Enhancement of x-ray line emission from plasmas produced by short high-intensity laser double pulses

Andreev, Alexander A.; Limpouch, J.; Iskakov, Alexey B.; Nakano, H.

doi:10.1103/physreve.65.026403

Cited by 49 publications

(20 citation statements)

References 27 publications

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“…or even higher Nakano et al, 2001!, and the pulse length may be considerably shorter. While the intense resonance lines are emitted from femtosecond laser-produced plasmas for 10 ps or morẽ Andreev et al, 2002!, intense K-a pulses shorter than 250 fs have already been detected~Feurer et al, 2001a!. Moreover, the optimum laser intensities for efficient emission of short K-a pulses from low and middle Z elements are much below the relativistic threshold~Reich et al, 2000!, and thus, relatively small and cheap table-top femtosecond lasers with high repetition rates are suitable for laser-driven ultrafast X-ray sources.…”

Section: Introductionmentioning

confidence: 99%

Numerical studies on the ultrashort pulseK-α emission sources based on femtosecond laser–target interactions

et al. 2004

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K-a emission is an intense short-pulse line source well suited for X-ray diagnostic techniques with subpicosecond and micrometer resolution. Numerical simulations are performed here in a search for laser-target interaction regimes where both high efficiency of laser energy transformation to X-ray emission and ultrashort X-ray pulses are achieved. We use the one-dimensional PIC code for the description of the laser interaction with the plasma layer at the target surface. Fast electron transport into the target is treated by our newly developed Monte Carlo code with temporal resolution that is described here in detail. Our simulations reveal extremely short ;200 fs FWHM bright K-a X-ray pulses emitted from targets heated by 120-fs pulses of a table-top laser. Laser energy conversion efficiency to K-a line emission as high as 6 ϫ10 Ϫ5 is noticed. Integration of the emitted energy over the focal spot is carried out to improve the simulation accord with published experimental data. Negligible impact of self-induced electric fields on K-a emission is found for conducting target materials at moderate laser intensities Շ10 17 W0cm 2 .

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Section: Introductionmentioning

confidence: 99%

Numerical studies on the ultrashort pulseK-α emission sources based on femtosecond laser–target interactions

et al. 2004

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“…For bursts with shorter inter-pulse delay, it was reported that plasma shielding limits the removal efficiency [14] while longer delays cause highenergy plasma generation that is explosively remelting the surface, in turn increasing surface roughness significantly [11]. In case of pulse-train processing with very short picosecond inter-pulse delay, by contrast, electron/ion yield [15][16][17], plasma intensity [18][19][20][21], and phonon temperature [17,[22][23][24][25][26] increase as a result of enhanced photon efficiency. For the latter, temperature simulations indicate that inter-pulse delay of 10 ps or less is optimal for maximum heating.…”

Section: Introductionmentioning

confidence: 99%

Experimental study on double-pulse laser ablation of steel upon multiple parallel-polarized ultrashort-pulse irradiations

et al. 2016

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In this paper, double-pulse laser processing is experimentally studied with the aim to explore the influence of ultrashort pulses with very short time intervals on ablation efficiency and quality. For this, sequences of 50 double pulses of varied energy and inter-pulse delay, as adjusted between 400 fs and 18 ns by splitting the laser beam into two optical paths of different length, were irradiated to technical-grade stainless steel. The depth and the volume of the craters produced were measured in order to evaluate the efficiency of the ablation process; the crater quality was analyzed by SEM micrographs. The results obtained were compared with craters produced with sequences of 50 single pulses and energies equal to the double pulse. It is demonstrated that double-pulse processing cannot exceed the ablation efficiency of single pulses of optimal fluence, but the ablation crater surface formed smoother if inter-pulse delay was in the range between 10 ns and 18 ns. In addition, the influence of pulse duration and energy distribution between the individual pulses of the double pulse on ablation was studied. For very short inter-pulse delay, no significant effect of energy variation within the double pulse on removal rate was found, indicating that the double pulse acts as a big single pulse of equal energy. Further, the higher removal efficiency was achieved when double-pulse processing using femtosecond pulses instead of picosecond pulses.

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“…Using a laser prepulse can also enhance or reduce x-ray yield depending on laser and target conditions. Andreev et al have investigated enhancement of spectral line x-ray yield from a solid target when a laser prepulse precedes the main pulse [28]. They showed that maximum conversion efficiency can be achieved when an optimum delay time is applied between the prepulse and main pulse.…”

Section: Introductionmentioning

confidence: 99%

Numerical study of picosecond soft x-ray enhancement from porous targets irradiated by double laser pulses

2010

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Enhancement of x-ray line emission from plasmas produced by short high-intensity laser double pulses

Cited by 49 publications

References 27 publications

Numerical studies on the ultrashort pulseK-α emission sources based on femtosecond laser–target interactions

Numerical studies on the ultrashort pulseK-α emission sources based on femtosecond laser–target interactions

Experimental study on double-pulse laser ablation of steel upon multiple parallel-polarized ultrashort-pulse irradiations

Numerical study of picosecond soft x-ray enhancement from porous targets irradiated by double laser pulses

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