Wavelength Scaling of Soft X-ray Lasers Pumped by Fast Capillary Discharges

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Based on experimental results, numerical simulations, and an analytical model for amplification process of stimulated radiation in inhomogeneous laser mediums, the potentiality of fast capillary discharge plasma as a pumping source of soft X-ray laser is discussed. Z-discharges driven by fast pulse power generator can make axi-symmetric and high energy density plasmas with large aspect ratio. With well controlled pre-ionization, it makes the rapidly imploding z-pinch plasma with good reproducibility. In contrast to laser excited scheme, the discharge pumping uses compression process for making the high energy density plasma. Thus the plasma at final compression phase can be controlled so as to make optimum parameter and structure of plasma for pumping the laser line. In this scheme, there are a lot of control parameters such as the initial gas pressure, the diameter, the peak current and the rise time of drive current. A prospect for the operation at shorter wavelength region was discussed and we could conclude that with optimization of those discharge parameters, we can expect large energy output at soft X-ray region.