Frequency Domain Tomography Of Evolving Laser-Plasma Accelerator Structures
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Frequency Domain Holography (FDH), a technique for visualizing quasistatic objects propagating near the speed of light, has produced >snapshots> of laser wakefields,(1) but they are averaged over structural variations that occur during propagation through the plasma medium. Here we explore via simulations a generalization of FDH --- that we call Frequency Domain Tomography (FDT) --- that can potentially record a time sequence of quasistatic snapshots, like the frames of a movie, of the wake structure as it propagates through the plasma. FDT utilizes a several probe-reference pulse pairs that propagate obliquely to the drive pulse and wakefield, along with tomographic reconstruction algorithms similar to those used in medical CAT scans.