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Experimental investigation on the temporal contrast of pre-pulses by post-pulses in a petawatt laser facility

Authors :
Mamiko Nishiuchi
Yasuhiro Miyasaka
Alexander S. Pirozhkov
Koichi Ogura
Masaki Kando
Yuji Fukuda
Hiromitsu Kiriyama
Kiminori Kondo
Akito Sagisaka
Source :
Optics letters. 45(5)
Publication Year :
2020

Abstract

We experimentally explore the generation of pre-pulses by post-pulses, created through internal reflection in the optical components, by the nonlinear process associated with the B-integral in the laser chain of the petawatt (PW) facility J-KAREN-P. At a large time delay between the main and the post-pulses, we have found that the pre-pulses are not generated from their counterpart post-pulses at an identical time difference before the main pulse, and the temporal shapes of the pre-pulses are greatly distorted asymmetrically. We have also observed that the peak intensities of the pre-pulses are drastically suppressed compared to the expected value at a small time delay. We briefly describe the origins of the pre-pulses generated by the post-pulses and demonstrate the removal of the pre-pulses by switching to optical components with a small wedge angle at our PW laser facility.

Details

ISSN :
15394794
Volume :
45
Issue :
5
Database :
OpenAIRE
Journal :
Optics letters
Accession number :
edsair.doi.dedup.....12a451742ef9d0dc4545c2af7d7a95ed