Stark Laser-Plasma Physics
Research
Plasma optics and relativistic transparency
At high intensities, a plasma can reshape the laser pulse that drives it. We investigate self-focusing, the influence of ion motion, and relativistic transparency: the ability of intense light to propagate through plasma that would otherwise be opaque. By studying how temperature, particle motion, and polarization affect propagation, we explore plasma-based optical elements for focusing and controlling powerful laser pulses.
Laser-driven particle acceleration
Intense laser pulses can generate electric fields that accelerate ions over very short distances. We study the mechanisms that transfer laser energy to particles, including processes associated with relativistic transparency. Our work examines how target geometry and composition affect proton-beam energy, divergence, and energy spread, with the aim of improving beam control and informing concepts for proton fast ignition.
Laser-plasma interactions in fusion
In inertial confinement fusion, plasma waves and instabilities can redirect laser energy and change how energy reaches the target. We investigate stimulated Raman scattering, stimulated Brillouin scattering, and cross-beam energy transfer using kinetic simulations and reduced models. Our broader research experience also includes radiation-hydrodynamic modeling of target expansion and double-shell implosions, connecting detailed plasma physics with the design and interpretation of fusion experiments.
Magnetic fields and high-energy radiation
Laser-driven electron currents can produce intense magnetic fields and energetic radiation. We investigate how structured targets, including cone-channel geometries and hollow microcapsules, shape these currents and the resulting emission. Our goals include understanding magnetic-field generation and controlling the yield and angular distribution of gamma rays produced in laser-plasma interactions.