Laser induced vapor bubbles in cryogenic liquids
in the large K region is due to the smoothing out of ripple by the diffraction. If the atomic density is nonuniform along the radial direction of laser beam, such an effect must be added in the analysis. The effects on the ionization efficiency of target atoms due to the abovementioned analyses will also be presented. *Department of Electric and Electronics Engineering, Ryukyu University 2-Senbaru, Nishihara, Okinawa 903-02, Japan *'Institute for Laser Technology 2-6, Yamadaoka, Suita, Osaka 565, Japan