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Hartmut Ruhl - One of the best experts on this subject based on the ideXlab platform.

  • Laser field absorption in self-generated electron-positron pair plasma.
    Physical Review Letters, 2011
    Co-Authors: E. N. Nerush, I. Yu. Kostyukov, Alexander Fedotov, N. B. Narozhny, N. V. Elkina, Hartmut Ruhl
    Abstract:

    Recently, much attention has been attracted to the problem of limitations on the attainable intensity of High Power Lasers [A. M. Fedotov et al., Phys. Rev. Lett. 105, 080402 (2010)]. The laser energy can be absorbed by electron-positron pair plasma produced from a seed by a strong laser field via the development of the electromagnetic cascades. The numerical model for a self-consistent study of electron-positron pair plasma dynamics is developed. Strong absorption of the laser energy in self-generated overdense electron-positron pair plasma is demonstrated. It is shown that the absorption becomes important for a not extremely High laser intensity I{approx}10{sup 24} W/cm{sup 2} achievable in the near future.

  • laser field absorption in self generated electron positron pair plasma
    Physical Review Letters, 2011
    Co-Authors: E. N. Nerush, N. B. Narozhny, N. V. Elkina, A M Fedotov, Yu I Kostyukov, Hartmut Ruhl
    Abstract:

    Recently, much attention has been attracted to the problem of limitations on the attainable intensity of High Power Lasers [A. M. Fedotov et al., Phys. Rev. Lett. 105, 080402 (2010)]. The laser energy can be absorbed by electron-positron pair plasma produced from a seed by a strong laser field via the development of the electromagnetic cascades. The numerical model for a self-consistent study of electron-positron pair plasma dynamics is developed. Strong absorption of the laser energy in self-generated overdense electron-positron pair plasma is demonstrated. It is shown that the absorption becomes important for a not extremely High laser intensity $I\ensuremath{\sim}{10}^{24}\text{ }\text{ }\mathrm{W}/{\mathrm{cm}}^{2}$ achievable in the near future.

E. N. Nerush - One of the best experts on this subject based on the ideXlab platform.

  • Laser field absorption in self-generated electron-positron pair plasma.
    Physical Review Letters, 2011
    Co-Authors: E. N. Nerush, I. Yu. Kostyukov, Alexander Fedotov, N. B. Narozhny, N. V. Elkina, Hartmut Ruhl
    Abstract:

    Recently, much attention has been attracted to the problem of limitations on the attainable intensity of High Power Lasers [A. M. Fedotov et al., Phys. Rev. Lett. 105, 080402 (2010)]. The laser energy can be absorbed by electron-positron pair plasma produced from a seed by a strong laser field via the development of the electromagnetic cascades. The numerical model for a self-consistent study of electron-positron pair plasma dynamics is developed. Strong absorption of the laser energy in self-generated overdense electron-positron pair plasma is demonstrated. It is shown that the absorption becomes important for a not extremely High laser intensity I{approx}10{sup 24} W/cm{sup 2} achievable in the near future.

  • laser field absorption in self generated electron positron pair plasma
    Physical Review Letters, 2011
    Co-Authors: E. N. Nerush, N. B. Narozhny, N. V. Elkina, A M Fedotov, Yu I Kostyukov, Hartmut Ruhl
    Abstract:

    Recently, much attention has been attracted to the problem of limitations on the attainable intensity of High Power Lasers [A. M. Fedotov et al., Phys. Rev. Lett. 105, 080402 (2010)]. The laser energy can be absorbed by electron-positron pair plasma produced from a seed by a strong laser field via the development of the electromagnetic cascades. The numerical model for a self-consistent study of electron-positron pair plasma dynamics is developed. Strong absorption of the laser energy in self-generated overdense electron-positron pair plasma is demonstrated. It is shown that the absorption becomes important for a not extremely High laser intensity $I\ensuremath{\sim}{10}^{24}\text{ }\text{ }\mathrm{W}/{\mathrm{cm}}^{2}$ achievable in the near future.

N. B. Narozhny - One of the best experts on this subject based on the ideXlab platform.

  • Laser field absorption in self-generated electron-positron pair plasma.
    Physical Review Letters, 2011
    Co-Authors: E. N. Nerush, I. Yu. Kostyukov, Alexander Fedotov, N. B. Narozhny, N. V. Elkina, Hartmut Ruhl
    Abstract:

    Recently, much attention has been attracted to the problem of limitations on the attainable intensity of High Power Lasers [A. M. Fedotov et al., Phys. Rev. Lett. 105, 080402 (2010)]. The laser energy can be absorbed by electron-positron pair plasma produced from a seed by a strong laser field via the development of the electromagnetic cascades. The numerical model for a self-consistent study of electron-positron pair plasma dynamics is developed. Strong absorption of the laser energy in self-generated overdense electron-positron pair plasma is demonstrated. It is shown that the absorption becomes important for a not extremely High laser intensity I{approx}10{sup 24} W/cm{sup 2} achievable in the near future.

  • laser field absorption in self generated electron positron pair plasma
    Physical Review Letters, 2011
    Co-Authors: E. N. Nerush, N. B. Narozhny, N. V. Elkina, A M Fedotov, Yu I Kostyukov, Hartmut Ruhl
    Abstract:

    Recently, much attention has been attracted to the problem of limitations on the attainable intensity of High Power Lasers [A. M. Fedotov et al., Phys. Rev. Lett. 105, 080402 (2010)]. The laser energy can be absorbed by electron-positron pair plasma produced from a seed by a strong laser field via the development of the electromagnetic cascades. The numerical model for a self-consistent study of electron-positron pair plasma dynamics is developed. Strong absorption of the laser energy in self-generated overdense electron-positron pair plasma is demonstrated. It is shown that the absorption becomes important for a not extremely High laser intensity $I\ensuremath{\sim}{10}^{24}\text{ }\text{ }\mathrm{W}/{\mathrm{cm}}^{2}$ achievable in the near future.

  • limitations on the attainable intensity of High Power Lasers
    Physical Review Letters, 2010
    Co-Authors: A M Fedotov, N. B. Narozhny, G Mourou, G Korn
    Abstract:

    It is shown that even a single e-e+ pair created by a superstrong laser field in vacuum would cause development of an avalanchelike QED cascade which rapidly depletes the incoming laser pulse. This confirms Bohr's old conjecture that the electric field of the critical QED strength ES=m2c3/e could never be created. © 2010 The American Physical Society.

Peter Wessels - One of the best experts on this subject based on the ideXlab platform.

  • single frequency fiber amplifier at 1 5 µm with 100 w in the linearly polarized tem 00 mode for next generation gravitational wave detectors
    Optics Express, 2017
    Co-Authors: Omar De Varona, Willy Fittkau, Phillip Booker, Thomas Theeg, Michael Steinke, Dietmar Kracht, Jorg Neumann, Peter Wessels
    Abstract:

    Next-generation gravitational wave detectors require single-frequency and High Power Lasers at a wavelength of 1.5 µm addressing a set of demanding requirements such as linearly-polarized TEM00 radiation with low noise to run for long periods. In this context, fiber amplifiers in MOPA configuration are promising candidates to fulfill these requirements. We present a single-frequency monolithic Er:Yb co-doped fiber amplifier (EYDFA) at 1.5 µm with a linearly-polarized TEM00 output Power of 100 W. The EYDFA is pumped off-resonant at 940 nm to enhance the Yb-to-Er energy transfer efficiency and enable Higher ASE threshold. We also performed numerical simulations to investigate the off-resonant pumping scheme and confirm the corresponding experimental results.

  • single frequency fiber amplifier at 15 µm with 100 w in the linearly polarized tem_00 mode for next generation gravitational wave detectors
    Optics Express, 2017
    Co-Authors: Omar De Varona, Willy Fittkau, Phillip Booker, Thomas Theeg, Michael Steinke, Dietmar Kracht, Jorg Neumann, Peter Wessels
    Abstract:

    Next-generation gravitational wave detectors require single-frequency and High Power Lasers at a wavelength of 1.5 µm addressing a set of demanding requirements such as linearly-polarized TEM00 radiation with low noise to run for long periods. In this context, fiber amplifiers in MOPA configuration are promising candidates to fulfill these requirements. We present a single-frequency monolithic Er:Yb co-doped fiber amplifier (EYDFA) at 1.5 µm with a linearly-polarized TEM00 output Power of 100 W. The EYDFA is pumped off-resonant at 940 nm to enhance the Yb-to-Er energy transfer efficiency and enable Higher ASE threshold. We also performed numerical simulations to investigate the off-resonant pumping scheme and confirm the corresponding experimental results.

Ricardo Gariba-silva - One of the best experts on this subject based on the ideXlab platform.

  • In vitro bond strength of an epoxy resin-based root canal sealer to root dentin irradiated with High-Power Lasers and adhesive interface analyses
    Lasers in Medical Science, 2018
    Co-Authors: Vanessa Lessa C. Araujo, Pedro Basto Cruvinel, Regina Guenka Palma-dibb, Ricardo Gariba-silva
    Abstract:

    The aim of this study was to evaluate in vitro the influence of High-Power Lasers (Nd:YAG and diode 980 nm) associated with mineral coal as fotopotencializer on bond strength of an epoxy resin-based root canal sealer to root dentin, using the pushout test, and on the dentin/filling material interface, using confocal laser microscopy. For this purposes, 50 canines were instrumented with Mtwo rotary system up to #50.04 instrument and randomly assigned to five groups ( n  = 10): group I—control EDTAC; group II—EDTAC and Nd:YAG laser; group III—EDTAC and diode laser 980 nm; group IV—EDTAC, Nd:YAG laser and mineral coal 5 g/100 mL; and group V—EDTAC, diode laser 980 nm and mineral coal 5 g/100 mL. All data were analyzed by ANOVA (at 5% significance level) following the Kruskal-Wallis, Dunn and Tukey tests. The group I increased more bond strength of the sealer to root dentin that treated with only EDTAC 17% (17.21 ± 21.75 MPa), similar to the group II (12.21 ± 18.20 MPa) and group IV (14.92 ± 28.06 MPa), both treated with Nd:YAG laser, with the exception of group IV, which was added to mineral coal. The group V (8.75 ± 13.42 MPa) had similar results to the groups II and IV, but the same similarity were found when compared with group III (7.11 + 11.28 MPa), with lower results. Regarding the root thirds, the apical third (23.27 ± 29.21 MPa) presented a statistically Higher value on bond strength than the cervical third (5.92 ± 5.33 MPa) and middle third (6.93 ± 7, 11 MPa) ( p  > 0.05). Group II (86.27 μm) showed the Highest tags penetration values, with a statistically difference to the group III (51.57 μm), IV (36.77 μm) and V (32.37 μm) ( p   0.05). Group IV had the lowest values and was statistically similarity to groups III and V (p > 0.05). It was concluded that the treatment with Nd:YAG laser provides better results than the diode 980 nm laser, except when was added mineral coal. The control and diode 980 nm laser groups presented less adhesive failures and more mists failures than the other groups. Both Lasers did not interfere negatively compared to the control group.