Efficiency of the conversion of radiation energy into kinetic energy of a gas-plasma flow during femtosecond laser ablation of metals in vacuum

Using the methods of combined interferometry, we obtained new data on the momentum coupling coefficient and conversion efficiency of radiation energy into kinetic energy of a gas-plasma stream during femtosecond laser ablation ($\tau\sim45$ fc, $\lambda\sim 800$ nm) of several metals ($\mathrm{Ti}$, $\mathrm{Zr}$, $\mathrm{Mo}$, $\mathrm{Cu}$) in vacuum ($p\sim5\times10^{-2}$ Pa).