Super-ashura KrF laser programme at ETL

摘要

In the Super-ASHURA KrF laser at the Electrotechnical Laboratories, the main amplifier with full pumping duration (270 ns) and 12 optical beam lines has been completed. At present, the main amplifier can generate 3.7 kJ output energy with full aperture, and a total output energy of 2.7 kJ has been demonstrated with 12 beams (20 ns x 12) double pass amplification. For irradiation smoothing, a two dimensional smoothing effect has been demonstrated by combining one dimensional broadband a two dimensional smoothing effect has been demonstrated by combining one dimensional broadband random phase irradiation and angular dispersion. In the Raman amplification, which is to be used for pulse shaping, short Stokes pulses (67 ps, 2 ns) have been stably generated in mixed gas, and a power conversion efficiency of 73 percent has been demonstrated in the double pass amplifier. The two dimensional target acceleration profile has been measured by using short (< 100 ps) 268 nm probe pulses.