The Influence Of Laser Plasma Ablation Pressure Due To Different Pump Laser

Laser stimulated plasma (LSP) propulsion is the matter of which the laser technology is used in aviation and aerospace fields. The high power laser beam interacts with the working material and makes it become plasma on the surface of it which absorbs the energy of on-coming laser. This procession makes the plasma becoming hotter in temperature and high of pressure. Finally the high temperature and pressure plasma spray from the exit nozzle of equipment, thus producing enormous propulsion force to it. LSP propulsion can overcome the disadvantage of both small ratio of propulsion in traditional chemistry propulsion rocket and small ratio of propulsion/mass in nuclear propulsion equipment.This article simple the transmission attenuation has been made the qualitative analysis to the idodine laser and the CO2 laser in the atmosphere, and obtains the idodine laser the upper air transmission to surpass the CO2 laser in the sunny weather situation, transmitted for the laser target practice in the air has made the upholstery. Simultaneously this article used the non-balance the radiation hydromechanics model to systematically study the physical process whith emphasizes that the long pulse and weak laser affected mutually with the plane carbon target, including laser in plasma dissemination and absorption, plasma hydromechanics development and thermodynamics condition and so on. The consideration equation includes: Plasma hydromechanics system of equations, laser absorption equation, under non-confined thermodynamical equilibrium ionization electronic hold probability speed system of equations, electronic ion conservation of energy system of equations and photon energy transportation equation (three warm systems of equations), as well as description state of matter equation and so on. Regarding the hydromechanics system of equations, we use explicit form of Von the Newman to carry on the solution. Three warm equations include the interrupted thermal conductivity, has electronic and the photon, electronic and the ion energy exchange, these variables and ion density, temperature and atomic physics parameter related, must use the implicit form to their solution, we use the whole linearization iterative scheme iteration solution. In order to calculate the element the opacity, this article obtains under the confined thermodynamical equilibrium condition with the shield kind of hydrogen average atomic model the ion various encasements energy level and the electronic hold number.This article has carried on the massive computations with the above model and the method, gave a laser-target to mutually affect the process the physical image, the plasma state which the laser produced, had the ablative pressure, the laser momentum and so on, and has introduced the different laser intensity to the plasma state, the ablative pressure and the target deviate influence. Value computed result is consistent with the single pulse target practice experiment basically to explain the momentum or the target deviate which increases along with the laser energy increase, only when the laser intensity increases to some continuously momentum and the target deviate increases relatively slowly, therefore constantly through enhances the laser the intensity to increase the laser impetus is not the best means. And the double pulse target was able to have the highest 50% momentum, compared to the single pulse target in the same energy, and which gives the qualitative analysis. This article for further studying the laser and the target affects mutually has provided the reference.