scholarly journals Laser-produced dense plasma in extremely high pressure gas and its application to a plasma-bridged gap switch

1989 ◽  
Vol 7 (3) ◽  
pp. 531-537 ◽  
Author(s):  
J. Yamada ◽  
T. Okuda
Keyword(s):  
High Pressure ◽  
Applied Voltage ◽  
High Velocity ◽  
Focal Spot ◽  
Laser Light ◽  
Switching Time ◽  
Dense Plasma ◽  
Intense Laser ◽  
Switching Characteristics ◽  
Focusing Lens

When an extremely high pressure gas is irradiated by an intense laser light, a dense plasma produced at the focal spot moves towards the focusing lens with a high velocity. Making use of this phenomenon, a new plasma-bridged gap switch is proposed and its switching characteristics is experimentally examined. From the experiments, it is confirmed that the switching time is almost constant with the applied voltage only when the focal spot is just on the positive electrode, indicating that the bridging of gap is caused by the laser light.

scholarly journals Reflection of intense laser light from microstructured targets as a potential diagnostic of laser focus and plasma temperature

2018 ◽  
Vol 7 ◽  
Author(s):  
J. Jarrett ◽  
M. King ◽  
R. J. Gray ◽  
N. Neumann ◽  
L. Döhl ◽  
...  
Keyword(s):  
Focal Spot ◽  
Laser Light ◽  
Plasma Temperature ◽  
Regular Structure ◽  
Intense Laser ◽  
Reflected Light ◽  
Laser Focus ◽  
Speckle Patterns ◽  
Focal Spot Diameter ◽  
Laser Focal Spot

The spatial-intensity profile of light reflected during the interaction of an intense laser pulse with a microstructured target is investigated experimentally and the potential to apply this as a diagnostic of the interaction physics is explored numerically. Diffraction and speckle patterns are measured in the specularly reflected light in the cases of targets with regular groove and needle-like structures, respectively, highlighting the potential to use this as a diagnostic of the evolving plasma surface. It is shown, via ray-tracing and numerical modelling, that for a laser focal spot diameter smaller than the periodicity of the target structure, the reflected light patterns can potentially be used to diagnose the degree of plasma expansion, and by extension the local plasma temperature, at the focus of the intense laser light. The reflected patterns could also be used to diagnose the size of the laser focal spot during a high-intensity interaction when using a regular structure with known spacing.

Liquid-phase laser ablation

2010 ◽  
Vol 82 (6) ◽  
pp. 1317-1327 ◽  
Author(s):  
Koichi Sasaki ◽  
Noriharu Takada
Keyword(s):  
High Pressure ◽  
Laser Ablation ◽  
Liquid Phase ◽  
Cavitation Bubble ◽  
Dense Plasma ◽  
Intense Laser ◽  
Solid Target ◽  
Formation Processes ◽  
Intense Laser Pulse ◽  
High Pressure And Temperature

The irradiation of an intense laser pulse onto a solid target immersed in liquid produces dense plasma. The plasma produced by liquid-phase laser ablation has unique features at high pressure and temperature, which are never realized by liquid-phase discharges. Another unique characteristic of liquid-phase laser ablation is the formation of a cavitation bubble. This article reports the fundamental aspects of liquid-phase laser-ablation plasmas, cavitation bubbles, and the formation processes of nanoparticles, together with some applications of liquid-phase laser ablation.

scholarly journals Bremsstrahlung emission profile from intense laser-solid interactions as a function of laser focal spot size

2019 ◽  
Vol 61 (3) ◽  
pp. 034001 ◽  
Author(s):  
C D Armstrong ◽  
C M Brenner ◽  
E Zemaityte ◽  
G G Scott ◽  
D R Rusby ◽  
...  
Keyword(s):  
Focal Spot ◽  
Spot Size ◽  
Intense Laser ◽  
Focal Spot Size ◽  
Emission Profile ◽  
Bremsstrahlung Emission ◽  
Laser Focal Spot ◽  
Laser Solid Interactions

Bremsstrahlung and nonlinear currents in a dense plasma exposed to an intense laser field

1994 ◽  
Vol 49 (2) ◽  
pp. 1563-1568 ◽  
Author(s):  
A. Ya. Polishchuk ◽  
J. Meyer-ter-Vehn
Keyword(s):  
Laser Field ◽  
Dense Plasma ◽  
Intense Laser ◽  
Intense Laser Field

scholarly journals Numerical simulation of a plasmonic lens for laser light focusing

2021 ◽  
Vol 2103 (1) ◽  
pp. 012174
Author(s):  
E S Kozlova ◽  
V V Kotlyar
Keyword(s):  
Focal Spot ◽  
Laser Light ◽  
Incident Light ◽  
Lens Design ◽  
Light Wavelength ◽  
Optimal Parameters ◽  
Plasmonic Lens ◽  
Radial Polarization ◽  
Incident Light Wavelength ◽  
Difference Time

Abstract In this paper, the design of a plasmonic lens in gold and silver thin films for focusing the light with radial polarization is presented. Using the finite difference time domain method the optimal parameters of the plasmonic lens design are found. It was shown that the silver plasmonic lens produces a tight focal spot with a full width at half maximum of 0.38 of the incident light wavelength.

The pump-probe approach to coherent backscattering of intense laser light from cold atoms

2009 ◽  
Author(s):  
Tobias Geiger ◽  
Thomas Wellens ◽  
Vyacheslav Shatokhin ◽  
Andreas Buchleitner ◽  
Dmitry N. Chigrin
Keyword(s):  
Cold Atoms ◽  
Laser Light ◽  
Intense Laser ◽  
Pump Probe ◽  
Coherent Backscattering ◽  
Probe Approach
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