Theory of Hot-Electron Spectra at High Laser Intensity

Forslund, D. W.; Kindel, J. M.; Lee, K.

doi:10.1103/physrevlett.39.284

Cited by 327 publications

(123 citation statements)

References 7 publications

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“…In the case of a p-polarized laser beam, it is well known that in experimental conditions similar to ours, the hot electrons could be generated by two mechanisms -resonance absorption (RA) and vacuum heating (VH). RA has been well studied both experimentally [17,18,19,20] and theoretically [21,22,23,24] and based on the observations and simulations, the following scaling law [21] has been established:…”

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confidence: 99%

Role of surface roughness in hard-x-ray emission from femtosecond-laser-produced copper plasmas

et al. 2002

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The hard x-ray emission in the energy range of 30 − 300 keV from copper plasmas produced by 100 fs, 806 nm laser pulses at intensities in the range of 10 15 -10 16 W cm −2 is investigated. We demonstrate that surface roughness of the targets overrides the role of polarization state in the coupling of light to the plasma. We further show that surface roughness has a significant role in enhancing the x-ray emission in the above mentioned energy range.

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confidence: 99%

Role of surface roughness in hard-x-ray emission from femtosecond-laser-produced copper plasmas

et al. 2002

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“…23,24,38,39 However, the exact expression for the temperature depends on many more factors, such as the temperature of the electrons in the overdense plasma region and the scale length of the plasma. 39 In the present investigation, the laser intensity was estimated through a series of reasonable assumptions leading to a lower limit of 10 16 W/cm 2 .…”

Section: Discussionmentioning

confidence: 99%

“…4,23,24,34 The tantalum target ͑atomic number Z͒ is subjected to the assumed electron energy distribution, f (E e ) ͓1/keV͔, and generates a bremsstrahlung distribution, g(E B ), which is modelled according to the expression 35,36 g͑E B ͒Ϸ2ϫ10…”

Section: Theorymentioning

confidence: 99%

“…The main pulse therefore interacts with a plasma with a sharp density profile, and various plasma heating mechanisms, including resonance and vacuum heating, become important. [21][22][23][24] Some electrons penetrate into the surrounding cold metal and bremsstrahlung and characteristic radiation are emitted. We measured a large part of the radiation spectrum in absolute terms through the use of two Ge detectors.…”

Section: Introductionmentioning

confidence: 99%

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High-repetition-rate, hard x-ray radiation from a laser-produced plasma: Photon yield and application considerations

Sjögren

Harbst

Wahlström

et al. 2003

Review of Scientific Instruments

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High-repetition-rate, hard x-ray radiation from a laser-produced plasma: Photon yield and application considerations Sjögren, Anders; Harbst, Michael; Wahlström, Claes-Göran; Svanberg, Sune; Olsson, C Link to publication Citation for published version (APA): Sjögren, A., Harbst, M., Wahlström, C-G., Svanberg, S., & Olsson, C. (2003). High-repetition-rate, hard x-ray radiation from a laser-produced plasma: Photon yield and application considerations. Review of Scientific Instruments, 74(4), 2300-2311. DOI: 10.1063/1.1544054General rights Copyright and moral rights for the publications made accessible in the public portal are retained by the authors and/or other copyright owners and it is a condition of accessing publications that users recognise and abide by the legal requirements associated with these rights.• Users may download and print one copy of any publication from the public portal for the purpose of private study or research.• You may not further distribute the material or use it for any profit-making activity or commercial gain • You may freely distribute the URL identifying the publication in the public portal High-repetition-rate, hard x-ray radiation from a laser-produced plasma: Photon yield and application considerations We present an experimental study of hard x rays produced in laser-produced plasmas. The laser used is a 1 kHz system, delivering 0.7 mJ for 25 fs onto a solid target. The x-ray spectrum was measured with calibrated germanium detectors, allowing a very good estimate of the absolute number of photons emitted from the plasma over a wide energy range; from 7 keV to 0.5 MeV. Assuming a bi-Maxwellian electron distribution with temperatures of 4.5 and 63 keV, theoretical calculations support the experimental findings. The imaging characteristics of the x-ray source were investigated experimentally employing image plates and theoretically based on the electron distribution.

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“…14 The energy spectrum of hot electrons generated by laser pulses has been experimentally and theoretically investigated as a function of the incident laser intensity and wavelength. The average electron energy, usually described as an effective temperature T h , follows a power law as a function of the laser intensity and the wavelength squared (T h ~ (Iλ 2 ) 1/3 ), 4,15 where I is the laser intensity in W/cm 2 and λ is the laser wavelength in μm. To optimize the conversion efficiency of the Kα emission, T h of a few times the Kα photon energy is suggested.…”

Section: Introductionmentioning

confidence: 99%

Monochromatic X-Ray Emission from Laser Produced Plasma with A Clean Ultra-Short Laser Pulse

Zhang

Nishikino²,

Nishimura

et al. 2010

The Review of Laser Engineering

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Theory of Hot-Electron Spectra at High Laser Intensity

Cited by 327 publications

References 7 publications

Role of surface roughness in hard-x-ray emission from femtosecond-laser-produced copper plasmas

Role of surface roughness in hard-x-ray emission from femtosecond-laser-produced copper plasmas

High-repetition-rate, hard x-ray radiation from a laser-produced plasma: Photon yield and application considerations

Monochromatic X-Ray Emission from Laser Produced Plasma with A Clean Ultra-Short Laser Pulse

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