Measurements of Ablation Pressure and Mass Ablation Rate Using a Target Pendulum and a Thin Foil Target at 10 µm Laser Wavelength

1983 ◽  
Vol 22 (Part 2, No. 4) ◽  
pp. L248-L250 ◽  
Author(s):  
Hiroyuki Daido ◽  
Ryuzi Tateyama ◽  
Kazuki Ogura ◽  
Kunioki Mima ◽  
Sadao Nakai ◽  
...  
Keyword(s):  
Thin Foil ◽  
Ablation Rate ◽  
Laser Wavelength ◽  
Foil Target ◽  
Ablation Pressure

scholarly journals Measurements and laser-wavelength dependence of mass-ablation rate and ablation pressure in planar layered targets

1991 ◽  
Vol 9 (3) ◽  
pp. 769-778 ◽  
Author(s):  
F. Dahmani ◽  
T. Kerdja
Keyword(s):  
Steady State ◽  
Energy Transport ◽  
Laser Light ◽  
Plasma Heating ◽  
Wavelength Dependence ◽  
Ablation Rate ◽  
Laser Wavelength ◽  
Ablation Pressure ◽  
Hydrodynamical Simulations ◽  
Laser Flux

Layered-targets experiments at 1.06-μm laser light have been performed in order to measure mass-ablation rate ṁ and ablation pressure Pa as a function of absorbed laser flux Ia and laser wavelength λL at irradiances of 1011-4.5 × 1012 W/cm2. The results can be put in the forms ṁ(g/cm2-s) ≈ 4.25 × 105[Ia(W/cm2)/1014]5/9(1 μm/λL)4/9 and Pa(Mbar) ≈ 20[Ia(W/cm2)/1014]7/9(1 μm/λL)2/9, which are consistent with the estimates obtained from a steady-state self-regulated model for plasma heating and with hydrodynamical simulations. Results show also a small lateral energy transport.

scholarly journals Laser ion acceleration in thin foil target

2014 ◽  
Author(s):  
Chengkun Huang ◽  
Brian J. Albright ◽  
Sasikumar Palaniyappan ◽  
Lin Yin
Keyword(s):  
Thin Foil ◽  
Ion Acceleration ◽  
Foil Target

scholarly journals Observation of Preformed Plasma Generated from a Thin-Foil Target for Laser-Driven Proton Acceleration

2014 ◽  
Vol 42 (2) ◽  
pp. 160
Author(s):  
Akito SAGISAKA ◽  
Alexander S. PIROZHKOV ◽  
Mamiko NISHIUCHI ◽  
Koichi OGURA ◽  
Hironao SAKAKI ◽  
...  
Keyword(s):  
Thin Foil ◽  
Proton Acceleration ◽  
Foil Target ◽  
Preformed Plasma

Laser-wavelength dependence of mass-ablation rate and heat-flux inhibition in laser-produced plasmas

1982 ◽  
Vol 26 (4) ◽  
pp. 2289-2292 ◽  
Author(s):  
R. Fabbro ◽  
E. Fabre ◽  
F. Amiranoff ◽  
C. Garban-Labaune ◽  
J. Virmont ◽  
...  
Keyword(s):  
Heat Flux ◽  
Wavelength Dependence ◽  
Ablation Rate ◽  
Laser Wavelength

scholarly journals Scanning electron microscope studies on laser ablation of solids

2019 ◽  
Vol 37 (01) ◽  
pp. 101-109 ◽  
Author(s):  
Mohamed E. Shaheen ◽  
Joel E. Gagnon ◽  
Brian J. Fryer
Keyword(s):  
Pulse Width ◽  
Laser Energy ◽  
Laser System ◽  
Picosecond Laser ◽  
Laser Pulses ◽  
Ablation Rate ◽  
Laser Wavelength ◽  
High Laser Fluence ◽  
Electron Imaging ◽  
Scanning Electron

AbstractThis study investigates the interaction of picosecond laser pulses with sapphire and brass in air using scanning electron microscopy. A picosecond laser system operating at a wavelength of 785 nm, pulse width of 110 ps, and variable repetition rate (1–1000 Hz) was used in this study. The pulse width applied in this work was not widely investigated as it lies in the gap between ultrashort (femtosecond) and long (nanosecond) pulse width lasers. Different surface morphologies were identified using secondary electron and backscattered electron imaging of the ablated material. Thermal ablation effects were more dominant in brass than in sapphire. Exfoliation and fractures of sapphire were observed at high laser fluence. Compared with brass, multiple laser pulses were necessary to initiate ablation in sapphire due to its poor absorption to the incident laser wavelength. Ablation rate of sapphire was lower than that of brass due to the dissipation of a portion of the laser energy due to heating and fracturing of the surface.

The variation of mass ablation rate with laser wavelength and target geometry

1982 ◽  
Vol 42 (1) ◽  
pp. 55-59 ◽  
Author(s):  
T.J. Goldsack ◽  
J.D. Kilkenny ◽  
B.J. MacGowan ◽  
S.A. Veats ◽  
P.F. Cunningham ◽  
...  
Keyword(s):  
Ablation Rate ◽  
Laser Wavelength

Projection imaging with directional electron and proton beams emitted from an ultrashort intense laser-driven thin foil target

2014 ◽  
Vol 57 (2) ◽  
pp. 025001 ◽  
Author(s):  
M Nishiuchi ◽  
I W Choi ◽  
H Daido ◽  
T Nakamura ◽  
A S Pirozhkov ◽  
...  
Keyword(s):  
Thin Foil ◽  
Intense Laser ◽  
Proton Beams ◽  
Foil Target

scholarly journals Laser triggered micro-lens for focusing and energy selection of MeV protons

2007 ◽  
Vol 25 (1) ◽  
pp. 71-77 ◽  
Author(s):  
O. WILLI ◽  
T. TONCIAN ◽  
M. BORGHESI ◽  
J. FUCHS ◽  
E. D'HUMIÈRES ◽  
...  
Keyword(s):  
Thin Foil ◽  
Radial Electric Field ◽  
Laser Pulses ◽  
Outer Wall ◽  
Relativistic Electrons ◽  
Hot Plasma ◽  
Foil Target ◽  
Mev Protons ◽  
Micro Lens ◽  
Selection Of

We present a novel technique for focusing and energy selection of high-current, MeV proton/ion beams. This method employs a hollow micro-cylinder that is irradiated at the outer wall by a high intensity, ultra-short laser pulse. The relativistic electrons produced are injected through the cylinder's wall, spread evenly on the inner wall surface of the cylinder, and initiate a hot plasma expansion. A transient radial electric field (107–1010 V/m) is associated with the expansion. The transient electrostatic field induces the focusing and the selection of a narrow band component out of the broadband poly-energetic energy spectrum of the protons generated from a separate laser irradiated thin foil target that are directed axially through the cylinder. The energy selection is tunable by changing the timing of the two laser pulses. Computer simulations carried out for similar parameters as used in the experiments explain the working of the micro-lens.

Towards Sub-TeV electron beams driven by ultra-short, ultra-intense laser pulses

2012 ◽  
Vol 78 (4) ◽  
pp. 461-468 ◽  
Author(s):  
WEI-MIN WANG ◽  
ZHENG-MING SHENG ◽  
SHIGEO KAWATA ◽  
CHUN-YANG ZHENG ◽  
YU-TONG LI ◽  
...  
Keyword(s):  
Laser Intensity ◽  
Electron Beams ◽  
Energetic Electron ◽  
Thin Foil ◽  
Laser Pulses ◽  
Intense Laser ◽  
Particle In Cell ◽  
Intense Laser Pulses ◽  
Laser Focus ◽  
Foil Target

AbstractEnergetic electron beam generation from a thin foil target by the ponderomotive force of an ultra-intense circularly polarized laser pulse is investigated. Two-dimensional particle-in-cell (PIC) simulations show that laser pulses with intensity of 1022–1023 Wcm−2 generate about 1–10 GeV electron beams, in agreement with the prediction of one-dimensional theory. When the laser intensity is at 1024–1025 Wcm−2, the beam energy obtained from PIC simulations is lower than the values predicted by the theory. The radiation damping effect is considered, which is found to become important for the laser intensity higher than 1025 Wcm−2. The effect of laser focus positions is also discussed.

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