The role of transient plasma photonic structures in Raman amplification experiments (Conference Presentation)

Dino A. Jaroszynski

doi:10.1117/12.2672100

8 June 2023 The role of transient plasma photonic structures in Raman amplification experiments (Conference Presentation)

Dino A. Jaroszynski

Author Affiliations +

Proceedings Volume PC12579, Laser Acceleration of Electrons, Protons, and Ions VII; PC1257906 (2023) https://doi.org/10.1117/12.2672100
Event: SPIE Optics + Optoelectronics, 2023, Prague, Czech Republic

Abstract

High power lasers have become large because of they are based on low damage-threshold optical media. A more robust and compact medium for amplifying and manipulating intense laser pulses is plasma. Here we demonstrate that a few-millijoule, ultrashort seed pulses interacting with 3.5-J counter-propagating pump pulse in plasma can back-scattering nearly 100 mJ pump energy with high intrinsic eﬃciency, even when detuned away from the Raman resonance frequency. Scattering occurs oﬀ a plasma Bragg grating that is formed by ballistically evolving ions. Electrons bunched by the ponderomotive force of the beat-wave produce space-charge ﬁelds that impart phase correlated momenta to ions. Ions and electrons evolve into a volume Bragg grating that backscatters the pump pulse in the direction of the seed pulse. This, ultra-compact, two-step, inertial bunching mechanism can be used to manipulate and compress intense laser pulses. We also observe evidence of stimulated Compton (kinetic) and Raman backscattering. Experiments have been undertaken at the Central Laser Facility, Rutherford Appleton Laboratory using the Gemini laser.

Conference Presentation

Citation Download Citation

Dino A. Jaroszynski "The role of transient plasma photonic structures in Raman amplification experiments (Conference Presentation)", Proc. SPIE PC12579, Laser Acceleration of Electrons, Protons, and Ions VII, PC1257906 (8 June 2023); https://doi.org/10.1117/12.2672100

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