Yasuaki Okano

TL;DR: In this article, the dependence on laser intensity and pulse duration in energetic proton acceleration by irradiation of ultrashort laser pulses on a 5μm thick copper tape target was measured.

TL;DR: A thin tape target driver for laser ion acceleration was developed in this paper, which can move a copper tape of 5 μm thickness with a positioning reproducibility of less than 30 μm (peak to valley), which is sufficient for a laser irradiation target.

TL;DR: In this paper, the Boltzmann temperature of the proton was 185 keV which was less than the ponderomotive potential (650 keV) of an electromagnetic standing wave in a laser field.

TL;DR: In this article, the energy spectra of fast electrons produced by ultrashort, high-intensity laser pulses were directly measured using a magnetic spectrometer with an imaging plate, and the typical temperature was 350 keV for irradiation on 30 μm thick copper film by pulses of width 43 fs, intensity 2.7×1018 W/cm2, repetition rate 10 Hz without artificial prepulses and was found to be close to the ponderomotive potential.

TL;DR: In this article, the dynamics of the laser ablation plume expansion of aluminum was investigated by using space-and time-resolved soft x-ray absorption spectroscopy, which was generated by irradiating an aluminum target with 120fs near-infrared pulses at an intensity of 1014W∕cm2.