Speaker
Description
High-Harmonic Generation (HHG) from laser-solid interactions is a process whereby harmonics of the incident driving pulse are generated; a phenomenon which is paving the way to the generation of attosecond pulses and the emission of coherent extreme ultraviolet (XUV) and soft X-ray radiation. Chirped harmonics can be produced by varying the chirp of the driving beam as shown by simulations using the Smilei PIC code. Chirped pulses allow the bridge between Snapshot Hyperspectral Imaging (SHI) and Video Compressive Sensing (VCS) to be made, and hyperspectral images can then be converted into videos with extremely high temporal resolution. This motivated the design of the Low-Order Boosted Spatio-Temporal Encoder of Radiation (LOBSTER) which was optimised, through ray-tracing, for the capture of high spectral and spatial resolution images of low-order harmonics from laser-solid interactions and the study of the effects of a chirped driving beam on the interaction. This setup was used in an experiment at GEMINI TA3 in November 2024 where hyperspectral imaging of low-order chirped harmonics was carried out. I present the design of a SHI setup, the reconstruction method as well as results from the experiment.
