Dependence of keV x‐ray generation on the temporal and spatial separation of two KrF laser pulses

1994 ◽  
Vol 76 (9) ◽  
pp. 5047-5053 ◽  
Author(s):  
R. Bobkowski ◽  
J. N. Broughton ◽  
R. Fedosejevs ◽  
R. J. Willis ◽  
M. R. Cervenan
Keyword(s):  
Spatial Separation ◽  
Laser Pulses ◽  
X Ray ◽  
Krf Laser ◽  
Temporal And Spatial

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.

Efficiency of 1.5-4.5 keV x-ray production from 2 ps duration KrF laser pulses incident onto solid targets

2002 ◽  
Vol 35 (11) ◽  
pp. 1117-1122 ◽  
Author(s):  
S J Pestehe ◽  
G J Tallents ◽  
I C E Turcu ◽  
Y Abou Ali ◽  
G Hirst ◽  
...  
Keyword(s):  
Laser Pulses ◽  
X Ray ◽  
Krf Laser

scholarly journals Enhancement of X-ray emission from nanocolloidal gold suspensions under double-pulse excitation

2018 ◽  
Vol 9 ◽  
pp. 2609-2617 ◽  
Author(s):  
Wei-Hung Hsu ◽  
Frances Camille P Masim ◽  
Armandas Balčytis ◽  
Hsin-Hui Huang ◽  
Tetsu Yonezawa ◽  
...  
Keyword(s):  
Laser Pulses ◽  
Main Pulse ◽  
Double Pulse ◽  
Pulse Excitation ◽  
Laser Beam Propagation ◽  
Pulse Irradiation ◽  
X Ray ◽  
Near Ir ◽  
Ir Laser ◽  
Temporal And Spatial

Enhancement of X-ray emission was observed from a micro-jet of a nano-colloidal gold suspension in air under double-pulse excitation of ultrashort (40 fs) near-IR laser pulses. Temporal and spatial overlaps between the pre-pulse and the main pulse were optimized for the highest X-ray emission. The maximum X-ray intensity was obtained at a 1–7 ns delay of the main pulse irradiation after the pre-pulse irradiation with the micro-jet position shifted along the laser beam propagation. It was revealed that the volume around gold nanoparticles where the permittivity is near zero, ε ≈ 0, accounts for the strongest absorption, which leads to the effective enhancements of X-ray emission.

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.

Soft x‐ray emission from plasmas produced by ultraintense KrF‐laser pulses in colloidal Al

1996 ◽  
Vol 68 (10) ◽  
pp. 1338-1340 ◽  
Author(s):  
C. Wülker ◽  
W. Theobald ◽  
D. R. Gnass ◽  
F. P. Schäfer ◽  
J. S. Bakos ◽  
...  
Keyword(s):  
Laser Pulses ◽  
X Ray ◽  
Krf Laser

scholarly journals Conversion of laser light into soft X rays with 3-ns and 30-ps laser pulses

1991 ◽  
Vol 9 (2) ◽  
pp. 551-562 ◽  
Author(s):  
K. Eidmann ◽  
W. Schwanda
Keyword(s):  
Laser Light ◽  
Laser Energy ◽  
Short Pulse ◽  
Laser Pulses ◽  
X Rays ◽  
Incident Laser ◽  
X Ray ◽  
Transmission Grating ◽  
Incident Laser Energy ◽  
Temporal And Spatial

The X-ray emission from planar targets made of aluminum, copper, or gold irradiated by a frequency-doubled Nd laser (530-nm wavelength and 1012–1014-W/cm2 laser intensity) was measured at two pulse durations: 3 ns and 30 ps. We absolutely measured the X-ray emission with spectral, temporal, and spatial resolution in the wavelength range 3 Å < λ < 250 Å by using filtered bolometers, a transmission grating spectrometer, X-ray diodes, and an X-ray streak camera as diagnostics. In addition, the absorption of laser light was measured. For the short, 30-ps laser pulse the conversion of incident laser energy into X rays was considerably less than that with the long, 3-ns pulse. This is caused by less absorption of laser light and, in addition, by less conversion of absorbed laser energy into X rays in the case of the short pulse. The results are compared with numerical simulations performed with the MULTI hydrocode.

Space and Time Distribution of Hard X-Ray Emission in a Loop at the Beginning of a Flare

1994 ◽  
Vol 144 ◽  
pp. 275-277
Author(s):  
M. Karlický ◽  
J. C. Hénoux
Keyword(s):  
Time Distribution ◽  
Electron Bombardment ◽  
Spatial Evolution ◽  
Superthermal Electrons ◽  
Flare Loop ◽  
X Ray ◽  
Superthermal Electron ◽  
Flare Loops ◽  
Chromospheric Evaporation ◽  
Temporal And Spatial

AbstractUsing a new ID hybrid model of the electron bombardment in flare loops, we study not only the evolution of densities, plasma velocities and temperatures in the loop, but also the temporal and spatial evolution of hard X-ray emission. In the present paper a continuous bombardment by electrons isotropically accelerated at the top of flare loop with a power-law injection distribution function is considered. The computations include the effects of the return-current that reduces significantly the depth of the chromospheric layer which is evaporated. The present modelling is made with superthermal electron parameters corresponding to the classical resistivity regime for an input energy flux of superthermal electrons of 109erg cm−2s−1. It was found that due to the electron bombardment the two chromospheric evaporation waves are generated at both feet of the loop and they propagate up to the top, where they collide and cause temporary density and hard X-ray enhancements.

Transient collisional excitation X-ray laser generation with picoseconds laser pulses

2001 ◽  
Vol 11 (PR2) ◽  
pp. Pr2-39-Pr2-42 ◽  
Author(s):  
M. Kado ◽  
T. Kawachi ◽  
N. Hasegawa ◽  
M. Tanaka ◽  
K. Sukegawa ◽  
...  
Keyword(s):  
Laser Pulses ◽  
Laser Generation ◽  
Collisional Excitation ◽  
X Ray

Hard X-ray radiation and fast particle generation using multiterawatt laser pulses

1999 ◽  
Vol 169 (1) ◽  
pp. 72 ◽  
Author(s):  
Aleksandr A. Andreev ◽  
V.E. Yashin ◽  
Aleksandr V. Charukhchev
Keyword(s):  
Laser Pulses ◽  
Fast Particle ◽  
X Ray ◽  
Particle Generation

scholarly journals Single- and two-color attosecond hard x-ray free-electron laser pulses with nonlinear compression

2020 ◽  
Vol 2 (4) ◽  
Author(s):  
Alexander Malyzhenkov ◽  
Yunieski P. Arbelo ◽  
Paolo Craievich ◽  
Philipp Dijkstal ◽  
Eugenio Ferrari ◽  
...  
Keyword(s):  
Free Electron ◽  
Free Electron Laser ◽  
Laser Pulses ◽  
X Ray ◽  
Nonlinear Compression
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