scholarly journals Large Spectral Shift of Reflected Radiation From Laser Plasmas Generated by High Contrast KrF Laser Pulses

2020 ◽  
Vol 8 ◽  
Author(s):  
Zsolt Kovács ◽  
Barnabás Gilicze ◽  
Sándor Szatmári ◽  
István B. Földes
Keyword(s):  
Laser Pulses ◽  
Spectral Shift ◽  
High Contrast ◽  
Laser Plasmas ◽  
Krf Laser

scholarly journals Reflectivity and spectral shift from laser plasmas generated by high-contrast, high-intensity KrF laser pulses

2020 ◽  
Vol 378 (2184) ◽  
pp. 20200043 ◽  
Author(s):  
Zs. Kovács ◽  
K. Bali ◽  
B. Gilicze ◽  
S. Szatmári ◽  
I. B. Földes
Keyword(s):  
Fusion Energy ◽  
Blue Shift ◽  
Laser Pulses ◽  
High Gain ◽  
Spectral Shift ◽  
Laser Plasmas ◽  
Energy Part ◽  
Fourier Filtering ◽  
Krf Laser ◽  
Vacuum Heating

The energy and spectrum of the reflected 248 nm radiation are studied from solid targets up to 1.15 × 10 18  W cm −2 intensity. The experiments used the 700 fs directly amplified pulses of the KrF system which was cleaned from prepulses with the new Fourier-filtering method providing 12 orders of magnitude temporal contrast. Increasing the intensity from 10 15  W cm −2 results in increasing absorption up to more than 90% above 10 18  W cm −2 . This is accompanied by increasing x-ray conversion exhibiting a less steep power law dependence for low-Z matter than for gold. Strong blue shift of the reflected radiation from the backward propagating plasma was observed. It is shown that in the case of KrF laser pulses of highest contrast, vacuum heating can be one of the dominant absorption mechanisms. This article is part of a discussion meeting issue ‘Prospects for high gain inertial fusion energy (part 1)’.

scholarly journals Calculation of atomic excitation processes of X-ray laser plasmas irradiated by short-pulse intense KrF laser pulses

1993 ◽  
Vol 11 (1) ◽  
pp. 25-30 ◽  
Author(s):  
A. Sasaki ◽  
H. Yoneda ◽  
K. Ueda ◽  
H. Takuma
Keyword(s):  
Short Pulse ◽  
Laser Pulses ◽  
Atomic Model ◽  
Efficient Production ◽  
X Ray ◽  
Atomic Excitation ◽  
Laser Plasmas ◽  
Krf Laser ◽  
Laser Design ◽  
Excitation Processes

An atomic model of the laser-produced Al plasma has been developed and used to analyze excitation processes of recombination pumping soft X-ray lasers. A soft X-ray gain for H-like Balmer-α line and He-like 3d-2p transition in short-pulse intense KrF laser (IL = 1014–1015 W/cm2, T = 10–100 ps)-produced Al plasmas are calculated for various laser temporal pulse shapes to find the condition for efficient production of population inversion. Results from different models are compared and requirements for the atomic model for X-ray laser design are discussed.

Characterization of columns grown during KrF laser micromachining of Al2O3–TiC ceramics

2003 ◽  
Vol 18 (5) ◽  
pp. 1123-1130 ◽  
Author(s):  
V. Oliveira ◽  
R. Vilar
Keyword(s):  
Electron Microscopy ◽  
Photoelectron Spectroscopy ◽  
Laser Pulses ◽  
Formation Mechanisms ◽  
X Ray ◽  
Reducing Conditions ◽  
Transmission Electron ◽  
Column Formation ◽  
Krf Laser

This paper aims to contribute to the understanding of column formation mechanisms in Al2O3–TiC ceramics micromachined using excimer lasers. Chemical and structural characterization of columns grown in Al2O3–TiC composite processed with 200 KrF laser pulses at 10 J/cm2 was carried out by scanning electron microscopy, transmission electron microscopy, x-ray photoelectron spectroscopy, and x-ray diffraction analysis. Fully developed columns consist of a core of unprocessed material surrounded by an outer layer of Al2TiO5, formed in oxidizing conditions, and an inner layer, formed in reducing conditions, composed of TiC and Al3Ti or an AlTi solid solution. Possible mechanisms of column formation are discussed.

scholarly journals Probing ultrafast dynamics of solid-density plasma generated by high-contrast intense laser pulses

2018 ◽  
Vol 25 (1) ◽  
pp. 013102 ◽  
Author(s):  
Kamalesh Jana ◽  
David R. Blackman ◽  
Moniruzzaman Shaikh ◽  
Amit D. Lad ◽  
Deep Sarkar ◽  
...  
Keyword(s):  
Laser Pulses ◽  
Intense Laser ◽  
Ultrafast Dynamics ◽  
High Contrast ◽  
Solid Density ◽  
Intense Laser Pulses ◽  
Density Plasma

Doping and crystallization of amorphous SiGe films with an excimer (KrF) laser

1995 ◽  
Vol 10 (8) ◽  
pp. 1884-1888 ◽  
Author(s):  
S. Krishnan ◽  
M.I. Chaudhry ◽  
S.V. Babu
Keyword(s):  
Silicon Germanium ◽  
Room Temperature ◽  
Laser Pulses ◽  
Laser Exposure ◽  
Silicon Substrates ◽  
A Value ◽  
Crystal Film ◽  
Krf Laser ◽  
Amorphous Silicon Germanium

Amorphous silicon germanium (a-SiGe) films, deposited on silicon substrates at room temperature in a molecular beam epitaxy system, were transformed into a single-crystal film and doped with phosphorus by exposure to KrF laser pulses. Electron channeling patterns showed that laser exposure resulted in crystallization of the undoped a-SiGe films. The SiGe films were doped by laser irradiation, using a phosphorus spin-on-dopant. The sheet resistance of the doped films decreased with increasing numbers of pulses, reaching a value of about ∼ 5 × 104 ohms/□ after 15 pulses. I-V data from mesa-type n-SiGe/p-Si diode devices were used to determine the effect of laser processing on the quality of the SiGe films.

Generation of high-contrast subpicopulses by single-stage 110-fold compression of YAG:Nd3+laser pulses

1987 ◽  
Vol 17 (4) ◽  
pp. 415-416 ◽  
Author(s):  
Evgenii M Dianov ◽  
Aleksandr Ya Karasik ◽  
P V Mamyshev ◽  
A M Prokhorov ◽  
D G Fursa
Keyword(s):  
Laser Pulses ◽  
Single Stage ◽  
High Contrast

Vaporization of aluminum by 50 ps KrF laser pulses

1996 ◽  
Vol 80 (1) ◽  
pp. 509-512 ◽  
Author(s):  
Y. Y. Tsui ◽  
R. Fedosejevs ◽  
C. E. Capjack
Keyword(s):  
Laser Pulses ◽  
Krf Laser

scholarly journals Guiding femtosecond high-intensity high-contrast laser pulses by copper capillaries

2015 ◽  
Vol 22 (10) ◽  
pp. 103111 ◽  
Author(s):  
K. V. Lotov ◽  
K. V. Gubin ◽  
V. E. Leshchenko ◽  
V. I. Trunov ◽  
E. V. Pestryakov
Keyword(s):  
High Intensity ◽  
Laser Pulses ◽  
High Contrast

scholarly journals Efficient hard X-ray source using femtosecond plasma at solid targets with a modified surface

2004 ◽  
Vol 22 (3) ◽  
pp. 301-306 ◽  
Author(s):  
S.A. GAVRILOV ◽  
D.M. GOLISHNIKOV ◽  
V.M. GORDIENKO ◽  
A.B. SAVEL'EV ◽  
R.V. VOLKOV
Keyword(s):  
Experimental Data ◽  
Surface Layer ◽  
Laser Pulses ◽  
Hot Electron ◽  
High Contrast ◽  
X Ray ◽  
Corrugated Surface ◽  
Fs Laser ◽  
Modified Surface ◽  
Modified Surface Layer

Recent results on constructing of an efficient hard X-ray source using solid targets irradiated by high-contrast 200-fs laser pulses with an intensity above 1016W/cm2are presented. We used different solid targets with a laser- and electrochemically modified surface layer: craters, pyramidal cavities, porous silicon, gratings. Experimental data obtained confirms that using solid targets with a corrugated surface one can achieve a prominent increase both in the efficiency of hard X-ray generation (in the quanta range 2–30 keV) and in the hot electron temperature of plasma.

Fast ion acceleration from thin foils irradiated by ultra-high intensity, ultra-high contrast laser pulses

2011 ◽  
Vol 99 (12) ◽  
pp. 121504 ◽  
Author(s):  
R. Prasad ◽  
A. A. Andreev ◽  
S. Ter-Avetisyan ◽  
D. Doria ◽  
K. E. Quinn ◽  
...  
Keyword(s):  
High Intensity ◽  
Laser Pulses ◽  
Ion Acceleration ◽  
High Contrast ◽  
Thin Foils ◽  
Fast Ion
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