Electron acceleration up to MeV level under nonlinear interaction of subterawatt femtosecond laser chirped pulses with Kr clusters

Abstract

The acceleration of electrons to MeV energies from a Kr cluster jet irradiated by a relativistic (6 × 10 18 W cm −2 ) femtosecond laser pulse is studied. For the first time, the action of transform-limited laser pulse effects on the generation of hot electrons with an effective temperature (T hot ) of around 150 keV is experimentally demonstrated. The particles were accelerated in the plasma channel formed under self-focusing of the laser beam. Introducing a linear positive chirp together with pulse elongation from 50-~120 fs results in substantially enhanced hot electrons flux with a growth of T hot up to 300 keV and a maximal energy of over 2 MeV. The observed effect may be related to the strongly nonlinear propagation of the pulse through plasma, accompanied by more favorable conditions for efficient particles energy gain and pulse nonlinear compression.

Fusion neutrons from femtosecond relativistic laser-irradiated sub-micron aggregates in a rapid expanding jet of supercritical CO2 + CD3OD mixture

“…The jet of aggregates was exposed by tightly focused femtosecond Ti:sapphire laser system with a peak power of 1 TW (pulse energy, duration, and repetition rate of 50 mJ, 50 fs, and 10 Hz, respectively). The amplified spontaneous emission contrast was ∼10 8 over 100 ps before the main pulse [30]. Figure 5 shows a schematic of the experimental setup.…”

Generation and Application of X−ray Pulses on a Terawatt Laser System

“…Our activity in laser−plasma hard x−ray generation and particle acceleration includes: femtosecond laser system and infrastructure [1], electron acceleration in clusters with super intense chirped fs pulses [2], X−ray generation from remote atmospheric laser filament [3], broadband X−ray generation in clusters with relativistic fs laser pulses [4], efficient ultrashort X−rays production by fs laser in vacuum free regime [5]. We use three approaches to obtain X−ray pulses for time−resolved studies: DOI:10.54503/18291171-2022.15.2-3-35…”