Speaker
Description
Spatio-temporal couplings (STCs) [1] can have a detrimental effect on the intensity at focus of ultrashort femtosecond lasers. The laser spatio-temporal intensity profile control is a key issue for stable operation of laser wakefield acceleration (LWFA) [2]. Thus, it is necessary to measure and correct STCs. Techniques such as INSIGHT [3] or TERMITES [4] allow reconstructing the full spatial phase for different spectral components of the laser pulse using a phase-retrieval iterative algorithm. However this requires a computing time of the order of several minutes, making it inappropriate for single-shot online monitoring of lasers running at repetition rates of several hertz. We propose a method to characterize STCs in real-time using a multispectral camera [5] coupled with wavefront and temporal measurements and a machine learning algorithm. We will present the sensitivity characterization of the STCs measurement, which has been tested at 10 Hz for the optimization of a large optical compressor. Finally, we will discuss the status of the reinforcement learning implementation for full laser field reconstruction.
Funding Agency
ANR/PIA3-PACIFICS, CNRS/IN2P3, Université Paris Saclay
Footnotes
[1] Jolly et al., J. Opt. 22 103501 (2020)
[2] Mittelberger et al., P. REV. E 100, 063208 (2019)
[3] Borot et al., O. Express 26 26444–61 (2018)
[4] Pariente et al., N. Photon. 10 547–53 (2016)
[5] Dorrer et al., O. Express Vol. 26, No. 25 (2018)
| I have read and accept the Privacy Policy Statement | Yes |
|---|
