Scaling laws for temperature and reflectivity of plasma generated by a short neodymium laser pulse

Donaldson, T. P.; Balmer, J. E.; Zimmermann, J.

doi:10.1088/0022-3727/13/7/017

Cited by 16 publications

(7 citation statements)

References 37 publications

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“…The initial plasma temperature and density assumption is based on reported plasma parameters under similar irradiation conditions. 49,52,53 The profiles of pressure, temperature, mass density, and the y-component of velocity (velocity along the target normal direction) are shown in Fig. 8 for different times.…”

Section: Modeling Resultsmentioning

confidence: 99%

Experimental and computational study of complex shockwave dynamics in laser ablation plumes in argon atmosphere

et al. 2012

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We investigated spatio-temporal evolution of ns laser ablation plumes at atmospheric pressure, a favored condition for laser-induced breakdown spectroscopy and laser-ablation inductively coupled plasma mass-spectrometry. The 1064 nm, 6 ns pulses from a Nd:YAG laser were focused on to an Al target and the generated plasma was allowed to expand in 1 atm Ar. The hydrodynamic expansion features were studied using focused shadowgraphy and gated 2 ns self-emission visible imaging. Shadowgram images showed material ejection and generation of shock fronts. A secondary shock is observed behind the primary shock during the time window of 100-500 ns with instabilities near the laser cone angle. By comparing the self-emission images obtained using fast photography, it is concluded that the secondary shocks observed in the shadowgraphy were generated by fast moving target material. The plume front estimates using fast photography exhibited reasonable agreement with data obtained from shadowgraphy at early times ≤400 ns. However, at later times, fast photography images showed plume confinement while the shadowgraphic images showed propagation of the plume front even at greater times. The structure and dynamics of the plume obtained from optical diagnostic tools were compared to numerical simulations. We have shown that the main features of plume expansion in ambient Ar observed in the experiments can be reproduced using a continuum hydrodynamics model which provided valuable insight into the expansion dynamics and shock structure of the plasma plume.

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Section: Modeling Resultsmentioning

confidence: 99%

Experimental and computational study of complex shockwave dynamics in laser ablation plumes in argon atmosphere

et al. 2012

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“…Whenever the breakdown plasma reaches the critical density, it becomes opaque for the further coming laser radiation [48,50,52] In [46], the physical mechanisms involved into the action of a plasma shutter in the medium infrared spectral range were studied using pulsed CO 2 laser radiation. The laser beam was passed through an iris of 170-m radius placed in center of a Ti target.…”

Section: Mechanisms and Characteristic Timesmentioning

confidence: 99%

Laser–Plasma Interactions

Mihăilescu

Hermann²

2010

Laser Processing of Materials

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The purpose of the present chapter is to give an introduction into the physics of laser plasma interactions that govern the coupling of laser energy into the matter. Processes induced by laser pulses of nano-and femtosecond durations are discussed in the framework of different applications. In particular, the roles of non-linear absorption and avalanche ionization in plasma heating are discussed and a critical review of related experimental and theoretical studies is given. 4 Laser-Plasma Interactions 51 electrons, is related to the number of electrons inside the Debye sphere having a volume V D D 4 3 D 3 . 1 We have

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“…The obvious discrepancy between predicted and measured absolute values of the temperature may be explained by the fact that the measured temperatures are determined from the plasma X-ray emission originating from the cooler overdense plasma (Donaldson et al 1980), whereas the code calculates the maximum temperature at critical density. In figure 7 the electron temperature predicted by the model is shown to scale with a power law exponent of -0-44.…”

Section: N E (X T = T O ) = N Ec Exp\2--j and V P (Xt = T 0 ) =mentioning

confidence: 99%

Self-consistent calculations of short-pulse laser-heated plasma dynamics

Lädrach

Balmer

1983

Laser Part. Beams

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A one-dimensional, time-dependent fluid code is presented that numerically solves the hydrodynamic equations together with the wave equation for a picosecond pulse laser heated plasma. The laser light absorption by classical inverse bremsstrahlung and the ponderomotive force are evaluated self-consistently from the computed electromagnetic field quantities. At oblique incidence of p-polarized 1-054/xm laser radiation the resonant electric field is saturated by plasma wave convection through the nonlinear density profile steepening prior to wave breaking.

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Scaling laws for temperature and reflectivity of plasma generated by a short neodymium laser pulse

Cited by 16 publications

References 37 publications

Experimental and computational study of complex shockwave dynamics in laser ablation plumes in argon atmosphere

Experimental and computational study of complex shockwave dynamics in laser ablation plumes in argon atmosphere

Laser–Plasma Interactions

Self-consistent calculations of short-pulse laser-heated plasma dynamics

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