iTeox, 14 avenue Jean Jaurès, 91940 Gometz-le-chatel, France
Akira Kon
Kansai Photon Science Institute (KPSI), National Institutes for Quantum and Radiological Science and Technology, 8-1-7 Umemidai, Kizugawa, Kyoto 610-0215, Japan
Mamiko Nishuishi
Kansai Photon Science Institute (KPSI), National Institutes for Quantum and Radiological Science and Technology, 8-1-7 Umemidai, Kizugawa, Kyoto 610-0215, Japan
Hiromitsu Kiriyama
Kansai Photon Science Institute (KPSI), National Institutes for Quantum and Radiological Science and Technology, 8-1-7 Umemidai, Kizugawa, Kyoto 610-0215, Japan
Kiminori Kondo
Kansai Photon Science Institute (KPSI), National Institutes for Quantum and Radiological Science and Technology, 8-1-7 Umemidai, Kizugawa, Kyoto 610-0215, Japan
We report on a new approach to measure the accumulated B-integral in the regenerative and multipass amplifier stages of ultrashort-pulse high-power laser systems by B-integral-induced coupling between delayed test post-pulses and the main pulse. A numerical model for such non-linear pulse coupling is presented and compared to data taken at the high-power laser Draco with self-referenced spectral interferometry (SRSI). The dependence of the B-integral accumulated in the regenerative amplifier on its operation mode enables optimization strategies for extracted energy vs. collected B-integral. The technique presented here can, in principle, be applied to characterize any type of ultrashort pulse laser system and is essential for pre-pulse reduction.
