in short-pulse high-power laser systems (1988)
    Springer
    Applied physics 46 (1988), S. 333-338 
    Details
    ISSN: 1432-0649
    Keywords: 42.60Gd ; 42.65.Es
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract A switch suited for high-power amplifier chains emitting nanosecond pulses is theoretically investigated. It is based on a two-step Brillouin backscattering process. Gases like N2 or SF6 at high pressure are used as the scattering medium. The transmission efficiency is about 50%. The limitation is mainly due to gas breakdown. The capability for amplifier decoupling and prepulse suppression is excellent. Strong pulse steepening favors the generation of ultra-short laser pulses.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00686456
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  • 9
    Electronic Resource
    Electronic Resource
    Layout and performance of the Asterix IV iodine laser at MPQ, Garching (1995)
    Springer
    Applied physics 61 (1995), S. 325-332 
    Details
    ISSN: 1432-0649
    Keywords: 42.55.Lt ; 42.60Jf ; 52.80.Mg
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract In this paper, the design procedure and the performance of the single beam Asterix IV high-power iodine laser emitting at λ = 1315 nm is described. It has been developed on the basis of a 10-years experience with the 1 TW Asterix III laser-system and with the support of a 1-D and a 3-D pulse propagation code. Special emphasis has been put on achieving a high overall system efficiency and a beam intensity profile as homogeneous as possible. Presently, Asterix IV provides output pulses with durations from 0.2 to several ns. At a duration of 0.4 ns, the pulse power is 3 TW and at a duration of 5 ns the pulse energy reaches 2.1 kJ. Under these conditions, the laser can be fired every twenty minutes.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01081531
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  • 10
    Electronic Resource
    Electronic Resource
    Status of the Asterix IV iodine laser (1991)
    Springer
    Czechoslovak journal of physics 41 (1991), S. 272-276 
    Details
    ISSN: 1572-9486
    Source: Springer Online Journal Archives 1860-2000
    Topics: Physics
    Notes: Abstract After a description of the design and layout of the 2 kJ/5 TW single beam Asterix IV iodine laser the steps necessary for obtaining a laser beam intensity profile as homogeneous as possible are reported. These steps are: providing a homogeneous inversion density profile in the amplifiers by an appropriate flashlamp-reflector geometry and by compensating the edge enhancement caused by the image relaying system by suitable soft apertures. The paper concludes with a description of the results obtained by the laser system with the end-amplifier not in operation. The full system will become operational at the end of 1990.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01598766
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