Abstract
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.
Highlights
High-power laser systems are powerful instruments enabling a variety of applications in the fields of high energy density physics and relativistic laser plasma physics, with the prominent example of compact laser plasma accelerators [1,2,3]
We find a good accordance of the principle behavior and absolute values as in the work small values of the B-integral and small ratios of post- to main pulse, we find good agreements between by Didenko et al.; for small values of the B-integral and small ratios of post- to main pulse, we find numerical model and analytical equation
From the calculated values for the retrieved energy per pass through the active medium, we directly evaluate the B-integral assuming a temporal pulse length of 600 ps according to stretching rate and bandwidth
Summary
High-power laser systems are powerful instruments enabling a variety of applications in the fields of high energy density physics and relativistic laser plasma physics, with the prominent example of compact laser plasma accelerators [1,2,3]. 10 MeV energies requires full control over interaction conditions and excellent temporal pulse contrast [4,5,6,7,8,9,10]. Post-pulses are inevitably generated when the laser pulse passes through transparent elements of the laser amplification chain, such as amplifier crystals, Pockels cells, or wave plates. As these elements are antireflection treated, typically with reflectivities of less than 0.5%, post-pulses are generated on a 10−5 level or below.
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
