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 mm were studied. Results show that for X-ray laser of Ni-like Ag, adopting laser with 6 μm and 3 mm 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 mm 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 1w laser driven, only 19% driven laser energy is needed, and the effective gain increases