High Enthalpy Flow Generation by Dispersed Laser Plasmas Using aSemiconductor Laser Array

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Progress of future space development and space environment utilization requires a next-generation high enthalpy flow wind tunnel. In this study, a semiconductor laser array is used to generate laser-supported plasmas in a linear-like nozzle as a first step of spatially uniform high enthalpy flow generation. In the experiment, we fabricated a device in which a working gas is heated up to become high density plasmas by a semiconductor laser with a convex lens. As the result, we observed high intensity irradiation by the laser plasma at the ignition but could not obtain stable laser supported plasmas. Having put together with the result of numerical analysis, we concluded that higher-output laser is required to have stable laser supported plasmas and high enthalpy flow.