Beam characterization of mid-infrared free electron laser to drive high-harmonic generation
K. Kawase, H. Zen, T. Sakai, Y. Hayakawa, H. Ohgaki, and R. Hajima, Japanese Journal of Applied Physics, 63, 072001 (2024).

Breakdown of argon by a train of high-repetition long-wave-infrared pulses from a free-electron laser oscillator

R. Hajima, K. Kawase, J.K. Koga, H. Zen, and H. Ohgaki,  Optics Express, 32, pp. 22722-22737 (2024).

Molphological study of depth-controlled high quality holes and lines fabricated on a metal substrate with a thin metal film by picosecond laser pulses
K. Sota, K. Ando, H. Zen, T. Kii, H. Ohgaki, and T. Nakajima, Optics & Laser Technology, 175, 110853 (2024).

Carrier-envelope phase stabilization in FEL oscillators
R. Hajima, K. Kawase, H. Zen, and H. Ohgaki, Journal of Physics: Conference Series, 2687, 032013 (2024).

Infrared free electron laser-irradiated polyleucine does not exert aggregates-induced aversive effects on mouse brain
A. Mori, T. Shiroishi, J. Fujioka, T. Nakajima, S. Mitsui, H. Suginoma, Y. Kakuta, H. Zen, and K. Nakamura, Brain Disorders, 14, 100137 (2024).