Absorption of Ultrashort Laser Pulses by Solid Targets Heated Rapidly to Temperatures 1–1000 eV

Price, D.; More, R.M.; Walling, R. S.; Guethlein, G.; Shepherd, R.; Stewart, Richard E.; White, William E.

doi:10.1103/physrevlett.75.252

Cited by 283 publications

(89 citation statements)

References 11 publications

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“…Depopulation of the d-band is predicted to affect its binding energy in this manner. [10,11] Also, note that there is no broadening of the Cu 3d upon heating which implies a nonequilibrium distribution of occupied states i.e. spreading of the Fermi-Dirac electron energy distribution.…”

Section: Results/technical Outcomementioning

confidence: 99%

“…For laser heating condition (1) at 300 µJ, the decreasing Cu 3d peak intensity is due to a rapid depopulation of the d-band as the electron temperature T e increases for the resultant metastable phase. [10,11] The temperature dependent depopulation of the valence band d states also creates vacancies in the conduction band (CB) thus allowing intra-atomic absorption below the edge (e.g., 3d-4p transitions in Cu) as observed. In addition, we observe that the Cu 3d peak shifts towards lower kinetic energy (higher binding energy) indicating that the band is 'sinking' in the overall electronic structure of the persistent metastable phase.…”

Section: Results/technical Outcomementioning

confidence: 99%

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FY05 LDRD Final ReportTime-Resolved Dynamic Studies using Short Pulse X-Ray Radiation

Nelson¹,

Dunn²,

Buuren³

et al. 2006

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Established techniques must be extended down to the ps and sub-ps time domain to directly probe product states of materials under extreme conditions. We used short pulse (≤ 1 ps) x-ray radiation to track changes in the physical properties in tandem with measurements of the atomic and electronic structure of materials undergoing fast laser excitation and shock-related phenomena. The sources included those already available at LLNL, including the picosecond X-ray laser as well as the ALS Femtosecond Phenomena beamline and the SSRL based sub-picosecond photon source (SPPS). These allow the temporal resolution to be improved by 2 orders of magnitude over the current state-of-the-art, which is ~100 ps. Thus, we observed the manifestations of dynamical processes with unprecedented time resolution. Time-resolved x-ray photoemission spectroscopy and x-ray scattering were used to study phase changes in materials with sub-picosecond time resolution. These experiments coupled to multiscale modeling allow us to explore the physics of materials in high laser fields and extreme non-equilibrium states of matter. The ability to characterize the physical and electronic structure of materials under extreme conditions together with state-of-the-art models and computational facilities will catapult LLNL's core competencies into the scientific world arena as well as support its missions of national security and stockpile stewardship.

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Section: Results/technical Outcomementioning

confidence: 99%

Section: Results/technical Outcomementioning

confidence: 99%

FY05 LDRD Final ReportTime-Resolved Dynamic Studies using Short Pulse X-Ray Radiation

Nelson¹,

Dunn²,

Buuren³

et al. 2006

View full text Add to dashboard Cite

show abstract

“…2a and 2b, respectively. Previously published data 13 for normal incidence at low intensities are also plotted in Fig. 2a for comparison.…”

Section: Dosimetrymentioning

confidence: 99%

“…A custom-designed 30-cm-diameter integrating sphere calibrated at the laser wavelength of 800 nm was employed to collect the scattered laser light (E scatter ) − the same technique used in previous low-intensity studies 9,10 . The inner wall of the sphere was coated by a Lambertian scattering material − Spectralon, which has a reflectance of > 98% over the spectral range of 300-2000 nm.…”

Section: Absorptionmentioning

confidence: 99%

Short Pulse Laser Absorption and Energy Partition at Relativistic Laser Intensities

Shepherd¹,

Chen²,

Ping³

et al. 2007

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We have performed experiments at the COMET and Calisto short pulse laser facilities to make the first comprehensive measurements of the laser absorption and energy partition in solid targets heated with an ultrashort laser pulse focused to relativistic laser intensities (>10 17 W/cm 2 ). The measurements show an exceedingly high absorption for P polarized laser-target interactions above 10 19 W/cm 2 . Additionally, the hot electron population is observed to markedly increase at the same intensity range. An investigation of the relaxation process was initiated using time-resolved K α spectroscopy. Measurements of the time-resolved K α radiation suggest a 10-20 ps relativistic electron relaxation time. However modeling difficulties of these data are apparent and a more detailed investigation on this subject matter is warranted.

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“…The x-rays are useful as a micron sized x-ray source which has many potential applications like time resolved x-ray diffraction studies and x-ray lithography. Since the absorption of the high intensity (～10 17 W/cm 2 ) ultrashort laser pulses (～100 fs) by planar solid targets is considerably low (～10-20% at normal incidence) [4,5], various types of targets like gratings [6], structured targets [7], predeposited metal clusters [8], gas clusters [9], snow clusters [10] etc. have been used to enhance the coupling of the laser energy in matter.…”

Section: Introductionmentioning

confidence: 99%

Efficient keV X-ray Generation from Irradiation of in-situ Produced Silver Clusters by Ti:sapphire Laser Pulses

Chakravarty¹,

Naik²,

Kumbhare³

et al. 2009

Journal of the Optical Society of Korea

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An experimental study of energy absorption and x-ray emission from ultrashort laser pulse irradiation of in-situ produced solid clusters has been performed. Silver clusters produced by a 30 mJ, 300 ps laser pulse were irradiated up to an intensity of 3×10 17 W/cm 2 by a 70 mJ, 45 fs compressed laser pulse from the same Ti:sapphire laser. Absorption of the laser light exceeding 70% was observed, resulting in an x-ray yield (>1 keV) of ~60 μJ/ pulse. This may constitute a much simpler means of intense x-ray generation using ultrashort laser pulses as compared to the irradiation of structured / pre-deposited cluster targets, and it offers higher x-ray conversion efficiency than that from gas clusters and planar solid targets.

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Absorption of Ultrashort Laser Pulses by Solid Targets Heated Rapidly to Temperatures 1–1000 eV

Cited by 283 publications

References 11 publications

FY05 LDRD Final ReportTime-Resolved Dynamic Studies using Short Pulse X-Ray Radiation

FY05 LDRD Final ReportTime-Resolved Dynamic Studies using Short Pulse X-Ray Radiation

Short Pulse Laser Absorption and Energy Partition at Relativistic Laser Intensities

Efficient keV X-ray Generation from Irradiation of in-situ Produced Silver Clusters by Ti:sapphire Laser Pulses

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