Broadband emission spectrum dynamics of large water droplets exposed to intense ultrashort laser radiation

Geints, Yu. É.; Kabanov, A. M.; Matvienko, Gennadii G.; Oshlakov, V. K.; Zemlyanov, A. A.; Golik, S. S.; Букин, О. А.

doi:10.1364/ol.35.002717

Cited by 19 publications

(6 citation statements)

References 11 publications

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“…It is much weaker for negative chirps. This line may be the oxygen atomic multiplet OI(3p 5 P -3s 5 S) centered at 777.4 nm in the plasma generated in air by the filaments [24,25]. This line would subsequently be Rabi-shifted due to the high intensity, as recently observed by Compton et al [26].…”

Section: -3supporting

confidence: 52%

1-J white-light continuum from 100-TW laser pulses

et al. 2011

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We experimentally measured the supercontinuum generation using 3-J, 30-fs laser pulses and measured whitelight generation at the level of 1 J. Such high energy is allowed by a strong contribution to the continuum by the photon bath, as compared to the self-guided filaments. This contribution due to the recently observed congestion of the filament number density in the beam profile at very high intensity also results in a wider broadening for positively chirped pulses rather than for negatively chirped ones, similar to broadening in hollow-core fibers.

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Section: -3supporting

confidence: 52%

1-J white-light continuum from 100-TW laser pulses

et al. 2011

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“…(c) For the impact of a droplet onto a solid surface the typical interaction time is equal to the deformation time τ e = R/U , where U is the impact speed of the droplet (image taken from Josserand & Thoroddsen (2016)). Geints et al 2010;Avila & Ohl 2016). These mechanisms could have a strong influence on the droplet response.…”

Section: Introductionmentioning

confidence: 99%

Droplet deformation by short laser-induced pressure pulses

2017

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(Received xx; revised xx; accepted xx)When a free-falling liquid droplet is hit by a laser it experiences a strong ablation driven pressure pulse. Here we study the resulting droplet deformation in the regime where the ablation pressure duration is short, i.e. comparable to the time scale on which pressure waves travel through the droplet. To this end an acoustic analytic model for the pressure-, pressure impulse-and velocity fields inside the droplet is developed in the limit of small density fluctuations. This model is used to examine how the droplet deformation depends on the pressure pulse duration while the total momentum to the droplet is kept constant. Within the limits of this analytic model, we demonstrate that when the total momentum transferred to the droplet is small the droplet shape-evolution is indistinguishable from an incompressible droplet deformation. However, when the momentum transfer is increased the droplet response is strongly affected by the pulse duration. In this later regime, compressed flow regimes alter the droplet shape evolution considerably.

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“…The complete vaporization or even explosion of micrometer-sized drops can result from the linear absorption of laser energy [1][2][3]. Self-focussing and dielectric breakdown may lead to plasma formation in transparent drops [4][5][6][7]. Laser impact has been used to generate liquid motion by vaporization or plasma formation in confined geometries [8][9][10], sessile drops [11], and biological matter [12][13][14].…”

Section: Introductionmentioning

confidence: 99%

Drop Shaping by Laser-Pulse Impact

et al. 2015

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We show how the deposition of laser energy induces propulsion and strong deformation of an absorbing liquid body. Combining high speed with stroboscopic imaging, we observe that a millimeter-sized dyed water drop hit by a millijoule nanosecond laser pulse propels forward at several meters per second and deforms until it eventually fragments. The drop motion results from the recoil momentum imparted at the drop surface by water vaporization. We measure the propulsion speed and the time-deformation law of the drop, complemented by boundary-integral simulations. The drop propulsion and shaping are explained in terms of the laser-pulse energy, the drop size, and the liquid properties. These findings are, for instance, crucial for the generation of extreme ultraviolet light in nanolithography machines.

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Broadband emission spectrum dynamics of large water droplets exposed to intense ultrashort laser radiation

Cited by 19 publications

References 11 publications

1-J white-light continuum from 100-TW laser pulses

1-J white-light continuum from 100-TW laser pulses

Droplet deformation by short laser-induced pressure pulses

Drop Shaping by Laser-Pulse Impact

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