Abstract
The optical diagnostics effort at Gifu University has been successful in the implosion phase of laser irradiation experiments-A fringe selectable micorscopicinterferometer was developed for the quality selection of the gas-filled glassmicroballoon; The implosion process was revealed by a stroboscopicshado; wgraph; Transition from ionizing to non-ionizing shock wave was also detected by the samemethod; A successful laser irradiation of freely-falling glass microballon was obtained.