Experimental investigation of the dynamics of laser-induced gas-plasma flows under femtosecond laser ablation of copper in vacuum

Loktionov, E. Yu.; Protasov, Yu. S.

doi:10.1134/s0030400x13110155

Cited by 5 publications

(2 citation statements)

References 67 publications

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“…Eq. (5), whereas the jet velocity appears to be limited which is in good agreement with experimental data for various metals, 13,14) whereas other metals exhibit a decreasing or even increasing trend of I sp with increasing fluence.…”

Section: Specific Impulsesupporting

confidence: 88%

“…13) However, a theoretical description of momentum coupling which would allow for variation and optimization of laser parameters is only available for the short-pulse regime. 5,14) For ultrashort pulses, in contrast, simulations on laser-ablative propulsion using the so-called Two-TemperatureModel 15) (TTM) have not been reported from other groups for the authors' knowledge which implies that a comprehensive comparison of laser-ablative propulsion with short versus ultrashort pulses is missing as well.…”

Section: Scope Of Workmentioning

confidence: 99%

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Numerical Simulations on Laser-Ablative Micropropulsion with Short and Ultrashort Laser Pulses

Scharring

Lorbeer

Eckel

2016

AEROSPACE TECHNOLOGY JAPAN

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Aiming for the generation of high-precision thrust in the µN range, focused high-intensity laser pulses are used employing the recoil of the jet of the ablated material. Whereas a single laser pulse yields an extremely low impulse bit in the range of several nNs, a broad thrust range can be accessed by the variation of the laser pulse repetition rate up to several hundreds of kilohertz. A detailed laser parameter study is carried out for aluminum and gold as propellant varying the pulse length from 100 fs to 10 ns and the fluence from 0.09 to 23.8 J/cm 2 . Two different regimes of thruster operation with respect to laser pulse length and specific impulse are identified. Irrespective of the pulse length regime, optimum impulse coupling is found at laser spot fluences around 2 J/cm 2 for aluminum and 20 J/cm 2 for gold, respectively, with coupling coefficients in the range of 25 to 40 µN/W. For ultrashort pulses, jet velocities are rather small yielding a specific impulse in the range of 70 s to 200 s, whereas for longer pulses beyond ≈ 100 ps, I sp is found to be in the range of 500 to 1000 s and beyond enabling low propellant consumption. However, ultrashort-pulse laser ablation might be favorable since material can be removed very smoothly which might contribute to very low thrust noise.

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Section: Specific Impulsesupporting

confidence: 88%