Abstract
Overview of the HiLASE project is reported. Development of high-power, picosecond laser sources is
desirable for industrial, scientifi c, and medical applications. The framework of the Research Program 1
(RP1) of the HiLASE project is to develop both the 500-mJ at 1-kHz repetition rate and the 5-mJ at
100-kHz repetition rate laser systems with 1‒2ps pulse duration based on thin disk technology. The
front-end of our laser system contains a regenerative amplifi er as the fi rst stage of amplifi er chain. We
are developing a high energy regenerative amplifi er and a high repetition rate regenerative amplifi er. The
average power of 50-W of the high repetition rate amplifi er has been achieved at the repetition rate of
100-kHz. Also, we have obtained the output energy of 45-mJ at the repetition rate of 1-kHz from the
high energy amplifi er. The measured M2 of amplifi ed beam was 1.2.
