Terawatt femtosecond Cr : forsterite laser system

Агранат, М. Б.; Ашитков, С. И.; Иванов, А. А.; Konyashchenko, A. V.; Овчинников, А. В.; Фортов, В. Е.

doi:10.1070/qe2004v034n06abeh002714

Cited by 64 publications

(22 citation statements)

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“…A source of radiation was a chromium-doped forsterite laser system generating pulses of 80 fs duration with energy up to 80 mJ at a wavelength of =1.24 µm [1]. The photon energy at main frequency 0.98 eV was less than a width of the forbidden band =1.12 eV for silicon.…”

Section: Methodsmentioning

confidence: 99%

Interferometric measurement of melt depth in silicon using femtosecond infrared Cr:forsterite laser

Ашитков

Овчинников

Агранат

2012

AIP Conference Proceedings

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Section: Methodsmentioning

confidence: 99%

Interferometric measurement of melt depth in silicon using femtosecond infrared Cr:forsterite laser

Ашитков

Овчинников

Агранат

2012

AIP Conference Proceedings

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“…Cross-sectional laser beam radius L R in the pump pulse was varied in the range from 30 µm to 22 Molecular dynamics simulations and both experimental methods (microinterferometry and Newton rings) show that the spallation plate thickness decreases with laser fluence increasing. It is demonstrated by the curvature of the interference strips and the appearance of the Newton rings.…”

Section: Comparison Of Experimental Data With Theoretical Modelmentioning

confidence: 99%

Nanospallation induced by a femtosecond laser pulse

et al. 2007

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In the present work phenomena are considered related to the interaction of ultra-short laser pulses, τ L~ 0.1 ps, with metallic targets. The absorption of laser pulse results in formation of thin layer of hot electrons strongly superheated ( i e T T >> ) relative to the ion temperature, i T . Initial thickness of the layer heat d is small, δ heat d , where δ~ 10 nm is the skin layer thickness. Subsequent developments include the following stages: (1) Propagation of electron thermal wave which expands the hot layer heat d ; (2) Cooling of electrons due to energy transfer to cold ions; (3) Onset of hydrodynamic motion that constitutes the rarefaction wave with positive pressure; (4) Further expansion of target material leading to the appearance of negative pressure; and (5) Long separation process which begins with nucleation of voids and goes on to the total separation of spallation plate. The thickness of the plate is ~ 10 nm (we call it nanospallation). Theoretical model involves two-temperature hydrodynamic equations with semiempirical EOS for a metal, electron heat conduction and electron-ion energy exchange. The decay of metastable strongly stretched matter is described by molecular dynamics (MD) simulation with extremely large number of atoms. The experimental setup includes femtosecond chromium-forsterite laser operating in the pump-probe regime. The experiments are performed with gold target. Measured ablation threshold for gold is 1.35 J/cm 2 of incident pump light at inclination 45 0 , ppolarization. Calorimeter measurements give for the absorbed fluence abs F = 0.3 inc F , therefore the threshold value of abs F is 0.4 J/cm 2 .

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“…The experiments were performed using a terawatt femtosecond pulsed chromium-forsterite laser [2] at the Femtosecond Laser Complex of the Institute for High Energy Densities (Associated Institute for High Temperatures, Russian Academy of Sciences, Moscow). P-polarized laser radiation with a wavelength of 1240 nm and a pulse duration of τ = 80 fs was incident on a sample surface at an angle of 35 ° .…”

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confidence: 99%

10.1007/s11455-008-2010-x

2010

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Optical damage thresholds for the surface of sodium and potassium chloride crystals irradiated by 80-fs laser pulses have been determined. P -polarized terawatt radiation of a chromium-forsterite laser operating at a wavelength of 1240 nm was incident on a sample surface at an angle of 35 ° . The optical damage of the crystal surface was observed when the electric field strength reached a critical level of 76 MV/cm for NaCl and 64 MV/cm for KCl.

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Terawatt femtosecond Cr : forsterite laser system

Cited by 64 publications

References 1 publication

Interferometric measurement of melt depth in silicon using femtosecond infrared Cr:forsterite laser

Interferometric measurement of melt depth in silicon using femtosecond infrared Cr:forsterite laser

Nanospallation induced by a femtosecond laser pulse

10.1007/s11455-008-2010-x

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