No abstract available

[en] XUV interferometry is a unique tool for accurate metrology based on phase modification. X-ray lasers are very bright and short-duration sources that give opportunity to make interferometry of fast-evolving phenomena, such as dense plasmas or surface deformations due to external fields. In particular, picosecond resolution has been obtained by using transient collisional X-ray lasers produced by CPA infrared lasers. (author)

[en] We have examined the interaction of intense laser fields with Xe clusters by measuring the energy distributions of emitted ions using the ultrafast 20-fs laser pulses. This work demonstrates that the energetic-particle emission can be optimized by manipulating the characters of the ultrafast laser pulses, i.e. the pulse duration and sign of chirp. (author)

[en] Numerous applications of protons and ions accelerated by laser radiation require charged particle beams of high quality (i.e., such that the ratio of the energy width of the beam to its mean energy is small). In order to produce beams with controlled quality, it is proposed to use two-layer targets in which the first layer consists of heavy multicharged ions and the second layer (thin and narrow in the transverse direction) consists of protons. The possibility of generating a high-quality proton beam in the interaction of ultraintense laser radiation with such a two-layer target is demonstrated by three-dimensional particle-in-cell computer simulations. (author)

[en] Scheme to collect effectively by rotating laser produced ions in the longitudinal phase space with use of an RF electric field synchronized to the high-power short-pulse laser has been developed. Results of experimental studies performed with 12 TW, 50 fs pulse laser to prepare the real explosion of 100 TW, 20 fs laser are presented together with the design of the RF cavity for phase rotation. (author)

[en] This report consists of 67 contributed papers of the Fourth Symposium on Advanced Photon Research, which was held at JAERI Advanced Photon Research Center in Kyoto on November 28-29, 2002. The numbers of speeches were 14, including 5 invited speeches, and the numbers of poster presentations were 62, including FY 2001 joint research and cooperative research presentations. The 66 of the presented papers are indexed individually. (J.P.N.)

[en] In the A=180 region, isomers which are excited states in nuclei with comparatively long half-lives arise due to the symmetry of nuclear shapes around the principal axis. This symmetry is related to the K quantum number, and therefore the associated isomers are called K isomers. Here we report on recent results of nuclear structure studies for high-K isomers, and discuss the related physics particularly using high intensity photons such as laser Compton scattering gamma rays and laser induced gamma rays. (author)

[en] Nitrogen gas target was irradiated by a linearly polarized ultra-short pulse of Ti:Sapphire laser light with duration of 50 fs and energy of 150 mJ. We changed the direction of the polarization of the incident laser light and observed the emission of the resonance series lines of the lithiumlike ions and radiative recombination spectrum from recombining helium-like ions. (author)

[en] In this study, we study control of atomic and molecular processes by laser fields. Combination of theory of nonadiabatic transition and Floquet formalism provides several new schemes of laser control. Examples shown here are, (1) One-photon and two photon selective excitation of atoms, and (2) Selective dissociation of HI molecule. Numerical calculations are made to examine the efficiency and robustness. (author)

[en] Resolution of optical microlithography process becomes smaller and smaller. Wavelength of the light source for these optical lithography reduced from KrF, ArF to F₂ to meet the resolution requirement. Recently EUV is spotlighted as promising candidate for next generation lithography light source. This paper summarizes the requirement and issue for the EUV lithography light source. (author)