Nonlinear compression of naturally down-chirped superradiance pulses from a free-electron laser oscillator by thick germanium plates
H. Zen, R. Hajima, and H. Ohgaki, Optics Express, 31, pp.40928-40936 (2023).

Dissosication process of polyalanine aggregates by free electron laser irradiation
H. Okumura, S. G. Itoh, H. Zen, and K. Nakamura, PLOS ONE, 18(9): e0291093 (2023).

The Particle-Tracking Simulation of a New Photocathode RF Gun in the Free-Electron Laser Facility, KU-FEL
Y. Zhao, H. Zen, and H. Ohgaki, Particles, 6, 638-646 (2023). 

Formation of periodic surface structures on semiconductors under mid-infrared free-electron laser irradiation
S. Masuno, M. Hashida, and H. Zen, IEEJ Transactions on Fundamentals and Materials,  143, pp.320-324 (2023)

Full characterization of superradiant pulses from a free-electron laser oscillator
H. Zen, R. Hajima, and H. Ohgaki, Scientific Reports, 13, 6350 (2023).

Study of Crystalline Scintillator Response with Development of Single-Electron Beam of 2-6 MeV at KU-FEL

Y. Uozumi, T. Furuta, Y. Yamaguchi, H. Zen, T. Kii, H. Ohgaki, E. Velicheva, V. Kalinnikov, Z. Tsamalaidze, and P. Evtokhovitch, Journal of Nuclear Science and Technology, DOI: 10.1080/00223131.2023.2172087

Deformation of an electronic bunch caused by free-electron lasers
N. Sei, H. Zen, and H. Ohgaki, Physica Scripta, 98, 025510 (2023).

Electroretinograms from Crayfish Compound Eyes Evoked by Mid-Infrared Irradiation: Spectral Sensitivity Measurements of the Fast and Late Reactions

F. Shishikura, H. Zen, K. Hayakawa, Y. Komatsuzaki, Y. Hayakawa, T. Sakai, K. Nogami, Y. Takahashi, T. Tanaka,  T. Kii, and H. Ohgaki,  Journal of Nihon University Medical Association, 82, pp.35-42 (2023).