Screening of a surface vaporizing under laser bombardment, at temperature and ionization disequilibrium
The kinetics of the process through which vapor released from the surface of a solid is heated by laser radiation are calculated. The data indicate the existence of temperature and ionization disequilibrium (for Al at incident flux densities q over 50 MW/cm2 in times of the order of 1μsec or less). Treatment of this disequilibrium lowers the “critical” flux density q* corresponding to the onset of screening within a specified time t, or within the time t* required for screening to develop at a specified flux density q, appreciably, as compared to the values obtained in the equilibrium theory of the process. Some of the other physical processes that might have some effect on “flare” behavior are also discussed.