Soft x-ray emission, angular distribution of hot electrons, and absorption studies of argon clusters in intense laser pulses

Liu, Yunquan; Dong, Quan; Peng, Xiaomin; Jin, Z.; Zhang, Jie

doi:10.1063/1.3125308

Cited by 12 publications

(4 citation statements)

References 40 publications

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“…The development of such high-intensity and ultra-short lasers has many practical applications in the compact X-ray sources [6][7][8][9], the fast ignition scheme for inertial-confinement fusion studies [10], particle acceleration [11][12][13], remote sensing of the atmosphere [14], attosecond pulse generation [15][16][17], and artificial lightning [18,19].…”

Section: Introductionmentioning

confidence: 99%

Spatiotemporal Evolution of Intense Short Gaussian Laser Pulses in Weakly Relativistic Magnetized Plasma

Olumi

Maraghechi

2016

Contrib. Plasma Phys.

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Key words High-intensity lasers, ultra-short pulses, relativistic nonlinearity, self-focusing in plasma, selfcompression in plasma.The weakly relativistic regime of propagation of a short and intense laser pulse in the magnetized plasma is investigated. By considering relativistic nonlinearity and using non-linear Schrödinger equation with paraxial approximation, two second-order coupled differential equations are obtained for the longitudinal pulse width parameter (in time) and for the transverse pulse width parameter (in space). The simultaneous evolution of spot size and length of a relativistic Gaussian laser pulse in a magnetized plasma can be calculated by the numerical solution of the equations. The effect of magnetic field is investigated. It is observed that in the presence of magnetic field both the self-compression and the self-focusing can be enhanced. Furthermore, the interplay between the longitudinal self-compression and the transverse self-focusing in a magnetized plasma is investigated.

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Section: Introductionmentioning

confidence: 99%

Spatiotemporal Evolution of Intense Short Gaussian Laser Pulses in Weakly Relativistic Magnetized Plasma

Olumi

Maraghechi

2016

Contrib. Plasma Phys.

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“…Potential laboratory-scale WW-transmission x-ray microscopy (TXM) sources are soft x-ray lasers, 6,7 laser-produced plasma (LPP) sources, [8][9][10][11] and higher harmonics from laser heated targets. 12,13 WW sources based on LPPs have several advantages over other sources that include power scalability through the tuning of laser parameters, good dose control, flexibility in dimensions, spatial stability, minimum heat load, and a large solid angle of collection.…”

Section: Introductionmentioning

confidence: 99%

Effects of excitation laser wavelength on Ly-α and He-α line emission from nitrogen plasmas

et al. 2013

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Laser-produced nitrogen plasmas emitting radiation at 2.48 nm (Ly-α) and 2.88 nm (He-α) are considered potential efficient sources for water-window (WW) microscopy. The atomic and optical properties of nitrogen plasma and influence of the laser wavelength on the line emission in the WW range are investigated. It is found that the optimal temperatures for maximum emission from Ly-α and He-α spectral lines are 40-60 eV and 80-100 eV, respectively. The WW line emission and the conversion efficiency (CE) are estimated for three distinct Nd:YAG laser wavelengths (1064 nm, 532 nm, and 266 nm). The calculated CEs are compared with experimentally observed CE values. It is found that 1064 nm wavelength provides the highest CE from laser to Ly-α and He-α radiation.

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“…e.g. the coefficient 0.74 is missing [78]; α is mistakenly stated as the opening angle of the cone [79]. tested.…”

Section: Clusters In Gas Jetsmentioning

confidence: 99%

Characterization of cluster/monomer ratio in pulsed supersonic gas jets

Gao

Shim

Downer

2008

2008 Conference on Lasers and Electro-Optics

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Zhao, who shared happiness and helped me weather the stress and frustration during my PhD life.Finally, I owe much to my parents, Fangjun Gao and Yadi Gong, and my sister, Yangbo Gao, for their endless love and unconditional support throughout my life, especially in the past seven years when I was studying overseas. Xiaohui GaoThe University of Texas at Austin Cluster mass fraction is an elusive quantity to measure, calculate or estimate accurately for pulsed supersonic gas jets typical of intense laser experiments. The optimization of this parameter is critical for transient phasematched harmonic generation in an ionized cluster jet at high laser intensity. We present an in-depth study of a rapid, noninvasive, single-shot optical method of determining cluster mass fraction f c (r,t) at specified positions r within, and at time t after opening the valve of, a high-pressure pulsed supersonic gas jet. A ∼ 2 mJ fs pump pulse ionizes the monomers, causing an immediate drop in the jet's refractive index n jet proportional to monomer density, while simultaneously initiating hydrodynamic expansion of the clusters.The latter leads to a second drop in n jet that is proportional to cluster density and is delayed by ∼ 1 ps. A temporally stretched probe pulse measures the 2-step index evolution in a single shot by frequency domain holography, enabling recovery of f c . We present the theory behind recovery of f c in detail.vii We also present extensive measurements of spatio-temporal profiles f c (r, t) of cluster mass fraction in a high-pressure supersonic argon jet for various values of backing pressure P , and reservoir temperature T .viii

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Soft x-ray emission, angular distribution of hot electrons, and absorption studies of argon clusters in intense laser pulses

Cited by 12 publications

References 40 publications

Spatiotemporal Evolution of Intense Short Gaussian Laser Pulses in Weakly Relativistic Magnetized Plasma

Spatiotemporal Evolution of Intense Short Gaussian Laser Pulses in Weakly Relativistic Magnetized Plasma

Effects of excitation laser wavelength on Ly-α and He-α line emission from nitrogen plasmas

Characterization of cluster/monomer ratio in pulsed supersonic gas jets

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