Soft X-ray emission from molybdenum plasmas generated by dual laser pulses

Lokasani, Ragava; Arai, Goki; Kondo, Yoshiki; Hara, Hiroyuki; Dinh, Thanh-Hung; Ejima, Takeo; Hatano, Tadashi; Jiang, Weihua; Makimura, Tetsuya; Li, Bowen; Dunne, Padraig; O'Sullivan, Gerry; Higashiguchi, Takeshi; Limpouch, J.

doi:10.1063/1.4967310

Cited by 21 publications

(12 citation statements)

References 28 publications

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“…One of such methods can be double-pump medium excitation, which is often used for spectral analysis, X-ray generation and plasma studies [11][12][13]. In THz science, this technique has demonstrated its effectiveness for increasing the output power of THz radiation.…”

Section: Introductionmentioning

confidence: 99%

Double-pump technique – one step closer towards efficient liquid-based THz sources

Ponomareva¹,

Tcypkin²,

Smirnov³

et al. 2019

Opt. Express

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By irradiating a water jet with double pulses, we demonstrate 4-fold higher THz wave generation than for a single pump pulse. The dependence of the enhanced THz signal on the temporal delay between two collinear pulses reveals the optimal time for launching signal pulse is near 2-4 ps, which corresponds to the time needed to create the complete pre-ionization state when sufficient electron density is already induced, and there is no plasma reflection of the pump pulse radiation. The increase in THz waves generation efficiency corresponds to the case of water jet excitation by the pulses with an optimal duration for a certain jet thickness, which is determined by the spatial pulse size. Using a theoretical model of the interaction of a high-intensity sub-picosecond pulse with an isotropic medium, we held a numerical simulation, which well describes the experimental results when using 3 ps value of population relaxation time. Thus, in this work, double pump method allows not only to increase the energy of the generated THz waves, but also to determine the characteristic excited state lifetime of liquid water. The optical-to-terahertz conversion efficiency in case of double pulse excitation of water column is of the order of 0.5·10 −3 , which exceeds the typical values for THz waves generation during two-color filamentation in air and comparable with the achievable values due to the optical rectification in some crystals.

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Section: Introductionmentioning

confidence: 99%

Double-pump technique – one step closer towards efficient liquid-based THz sources

Ponomareva¹,

Tcypkin²,

Smirnov³

et al. 2019

Opt. Express

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show abstract

“…Whilst in recent years enhanced effort has directed on large-scale facilities such as synchrotrons, free electron lasers and extreme light infrastructure beamlines for soft x-ray and extreme ultraviolet (XUV) research, such sources are still not always readily available for easy access by the research community. At the laboratory scale, plasma sources, either discharge or laser produced, can be adopted for applications in water-window imaging [1], extreme ultraviolet metrology [2] and emission/absorption spectroscopy [3]. Although the development of discharge-based XUV sources has progressed well in the last decade these still exhibit lifetime issues concerning possible repetitive usage.…”

Section: Introductionmentioning

confidence: 99%

Soft x-ray spectral analysis of samarium plasmas produced by solid-state laser pulses

Lokasani

Sheil

Barte

et al. 2018

J. Phys. B: At. Mol. Opt. Phys.

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XUV spectra of 150 ps laser-produced samarium (Sm) plasmas in the 1.8-10 nm wavelength region, where Δn=1, n=4−n=5 and Δn=0, n=4−n=4 transitions dominate the observed emission, were investigated experimentally and theoretically. Ab initio calculations using the flexible atomic code, as well as consideration of isoelectronic trends, are all employed to identify a number of new features in spectra from Sm 16+ to Sm 34+ . The results show that Δn=0, n=4−n=4 emission from highly charged ions merge to form an intense unresolved transition arrays in the 7.5 nm region and Δn=1, n=4−n=5 resonance transitions contribute in the 3-7 nm region of the Sm spectrum. In addition, a number of strong individual lines at shorter wavelengths are seen to arise from Cu-and Zn-like ions and a number of new assignments are made for Zn-like Sm 32+ .

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“…influence of a prepulse in the X-ray generation has been proved in several experiments (see for example [35][36][37][38][39][40][41][42][43]). The observed enhancement is related with the increased coupling of the stronger second laser pulse with an expanding plasma -created by the first weaker pulse-from the target surface.…”

Section: X-ray Emission By Double Pulsesmentioning

confidence: 99%

X-ray emission from a liquid curtain jet when irradiated by femtosecond laser pulses

et al. 2017

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Laser-based sources of ionizing radiation have attracted a considerable attention in the last years for their broad potential applications. However the stability and robustness of such sources is still an issue that needs to be addressed. Aiming to solve such problems, we propose a source that uses a liquid jet -rather than a solid-as a target for the production of X-rays. Liquid jets offer always a clean surface for every laser shot which represent a clear advantage over solids. In this work, we present an experimental characterization of the X-ray emission of such targets, and study the efficiency of the process when two temporally delayed pulses are used. According to the obtained results, the X-ray yield is comparable with commonly used targets.

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Soft X-ray emission from molybdenum plasmas generated by dual laser pulses

Cited by 21 publications

References 28 publications

Double-pump technique – one step closer towards efficient liquid-based THz sources

Double-pump technique – one step closer towards efficient liquid-based THz sources

Soft x-ray spectral analysis of samarium plasmas produced by solid-state laser pulses

X-ray emission from a liquid curtain jet when irradiated by femtosecond laser pulses

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