scholarly journals Vacancy of laser field induced by phase reflection in underdense plasmas and its relation to laser-plasma parameters

2006 ◽  
Vol 55 (5) ◽  
pp. 2347
Author(s):  
Zhang Qiu-Ju ◽  
Sheng Zheng-Ming ◽  
Wang Xing-Hai ◽  
Man Bao-Yuan ◽  
Cang Yu ◽  
...  
Keyword(s):  
Laser Plasma ◽  
Laser Field ◽  
Plasma Parameters ◽  
Underdense Plasmas ◽  
Phase Reflection

scholarly journals Laser generated plasmas as a source for real time studies in X-ray crystal research: Part II: In search of an optimum choice of laser plasma coupling conditions

1984 ◽  
Vol 2 (2) ◽  
pp. 187-199 ◽  
Author(s):  
K. Schäfer ◽  
W. D. Zimmer
Keyword(s):  
Real Time ◽  
Laser Plasma ◽  
Electron Spectrum ◽  
Line Emission ◽  
Simplified Model ◽  
Hot Electron ◽  
Plasma Parameters ◽  
X Ray ◽  
Laser Plasmas ◽  
Plasma Coupling

For real-time diffraction experiments in X-ray crystal research a simplified model is chosen to describe laser-generated plasmas. This enables a rough estimate of the optimum laser plasma parameters necessary to maximize the line emission of highly ionized species. Furthermore, the use of the hot electron spectrum of laser plasmas to generate ultrashort Kα-emission is discussed.

scholarly journals Pulsation of laser–plasma interaction explained by density ripple buildup and relaxation for understanding smoothing by random-phase plate, ISI, and broadband

1991 ◽  
Vol 9 (2) ◽  
pp. 381-395 ◽  
Author(s):  
Gu Min ◽  
H. Hora
Keyword(s):  
Laser Plasma ◽  
Laser Field ◽  
Bragg Reflection ◽  
Random Phase ◽  
Turnaround Time ◽  
Phase Plate ◽  
Direct Drive ◽  
Plasma Interaction ◽  
Laser Plasma Interaction ◽  
Plasma Corona

In recent years experimental results about the pulsation of reflectivity or 3ω/2 harmonics from laser-irradiated plasma with a period of 10–20 ps initiated a reconsideration of a broad field of phenomena of laser-plasma interaction. We present here numerical results from a very general hydrodynamic computation showing that the pulsation is due to a standing-wave-produced density ripple in the widespread plasma corona causing these after 2 ps at Laue-Bragg reflection at very low density, followed by a hydrodynamic relaxation of the ripple. This cycle has a turnaround time of about 6–10 ps and immediately explains the observation of pulsation. The suppression of pulsation and the achievement of smooth direct drive is then understood by a washing-out process of the ripples when using the random-phase plate (RPP) or broadband irradiation, or by just preventing the buildup of the ripple at the induced spatial incoherence (ISI), where coherence of the laser field is 1 or 2 ps only.

scholarly journals AN EXPERIMENTAL STUDY OF THE RELATIONSHIP BETWEEN SLABE, HALF-CYLINDER AND FOIL TARGET STRUCTURE AND ITS LASER PLASMA PARAMETERS DISTRIBUTION

1993 ◽  
Vol 42 (5) ◽  
pp. 785
Author(s):  
HAN SHEN-SHENG ◽  
XU ZHI-ZHAN ◽  
JIANG ZHI-MING ◽  
LI YUE-LIN ◽  
WANG XIAO-FANG ◽  
...  
Keyword(s):  
Experimental Study ◽  
Laser Plasma ◽  
Target Structure ◽  
Plasma Parameters ◽  
Foil Target ◽  
The Relationship

Characterization of the palladium plasma produced by nanosecond pulsed 532 nm and 1064 nm wavelength lasers

Laser Physics ◽  
2021 ◽  
Vol 32 (2) ◽  
pp. 026002
Author(s):  
M Asif ◽  
U Amin ◽  
Z U Rehman ◽  
R Ali ◽  
H Qayyum
Keyword(s):  
Kinetic Energy ◽  
Electron Temperature ◽  
Electron Density ◽  
Laser Plasma ◽  
Laser Fluence ◽  
Plasma Heating ◽  
Total Charge ◽  
Plasma Parameters ◽  
Wide Range ◽  
532 Nm

Abstract Palladium plasma produced by nanosecond pulsed 532 nm and 1064 nm wavelengths lasers is studied with the help of planer Langmuir probe. The experiment is conducted over a wide range of the laser fluence (1.6–40 J cm−2). The measured time of flight ions distributions are used to infer total charge, kinetic energy of the palladium ions and plasma parameters. Our results indicate that the ion charge produced by both laser wavelengths is an increasing function of the laser fluence. Initially, the ion charge produced by 1064 nm is lower than 532 nm, but it increases at much faster rate with the rise of laser fluence as the inverse bremsstrahlung plasma heating prevails at higher plasma densities. The most probable kinetic energy of the Pd ions produced by 1064 nm wavelength is also lower than that of 532 nm. The time varying plasma electron temperature and electron density are derived from the current–voltage plots of the two plasmas. For both wavelengths, the electron temperature and electron density rapidly climb to a maximum value and then gradually decline with time. However, in case of the 532 nm, the electron temperature and electron density remain consistently high throughout the laser plasma. The results are compared the available literature and discussed by considering surface reflectivity, ablation rate of the Pd target and laser plasma heating. The results presented in this work will provide more insight into the process of laser ablation and can be useful for the development of laser-plasma ion sources.

Control of femtosecond laser plasma parameters by surface contaminants cleaning with preceding pulse laser

2004 ◽  
Author(s):  
Ilya M. Lachko ◽  
R. V. Volkov ◽  
D. M. Golishnikov ◽  
Vyacheslav M. Gordienko ◽  
M. S. Dzhidzhoev ◽  
...  
Keyword(s):  
Femtosecond Laser ◽  
Pulse Laser ◽  
Laser Plasma ◽  
Plasma Parameters ◽  
Surface Contaminants ◽  
Femtosecond Laser Plasma

Ion‐expansion energy spectra correlated to laser plasma parameters

1973 ◽  
Vol 44 (5) ◽  
pp. 2275-2283 ◽  
Author(s):  
J. N. Olsen ◽  
G. W. Kuswa ◽  
E. D. Jones
Keyword(s):  
Laser Plasma ◽  
Energy Spectra ◽  
Plasma Parameters ◽  
Expansion Energy

scholarly journals Table-top laser-plasma acceleration as an electron radiography source

2006 ◽  
Vol 24 (1) ◽  
pp. 185-190 ◽  
Author(s):  
S.P.D. MANGLES ◽  
B.R. WALTON ◽  
Z. NAJMUDIN ◽  
A.E. DANGOR ◽  
K. KRUSHELNICK ◽  
...  
Keyword(s):  
Energy Spectrum ◽  
High Power ◽  
Laser Plasma ◽  
Magnetic Spectrometer ◽  
Plasma Acceleration ◽  
High Power Laser ◽  
Power Laser ◽  
Accelerated Electrons ◽  
Underdense Plasmas ◽  
Proof Of Principle

A “table-top” high power laser has been used to generate beams of accelerated electrons up to energy of 20 MeV from interactions with underdense plasmas. The energy spectrum of these beams was measured using a magnetic spectrometer and proof-of-principle experiments were performed to evaluate the suitability of these beams for electron radiography applications.

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