Uniform line focus and multitarget coupling for the creation of near-water-window nickel-like x-ray laser

To obtain high gain saturated amplification soft x-ray lasing output, uniform and long amplification medium must be created by focusing and target set-up technology. We report on the cylindrical lens array and multi target coupling system for creating uniform line focus. Through these methods, serial x-ray lasing with the wavelength towards the wavelength of water window are obtained on the GekkoXII Nd glass laser facility in ILE, Osaka, University.