Effect of air pressure on propulsion with TEA CO2 laser

Andrew V. Pakhomov; Jun Lin; Kenneth A. Herren

doi:10.1117/12.547135

20 September 2004 Effect of air pressure on propulsion with TEA CO₂ laser

Andrew V. Pakhomov, Jun Lin, Kenneth A. Herren

Proceedings Volume 5448, High-Power Laser Ablation V; (2004) https://doi.org/10.1117/12.547135
Event: High-Power Laser Ablation, 2004, Taos, New Mexico, United States

Abstract

The assessment of energy partition between air and solid propellant has been conducted using a TEA CO₂ laser. The experiments were performed by focusing output pulses of the laser (200 ns pulsewidth at 10.6 μm wavelength and ~10.6 J pulse energy) on aluminum targets mounted on a ballistic pendulum. Coupling coefficients and mass removal rates were determined as functions of air pressure, which varied from 1 atm to 3.5 mTorr. The data from both coupling coefficients and mass removal rates show that there is a sharp transition region ranging between 1.0 and 10 Torr. In this region the momentum imparted to the target via air breakdown appears comparable and, at higher pressures, dominating the momentum due to the breakdown on the target surface.

Citation Download Citation

Andrew V. Pakhomov, Jun Lin, and Kenneth A. Herren "Effect of air pressure on propulsion with TEA CO₂ laser", Proc. SPIE 5448, High-Power Laser Ablation V, (20 September 2004); https://doi.org/10.1117/12.547135

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