Design of an Ultrahigh-Gain Ni-like Kr Soft-X-Ray Laser by Use of an Optical-Field-Induced Ionization-Initiated Transient Collisional Excitation Scheme

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We propose a Ni-like Kr soft X-ray laser operating on the $4d{^{1}S_{0}}$–$4p{^{1}P_{1}}$ transition at 32.6 nm by a novel excitation scheme. In this scheme, Ni-like ions are prepared with almost 100% abundance by optical-field-induced ionization and the inverse bremsstrahlung heats the plasma efficiently. The numerical simulation predicts that an ultrahigh gain greater than 1000 cm-1 is achievable in low-density plasma ($N_{\text{e}}=5.6\times 10^{19}$ cm-3) for a driving laser intensity of $1.75\times 10^{16}$ W/cm2. With longitudinal pumping, an output energy greater than 40 $\mu$J and an energy efficiency of $7\times 10^{-5}$ are expected with 200 Torr Kr gas.
Publication Office, Japanese Journal of Applied Physics, Faculty of Science, University of Tokyoの論文
2001-01-15