Laser energy absorption and x-ray generation in nanowire arrays irradiated by relativistically intense ultra-high contrast femtosecond laser pulses

2022 ◽  
Vol 29 (1) ◽  
pp. 013301
Author(s):  
E. Eftekhari-Zadeh ◽  
M. S. Blümcke ◽  
Z. Samsonova ◽  
R. Loetzsch ◽  
I. Uschmann ◽  
...  
Keyword(s):  
Femtosecond Laser ◽  
Energy Absorption ◽  
Laser Energy ◽  
Laser Pulses ◽  
Femtosecond Laser Pulses ◽  
Nanowire Arrays ◽  
High Contrast ◽  
X Ray ◽  
Laser Energy Absorption

scholarly journals Absolute laser energy absorption measurement of relativistic 0.7 ps laser pulses in nanowire arrays

2021 ◽  
Vol 28 (2) ◽  
pp. 023302
Author(s):  
J. Park ◽  
R. Tommasini ◽  
R. Shepherd ◽  
R. A. London ◽  
C. Bargsten ◽  
...  
Keyword(s):  
Energy Absorption ◽  
Laser Energy ◽  
Laser Pulses ◽  
Absorption Measurement ◽  
Nanowire Arrays ◽  
Laser Energy Absorption

scholarly journals Clean source of soft X-ray radiation formed in supersonic Ar gas jets by high-contrast femtosecond laser pulses of relativistic intensity

2020 ◽  
Vol 8 ◽  
Author(s):  
Maria Alkhimova ◽  
Sergey Ryazantsev ◽  
Igor Skobelev ◽  
Alexey Boldarev ◽  
Jie Feng ◽  
...  
Keyword(s):  
Laser Pulse ◽  
Femtosecond Laser ◽  
Argon Plasma ◽  
Plasma Source ◽  
Laser Pulses ◽  
Femtosecond Laser Pulses ◽  
Average Charge ◽  
High Contrast ◽  
X Ray ◽  
Gas Jets

In this work, we optimized a clean, versatile, compact source of soft X-ray radiation $(E_{\text{x}\text{-}\text{ray}}\sim 3~\text{keV})$ with an yield per shot up to $7\times 10^{11}~\text{photons}/\text{shot}$ in a plasma generated by the interaction of high-contrast femtosecond laser pulses of relativistic intensity $(I_{\text{las}}\sim 10^{18}{-}10^{19}~\text{W}/\text{cm}^{2})$ with supersonic argon gas jets. Using high-resolution X-ray spectroscopy approaches, the dependence of main characteristics (temperature, density and ionization composition) and the emission efficiency of the X-ray source on laser pulse parameters and properties of the gas medium was studied. The optimal conditions, when the X-ray photon yield reached a maximum value, have been found when the argon plasma has an electron temperature of $T_{\text{e}}\sim 185~\text{eV}$ , an electron density of $N_{\text{e}}\sim 7\times 10^{20}~\text{cm}^{-3}$ and an average charge of $Z\sim 14$ . In such a plasma, a coefficient of conversion to soft X-ray radiation with energies $E_{\text{x}\text{-}\text{ray}}\sim 3.1\;(\pm 0.2)~\text{keV}$ reaches $8.57\times 10^{-5}$ , and no processes leading to the acceleration of electrons to MeV energies occur. It was found that the efficiency of the X-ray emission of this plasma source is mainly determined by the focusing geometry. We confirmed experimentally that the angular distribution of the X-ray radiation is isotropic, and its intensity linearly depends on the energy of the laser pulse, which was varied in the range of 50–280 mJ. We also found that the yield of X-ray photons can be notably increased by, for example, choosing the optimal laser pulse duration and the inlet pressure of the gas jet.

A Soft X-Ray Radiation Source Formed in Supersonic Argon Gas Jets under the Action of High-Contrast Femtosecond Laser Pulses of Relativistic Intensity

2020 ◽  
Vol 46 (3) ◽  
pp. 275-278
Author(s):  
M. A. Alkhimova ◽  
S. N. Ryazantsev ◽  
I. Yu. Skobelev ◽  
M. D. Mishchenko ◽  
A. S. Boldarev ◽  
...  
Keyword(s):  
Femtosecond Laser ◽  
Radiation Source ◽  
Laser Pulses ◽  
Femtosecond Laser Pulses ◽  
High Contrast ◽  
Argon Gas ◽  
X Ray ◽  
Gas Jets

scholarly journals Characterization of X-ray radiation from solid Sn target irradiated by femtosecond laser pulses in the presence of air plasma sparks

2016 ◽  
Vol 34 (3) ◽  
pp. 533-538 ◽  
Author(s):  
A. Curcio ◽  
M. Anania ◽  
F.G. Bisesto ◽  
A. Faenov ◽  
M. Ferrario ◽  
...  
Keyword(s):  
Femtosecond Laser ◽  
Near Infrared ◽  
Laser Energy ◽  
Laser System ◽  
Laser Pulses ◽  
Femtosecond Laser Pulses ◽  
X Rays ◽  
Air Plasma ◽  
X Ray ◽  
Near Infrared Spectra

AbstractThe emission of X-rays from solid tin targets irradiated by low-energy (few mJ) femtosecond laser pulses propagated through air plasma sparks is investigated. The aim is that to better understand the X-ray emission mechanism and to show the possibility to produce proper radiation for spectroscopic and imaging applications with a table-top laser system. The utilization of a controlled ultrashort prepulse is found necessary to optimize the conversion efficiency of laser energy into Lα radiation. The optimum contrast between the main pulse and the controlled prepulse is found about 102. A correlation between the laser contrast value and the laser near-infrared spectra at the exit of the plasma spark is observed.

scholarly journals Источник мягкого рентгеновского излучения, формируемый в сверхзвуковых газовых струях аргона под действием высококонтрастных фемтосекундных лазерных импульсов релятивистской интенсивности

2020 ◽  
Vol 46 (6) ◽  
pp. 23
Author(s):  
М.А. Алхимова ◽  
С.Н. Рязанцев ◽  
И.Ю. Скобелев ◽  
М.Д. Мищенко ◽  
А.C. Болдарев ◽  
...  
Keyword(s):  
Femtosecond Laser ◽  
Conversion Coefficient ◽  
Laser Pulses ◽  
Femtosecond Laser Pulses ◽  
High Contrast ◽  
Optimal Conditions ◽  
Fast Electrons ◽  
X Ray ◽  
Laser Produced Plasma

We investigated the opportunity to create a soft X-ray source in laser-produced plasma without concomitant fast electrons generation. The x-ray source has been created under the interaction of high-contrast relativistic femtosecond laser pulses with super-sonic Argon jets. Optimal conditions when conversion coefficient to soft x-ray at the range 2.9 – 3.3 keV reached 8.57 ·10^(-5) have been found.

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