This paper reports the results of KrF laser-plasma interaction experiments including measuring techniques. X-ray measurement is an important method for high density plasma where visible lights have not transparence. Computer programs have been developed to analyze X-ray crystal spectrometer data. Ablating plasma condition and X-ray radiation transport are observed with using these techniques. On the other hand, a disadvantage of short-wavelength laser has been found.
Uniformity is a key issue for high efficiency and high density compression of the fuel.
Therefore, the letter half of this paper is devoted to uniform irradiation technique of laser beams. Random-phase plats are effective for infrared and visible laser wavelength. Spatial Fourier transformation has been attempted to evaluate the spatially random data. This technique improve the laser beam irradiation uniformity, and the relaxation effect in the plasma is not necessary. The measured beam smoothing effect of BRP has well agreed with the theoretically expected value in the spatial frequency domain.