Propagation of laser absorption waves under the action of 10.6 $\mu m$ wavelength radiation

The results are given of an experimental investigation into the parameters of laser absorption waves, propagating under the action of radiation of wavelength 10.6 $\mu m$ at power densities of $q=2-10$ MW/cm${}^2$. The data obtained on the dynamics of their development and on the temperature, optical properties, and pressures at the target and in the plasma are compared with calculations of the parameters of laser absorption waves using the theories of optical detonation and subsonic radiation waves. These comparisons lead to the conclusion that a laser absorption wave propagating under the action of radiation of wavelength $\lambda=10,6\mu m$ is a subsonic radiation wave. Quantitative discrepancies between the experimental and theoretical data are explained as due to the existence of a mechanism for increasing the capture rate $\omega$ of a mass of gas by the radiation wave. Possible mechanisms for increasing $\omega$ include nonequilibrium heating of the electrons and the inducing of turbulent gas flow at the subsonic radiation wave front.