Formation and development dynamics of femtosecond laser microplasma in gases

Bukin, V. V.; Garnov, S. V.; Konov, V. I.; Lozovoĭ, V. I.; Malyutin, A A; Shchelev, M. Ya.; Yatskovskii, I S

doi:10.1070/qe2006v036n07abeh013173

Cited by 26 publications

(15 citation statements)

References 18 publications

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“…Hence laser intensity on the target surface reduces [7]. At that time typical electron concentration of 10 19 -10 20 cm -3 in focal zone of tightly focusing objective is achieved in atmospheric conditions at "vacuum" laser intensity of about 10 16 W/cm 2 [5,6]. The superintense laser radiation also causes the appearance of the third harmonic in air [8].…”

Section: Introductionmentioning

confidence: 96%

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Enhanced x-ray emission from hot plasma produced by double-pulse laser irradiation of solid target at atmospheric conditions

et al. 2007

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We present the results of our experiments directed to the suppression of atmospheric gases influence on delivering of superintense femtosecond laser radiation to solid target at atmospheric conditions.The suppression of atmospheric gases effects is attained by expositing the target to a double-pulse radiation and caused by reducing gas density near the target surface). In our scheme the first pulse (nanosecond UV pulse from XeCl excimer laser) acts as a vacuum pump. The second laser pulse (tightly focused femtosecond pulse) delaying up to several microseconds respect to the first laser pulse delivers the basic energy necessary for switching a hot plasma on the target surface. We have observed the maximum Xray yield increasing up to 17 times under double pulses exposure compare with the single femtosecond pulse regime.

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Section: Introductionmentioning

confidence: 96%

“…The intense ultrashort pulse laser radiation initiates nonlinear optical effects in pure air and gases. As a result, spectral, temporal and spatial characteristics of incident light beams and pulses are modified [5,6]. Intense femtosecond laser radiation (I>10 13 W/cm 2 ) ionizes ambient air.…”

Section: Introductionmentioning

confidence: 99%

Enhanced x-ray emission from hot plasma produced by double-pulse laser irradiation of solid target at atmospheric conditions

et al. 2007

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“…Earlier we reported the technique for precision microinterferometry of micrometre-sized plasmas generated by picosecond laser pulses in gases and optical media (quartz) [1,2]. More recently this technique was substantially modified and employed to investigate a femtosecond microplasma [3,4]. In addition we proposed a method for ultrafast electro-optical recording of the emission spectra of laser-produced microplasma [3, 5 -7].…”

Section: Introductionmentioning

confidence: 99%

Femtosecond laser breakdown of gases and transparent solid states: ultrafast space-time and spectrum-time resolved diagnostics of multicharged microplasma

Garnov

Bukin

Strelkov

et al. 2008

Laser-Induced Damage in Optical Materials: 2008

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We present the results of experimental studies of formation and evolution of multiply ionized (multicharged) laser micro-size plasma produced in gases (air, nitrogen, argon and helium) and inside the transparent solids (fused silica) with high intensity (up to ~ 10 17 W/cm 2 ), ultrashort (τ ~100 fs), 800nm/400nm laser pulses tightly focused in a region of ~1.5 μm in diameter. The measuring techniques and experimental setups for generation and precise optical diagnostics of laser-induced plasma -pump-probe microinterferometry and ultrafast spectroscopy are described. The measured spatiotemporal distributions of plasma refractive index/electron density and plasma spectra are demonstrated. In the experiments, the main attention was paid to the most intriguing initial stage of ultrafast plasma formation and evolution characterized by strong laser-matter and laser-plasma coupling resulting in efficient photoionization of material and plasma heating. We found out that the almost complete ionization (down to nuclei) of the initial gas occurs even at the initial stage of plasma formation. Besides, it was observed, for the first time, that a characteristic time of laser plasma formation considerably (in times) exceeds the duration of the pump laser pulse. This postionization process is attributed to impact ionization of plasma by hot electrons heated due to inverse bremsstrahlung. A theoretical model describing the mechanism of plasma postionization by hot photoelectrons was proposed. We compare the results of the experiments with what the theory predicts -the results of electron density calculations are in good agreement with the experimental data. The dynamics of plasma emission (spectral continuum and spectral line formation) in UV-visible spectral range was investigated with a picosecond time resolution applying the developed ultrafast streak-camera-based spectrometer. The spatiotemporal distributions of refractive index of laser irradiated fused silica were recorded with pump-probe microinterferometry. It was demonstrated that the induced refractive index of laser-matter interaction area changes its sign from the positive to the negative during the laser irradiation and again to the positive one after the laser pulse ends.

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“…Earlier we reported on the techniques for precision microinterferometry of microplasma generated in gases and optical media (quartz) by picosecond laser pulses [1,2]. More recently these techniques were substantially modified and employed to investigate femtosecond microplasmas [3,4]. In addition we proposed a method for ultrafast electro-optical recording the emission spectra of laser-produced microplasma [3,[5][6][7].…”

Section: Introductionmentioning

confidence: 99%

“…More recently these techniques were substantially modified and employed to investigate femtosecond microplasmas [3,4]. In addition we proposed a method for ultrafast electro-optical recording the emission spectra of laser-produced microplasma [3,[5][6][7].…”

Section: Introductionmentioning

confidence: 99%

Ultrafast Space-time and Spectrum-time Resolved Diagnostics of Multicharged Femtosecond Laser Microplasma

Garnov¹,

Bukin²,

Malyutin³

et al. 2009

AIP Conference Proceedings

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Articles you may be interested inWall current probe: A non-invasive in situ plasma diagnostic for space and time resolved current density distribution measurement Rev. Sci. Instrum. 84, 083502 (2013); Abstract. We present the review of the recent experimental studies of fundamental mechanisms of femtosecond laser plasma formation and evolution performed in A.M. Prokhorov General Physics Institute of Russian Academy of Sciences. The main object we dealt with was the microsized plasma produced in gases with high intensity (up to 5xlO" W/cm^), tightly focused (to a few microns in diameter) IR and UV femtosecond laser pulses. The main attention in the experiments was paid to the initial stage of microplasma formation and evolution characterized by strong laser-plasma coupling resulting in efficient ionization and heating of the medium, distortion of laser beam, and nonlinear spectral conversion of laser radiation to the continuum and laser harmonics. Using a precise pump-probe micro-interferometric technique the dynamics of plasma was studied with femtosecond time-resolution in a wide density range -from a minimal detectable electron concentration (lO" cm"') to the almost total (down to nuclei) ionization of ions occurred under femtosecond excitation. The obtained time-dependences of plasma density were analyzed. It was observed, for the first time, that a characteristic time of femtosecond laser plasma formation in gases considerably (in times) exceeds the duration of the pump laser pulse. This postionization process is attributed to impact ionization of plasma by hot electrons. We compare the results of the experiments with what the developed theory predicts. Using an ultrafast streak-camera-based spectroscopy technique the temporal evolution of microplasma emission and the dynamics of spectral lines formation in UV-visible range were studied with picosecond time-resolution.

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Formation and development dynamics of femtosecond laser microplasma in gases

Cited by 26 publications

References 18 publications

Enhanced x-ray emission from hot plasma produced by double-pulse laser irradiation of solid target at atmospheric conditions

Enhanced x-ray emission from hot plasma produced by double-pulse laser irradiation of solid target at atmospheric conditions

Femtosecond laser breakdown of gases and transparent solid states: ultrafast space-time and spectrum-time resolved diagnostics of multicharged microplasma

Ultrafast Space-time and Spectrum-time Resolved Diagnostics of Multicharged Femtosecond Laser Microplasma

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