@article{oai:repo.qst.go.jp:00084609,
 author = {Hiromitsu, Kiriyama and Yasuhiro, Miyasaka and Akira, Kon and Mamiko, Nishiuchi and Akito, Sagisaka and Hajime, Sasao and Pirozhkov, Alexander and Yuuji, Fukuda and Koichi, Ogura and Kotaro, Kondo and Masaki, Kando and P. Nicholas, Dover and Hiromitsu, Kiriyama and Yasuhiro, Miyasaka and Akira, Kon and Mamiko, Nishiuchi and Akito, Sagisaka and Hajime, Sasao and Pirozhkov, Alexander and Yuji, Fukuda and Koichi, Ogura and Kotaro, Kondo and Masaki, Kando},
 journal = {High Power Laser Science and Engineering},
 month = {Dec},
 note = {We have experimentally improved the temporal contrast of the petawatt J-KAREN-P laser facility. We have investigated how the generation of pre-pulses by post-pulses changes due to the temporal overlap between the stretched pulse and the post-pulse in a chirped-pulse amplification system. We have shown that the time at which the pre-pulse by the post-pulse generates and its shape are related to the time difference between the stretched main-pulse and the post-pulse. With this investigation, we have found and identified the origins of the pre-pulses and have demonstrated removal of most pre-pulses by eliminating the post-pulse with wedged optics. We have also demonstrated the impact of stretcher optics on the picosecond pedestal. We have realized orders of magnitude enhancement of the pedestal by improving the optical quality of a key component in the stretcher.},
 title = {Enhancement of pre-pulse and picosecond pedestal contrast of the petawatt J-KAREN-P laser},
 volume = {9},
 year = {2021}
}