Theoretical research on Ni-like Ag 13.9 nm X-ray laser driven by 3 μm or 6 μm wavelength laser

In order to understand the good qualities of the laser driving scheme with grazing incidence against to the scheme with normal incidence,the schemes of Ni-like Ag driven by normal incident lasers with long wavelengths of 6 μm and 3 μm were studied.Results show that for X-ray laser of Ni-like Ag,adopting laser with 6 μm and 3 μm wavelength,the laser energy mainly deposites on gain region or nearby,the electronic temperature on gain region dramatically increases and the gain coefficients dramatically increase too.With 3 μm wavelength laser,using 5 J driven laser energy,an effective gain of 20.7 cm~(-1) and a deeply saturated gain with a gain length product being 41.4 can be obtained.Comparing to 1ω laser driven,only 19% driven laser energy is needed,and the effective gain increases 60%.With 6 μm wavelength laser,using 15 J driven laser energy,an effective gain of 21.2 cm~(-1) and a deeply saturated gain with an effective gain length product of 42.4 can be obtained.Comparing to 1ω laser driven,only 57% driven laser energy is needed,and the effective gain increases 64%.