Direct Impulse Measurements of Ablation Processes from Laser-Surface Interactions

D’Souza, Brian; Ketsdever, Andrew D.

doi:10.21236/ada435844

Cited by 11 publications

(3 citation statements)

References 8 publications

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“…As the laser intensity is increased, plasma formation increases and has a greater shielding effect. [6] We also contrast the experimental results with the calculation results of Phipps' scaling law [7] . According to the Phipps' scaling law, for pulsewidth on the order of 7ns, the intensity for which C m is maximized should occur around 7×10 8 W/cm 2 .…”

Section: Resultsmentioning

confidence: 96%

Experimental study of laser ablative process on man-made space debris

Xing¹,

Shen²,

Ye³

et al. 2013

SPIE Proceedings

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A threat to spacecraft in long-term low earth orbits is the high probability of impacts with small particles of man-made space debris in 1-cm to 10-cm size range. One possible solution for 1-10 cm size debris is to de-orbit the particles with a ground or space based laser. A modified torsional impulse balance system has been developed as a diagnostic tool to study fundamental laser ablative process on different material such as aluminum, titanium, magnesium and carbon fiber composite that are frequently used in spacecraft. Of particular interest is the force due to process of laser ablation as well as the impulse coupling coefficient. It can be concluded from the experimental result that for the experimental materials, with the increasing laser intensity, the coupling coefficient increase firstly and then decrease and it reaches the maximum at some value when the laser intensity varies around 10 9 W/cm 2 . And the experimental data compares well with the calculation result according to Phipps' scaling law. As we extend the previous research, it will provide a reference for the study in cleaning man-made space debris by laser.

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Section: Resultsmentioning

confidence: 96%

Experimental study of laser ablative process on man-made space debris

Xing¹,

Shen²,

Ye³

et al. 2013

SPIE Proceedings

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“…Torsion pendula have also been addressed; e.g. in [7,8,9]. Piezoelectric force sensors were investigated mainly at UAH; important issues include, e.g., frequency cutoffs, impulse reflection [10], restitution behavior of targets [11], and minimization of noise arising through metal-metal impacts.…”

Section: Impulse Measurementmentioning

confidence: 99%

Laser Propulsion Standardization Issues

Scharring¹,

Eckel²,

Röser³

et al. 2010

AIP Conference Proceedings

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It is a relevant issue in the research on laser propulsion that experimental results are treated seriously and that meaningful scientific comparison is possible between groups using different equipment and measurement techniques. However, critical aspects of experimental measurements are sparsely addressed in the literature. In addition, few studies so far have the benefit of independent confirmation by other laser propulsion groups. In this paper, we recommend several approaches towards standardization of published laser propulsion experiments. Such standards are particularly important for the measurement of laser ablation pulse energy, laser spot area, imparted impulse or thrust, and mass removal during ablation. Related examples are presented from experiences of an actual scientific cooperation between NU and DLR. On the basis of a given standardization, researchers may better understand and contribute their findings more clearly in the future, and compare those findings confidently with those already published in the laser propulsion literature. Relevant ISO standards are analyzed, and revised formats are recommended for application to laser propulsion studies.

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“…ALP has two types of thrust generation; direct ablation [13] and confined ablation [14]. In direct ablation, the target uses a small part of laser energy while the other dissipates due to inverse bremsstrahlung and plasma shielding, which results in lower thrust generation.…”

Section: Introductionmentioning

confidence: 99%

Effect of plasma confinement on laser ablation propulsion parameters by using external semi-elliptical cavities for Aluminum and Silver propellants

et al. 2023

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Ablative laser propulsion (ALP) is a type of beam-powered propulsion in which thrust is produced by ablating a target using a high-intensity laser beam. In this research work, we calculated the ALP parameters momentum coupling coefficient (Cm) and specific impulse (Isp) by confining the plasma with the help of external semi-elliptical cavities. The cavity minor axis was fixed at 2.5mm while the major axis varied to 7mm, 9mm, 11mm, 13mm and 15mm. Silver and aluminum samples were used as propellants. A pulsed Q-smart Nd: YAG laser operating at 532nm wavelength was used to ablate the target. A significant increase in the value of Cm and Isp was observed using confined ablative propulsion. The highest Cm and Isp were recorded for the 9 mm major axis cavity, for which Cm was increased from 5.01x10-5 N-s/J to1.75x10-4 nearly 249% for silver and from 3.4x10-5 N-s/J to 8.9x10-5 N-s/J nearly 161% for aluminum. Hence the use of semielliptical cavities is an effective technique for enhancing propulsion parameters. Cavity acts as a trap for plasma and shockwaves. Confinement of plasma and reflection of shockwaves from the cavity walls results in enhanced laser ablation propulsion parameters.

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Direct Impulse Measurements of Ablation Processes from Laser-Surface Interactions

Cited by 11 publications

References 8 publications

Experimental study of laser ablative process on man-made space debris

Experimental study of laser ablative process on man-made space debris

Laser Propulsion Standardization Issues

Effect of plasma confinement on laser ablation propulsion parameters by using external semi-elliptical cavities for Aluminum and Silver propellants

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