scholarly journals Parametric Study of Proton Acceleration from Laser-Thin Foil Interaction

Plasma ◽  
2021 ◽  
Vol 4 (4) ◽  
pp. 670-680
Author(s):  
Mohammed Almassarani ◽  
Sixu Meng ◽  
Burgard Beleites ◽  
Falk Ronneberger ◽  
Gerhard G. Paulus ◽  
...  
Keyword(s):  
Laser Energy ◽  
Thin Foil ◽  
Spot Size ◽  
Maximum Energy ◽  
Single Shot ◽  
Proton Acceleration ◽  
Detection Range ◽  
Charge Coupled Device ◽  
Experimental Findings ◽  
Beam Characteristics

We experimentally investigated the accelerated proton beam characteristics such as maximum energy and number by varying the incident laser parameters. For this purpose, we varied the laser energy, focal spot size, polarization, and pulse duration. The proton spectra were recorded using a single-shot Thomson parabola spectrometer equipped with a microchannel plate and a high-resolution charge-coupled device with a wide detection range from a few tens of keV to several MeV. The outcome of the experimental findings is discussed in detail and compared to other theoretical works.

scholarly journals Proton beam quality enhancement by spectral phase control of a PW-class laser system

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
T. Ziegler ◽  
D. Albach ◽  
C. Bernert ◽  
S. Bock ◽  
F.-E. Brack ◽  
...  
Keyword(s):  
Proton Beam ◽  
Laser Energy ◽  
Beam Quality ◽  
Laser System ◽  
Thin Foil ◽  
High Repetition Rate ◽  
Spectral Phase ◽  
Experimental Investigations ◽  
Enhancement Effect ◽  
Proton Acceleration

AbstractWe report on experimental investigations of proton acceleration from solid foils irradiated with PW-class laser-pulses, where highest proton cut-off energies were achieved for temporal pulse parameters that varied significantly from those of an ideally Fourier transform limited (FTL) pulse. Controlled spectral phase modulation of the driver laser by means of an acousto-optic programmable dispersive filter enabled us to manipulate the temporal shape of the last picoseconds around the main pulse and to study the effect on proton acceleration from thin foil targets. The results show that applying positive third order dispersion values to short pulses is favourable for proton acceleration and can lead to maximum energies of 70 MeV in target normal direction at 18 J laser energy for thin plastic foils, significantly enhancing the maximum energy compared to ideally compressed FTL pulses. The paper further proves the robustness and applicability of this enhancement effect for the use of different target materials and thicknesses as well as laser energy and temporal intensity contrast settings. We demonstrate that application relevant proton beam quality was reliably achieved over many months of operation with appropriate control of spectral phase and temporal contrast conditions using a state-of-the-art high-repetition rate PW laser system.

scholarly journals Dependence of laser accelerated protons on laser energy following the interaction of defocused, intense laser pulses with ultra-thin targets

2011 ◽  
Vol 29 (3) ◽  
pp. 345-351 ◽  
Author(s):  
C.M. Brenner ◽  
J.S. Green ◽  
A.P.L. Robinson ◽  
D.C. Carroll ◽  
B. Dromey ◽  
...  
Keyword(s):  
Laser Pulse ◽  
Focal Spot ◽  
Laser Pulse Energy ◽  
Laser Energy ◽  
Spot Size ◽  
Proton Flux ◽  
Focal Spot Size ◽  
Order Of Magnitude ◽  
Laser Focal Spot ◽  
Accelerated Protons

AbstractThe scaling of the flux and maximum energy of laser-driven sheath-accelerated protons has been investigated as a function of laser pulse energy in the range of 15–380 mJ at intensities of 1016–1018 W/cm2. The pulse duration and target thickness were fixed at 40 fs and 25 nm, respectively, while the laser focal spot size and drive energy were varied. Our results indicate that while the maximum proton energy is dependent on the laser energy and laser spot diameter, the proton flux is primarily related to the laser pulse energy under the conditions studied here. Our measurements show that increasing the laser energy by an order of magnitude results in a more than 500-fold increase in the observed proton flux. Whereas, an order of magnitude increase in the laser intensity generated by decreasing the laser focal spot size, at constant laser energy, gives rise to less than a tenfold increase in observed proton flux.

Optimization of laser energy deposition for single-shot high aspect-ratio microstructuring of thick BK7 glass

2016 ◽  
Vol 120 (1) ◽  
pp. 013102 ◽  
Author(s):  
Valerio Garzillo ◽  
Vytautas Jukna ◽  
Arnaud Couairon ◽  
Robertas Grigutis ◽  
Paolo Di Trapani ◽  
...  
Keyword(s):  
Aspect Ratio ◽  
High Aspect Ratio ◽  
Energy Deposition ◽  
Laser Energy ◽  
Single Shot ◽  
Bk7 Glass

Energy Transfer and Molecule-Radiation Interaction in Optical Microcavities

2006 ◽  
Author(s):  
Haiyong Quan ◽  
Zhixiong (James) Guo
Keyword(s):  
Energy Transfer ◽  
Molecular Detection ◽  
Laser Energy ◽  
Maximum Energy ◽  
Whispering Gallery Modes ◽  
Optical Microcavities ◽  
Optical Wavelength ◽  
Whispering Gallery ◽  
Microcavity Devices ◽  
And Storage

Laser energy transfer and molecule-radiation interaction in optical microcavity devices are characterized. The device is operated at whispering-gallery modes, and consists of a microcavity and a micro-waveguide coupled by a sub-micrometer air-gap. Emphases are placed on the influences of microcavity size and waveguide compatibility on the energy transfer and storage capability, on the interactions of foreign molecules with the evanescent radiation field surrounding a resonant microcavity. An optimal gap is found for the considered device configuration where maximum energy storage is achieved. This optimal gap is dependent on the resonance mode as well as the morphology. The Q factor increases exponentially with increasing gap and saturates as the gap approaches the optical wavelength. The influence of molecules attachment is demonstrated and the potential in molecular detection is discussed.

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

Ablation efficiency of gold at fs/ps laser treatment in water and air

2022 ◽  
Vol 19 (2) ◽  
pp. 026001
Author(s):  
N A Smirnov ◽  
S I Kudryashov ◽  
А А Rudenko ◽  
A A Nastulyavichus ◽  
A A Ionin
Keyword(s):  
Single Pulse ◽  
Scanning Force Microscopy ◽  
Sample Surface ◽  
Spot Size ◽  
Single Shot ◽  
Gold Target ◽  
Ablation Efficiency ◽  
Significant Difference ◽  
Scanning Force ◽  
Crater Morphology

Abstract A comparison of single-pulse laser ablation of gold target by pulses with a 0.3–10 ps duration and a wavelength of 515 nm in air and in water was performed. The radiation was focused on the sample surface through the objectives with numerical apertures NA = 0.65 and 0.25. The influence of the medium, pulse duration, and spot size on the crater morphology was studied. A significant difference in crater morphology was found for different lenses. The ablation efficiency was studied by measuring the profiles of single-shot pulse craters using scanning force microscopy. The contribution of filamentation to the ablation process is shown quantitatively.

Calibration and Monte Carlo simulation of a single-photon counting charge-coupled device for single-shot X-ray spectrum measurements

2013 ◽  
Vol 11 (11) ◽  
pp. 110401-110404 ◽  
Author(s):  
Yonghong Yan Yonghong Yan ◽  
Lai Wei Lai Wei ◽  
Xianlun Wen Xianlun Wen ◽  
Yuchi Wu Yuchi Wu ◽  
Zongqing Zhao Zongqing Zhao ◽  
...  
Keyword(s):  
Monte Carlo Simulation ◽  
Monte Carlo ◽  
Single Photon ◽  
Photon Counting ◽  
Single Shot ◽  
Charge Coupled Device ◽  
Single Photon Counting ◽  
X Ray ◽  
Spectrum Measurements

scholarly journals Effects of front surface plasma expansion on proton acceleration in ultraintense laser irradiation of foil targets

2008 ◽  
Vol 26 (4) ◽  
pp. 591-596 ◽  
Author(s):  
P. McKenna ◽  
D.C. Carroll ◽  
O. Lundh ◽  
F. Nürnberg ◽  
K. Markey ◽  
...  
Keyword(s):  
Laser Pulse ◽  
Laser Irradiation ◽  
Proton Energy ◽  
Front Surface ◽  
Picosecond Laser ◽  
Thin Foil ◽  
Energy Conversion Efficiency ◽  
High Energy ◽  
Maximum Energy ◽  
Incident Laser Pulse

AbstractThe properties of beams of high energy protons accelerated during ultraintense, picosecond laser-irradiation of thin foil targets are investigated as a function of preplasma expansion at the target front surface. Significant enhancement in the maximum proton energy and laser-to-proton energy conversion efficiency is observed at optimum preplasma density gradients, due to self-focusing of the incident laser pulse. For very long preplasma expansion, the propagating laser pulse is observed to filament, resulting in highly uniform proton beams, but with reduced flux and maximum energy.

Excimer Lasbr Induced Crystallization of thin Amorphous Si Films on SiO2: Implications of Crystallized Microstructures for Phase Transformation Mechanisms

1992 ◽  
Vol 283 ◽  
Author(s):  
H. J. Kim ◽  
James S. Im ◽  
Michael O. Thompson
Keyword(s):  
Grain Size ◽  
Energy Density ◽  
Laser Energy ◽  
High Energy ◽  
High Energy Density ◽  
Laser Energy Density ◽  
Single Shot ◽  
Average Grain Size ◽  
Si Films ◽  
Density Regime

ABSTRACTUsing planar view transmission electron microscope (TEM) and transient reflectance (TR) analyses, we have investigated the excimer laser crystallization of amorphous silicon (a-Si) films on SiO2. Emphasis was placed on characterizing the microstructures of the single-shot irradiated materials, as a function of the energy density of the laser pulse and the temperature of the substrate. The dependence of the grain size and melt duration as a function of energy density revealed two major crystallization regimes. In the low energy density regime, the average grain size first increases gradually with increases in the laser energy density. In the high energy density regime, on the other hand, a very fine grained microstructure, which is relatively insensitive to variations in the laser energy density, is obtained. In addition, we have discovered that at the transition between these two regimes an extremely small experimental window exists, within which an exceedingly large grain-sized polycrystalline film is obtained. We suggest a liquid phase growth model for this phenomenon, which is based on the regrowth of crystals from the residual solid islands at the oxide interface.

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