Dual-energy electron beams from a compact laser-driven accelerator
Nature Photonics, 13, 263–269 (2019)
Abstract:
Ultrafast pump–probe experiments open the possibility to track fundamental material behaviour, such as changes in electronic configuration, in real time. To date, most of these experiments are performed using an electron or a high-energy photon beam that is synchronized to an infrared laser pulse. Entirely new opportunities can be explored if not only a single, but multiple synchronized, ultrashort, high-energy beams are used. However, this requires advanced radiation sources that are capable of producing dual-energy electron beams, for example. Here, we demonstrate simultaneous generation of twin-electron beams from a single compact laser wakefield accelerator. The energy of each beam can be individually adjusted over a wide range and our analysis shows that the bunch lengths and their delay inherently amount to femtoseconds. Our proof-of-concept results demonstrate an elegant way to perform multi-beam experiments in the future on a laboratory scale.
Burst behavior due to the quasimode excited by stimulated Brillouin scattering in high-intensity laser–plasma interactions
High Power Laser Science and Engineering Cambridge University Press (CUP) 7 (2019) e58
Single-shot frequency-resolved optical gating for retrieving the pulse shape of high energy picosecond pulses
Review of Scientific Instruments AIP Publishing 89:10 (2018) 103509
Abstract:
Accurate characterization of laser pulses used in experiments is a crucial step to the analysis of their results. In this paper, a novel single-shot frequency-resolved optical gating (FROG) device is described, one that incorporates a dispersive element which allows it to fully characterize pulses up to 25 ps in duration with a 65 fs per pixel temporal resolution. A newly developed phase retrieval routine based on memetic algorithms is implemented and shown to circumvent the stagnation problem that often occurs with traditional FROG analysis programs when they encounter a local minimum.Anti-Langmuir decay instability in Langmuir decay instability cascade
Physics of Plasmas AIP Publishing 25:9 (2018) 092112
Advantages to a diverging Raman amplifier
Communications Physics Nature Publishing Group 1 (2018) 19