University of Tokyo, Tokyo, Japan
The University of Tokyo, Nuclear Professional School, Ibaraki-ken, Japan
KEK, Ibaraki, Japan
Passively mode-locked Yb lasers can easily generate femtosecond pulse at high repetition rate. The Yb lasers also have a property of high efficiency, which enables us to obtain high power laser. Because of these characteristics, the Yb lasers have been applied to many fields such as optical frequency comb and X-ray generation. Now, femtosecond pulse of much higher energy at high repetition rate is being required for dielectric laser accelerator (DLA) and lasertron. We have developed high power mode-locked Yb laser, and achieved 20W mode-locked Yb fiber laser amplification system at repetition rate of 62MHz. At the conference, our latest results will be reported.
