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1. Imaging by intensity interferometry of x-ray fluorescence at a compact x-ray free-electron laser

   https://doi.org/10.1103/PhysRevA.104.023514  

   Shevchuk, Andrew S.; Spence, John C.; Kirian, Richard A.; Graves, William S.; Schmidt, Kevin E. (August 2021, Physical Review A)

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2. Compact X-ray laser amplifier in the “Water Window”

   https://doi.org/10.1016/j.saa.2021.119675  

   Suckewer, S.; Sokolov, A.V.; Scully, M.O. (July 2021, Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy)

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3. Diffraction enhanced imaging utilizing a laser produced x-ray source

   https://doi.org/10.1063/5.0091348  

   Oliver, M.; Allen, C. H.; Divol, L.; Karmiol, Z.; Landen, O. L.; Ping, Y.; Wallace, R.; Schölmerich, M.; Theobald, W.; Döppner, T.; et al (September 2022, Review of Scientific Instruments)

   Image formation by Fresnel diffraction utilizes both absorption and phase-contrast to measure electron density profiles. The low spatial and spectral coherence requirements allow the technique to be performed with a laser-produced x-ray source coupled with a narrow slit. This makes it an excellent candidate for probing interfaces between materials at extreme conditions, which can only be generated at large-scale laser or pulsed power facilities. Here, we present the results from a proof-of-principle experiment demonstrating an effective ∼2 μm laser-generated source at the OMEGA Laser Facility. This was achieved using slits of 1 × 30  μm 2 and 2 × 40  μm 2 geometry, which were milled into 30 μm thick Ta plates. Combining these slits with a vanadium He-like 5.2 keV source created a 1D imaging system capable of micrometer-scale resolution. The principal obstacles to achieving an effective 1 μm source are the slit tilt and taper—where the use of a tapered slit is necessary to increase the alignment tolerance. We demonstrate an effective source size by imaging a 2 ± 0.2 μm radius tungsten wire. 

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4. Maximizing MeV x-ray dose in relativistic laser-solid interactions

   https://doi.org/10.1103/PhysRevResearch.5.L012044  

   Miller, Kyle G; Rusby, Dean R; Kemp, Andreas J; Wilks, Scott C; Mori, Warren B (March 2023, Physical Review Research)

   Bremsstrahlung x rays generated in laser-solid interactions can be used as light sources for high-energy-density science. We present electron and x-ray spectra from multidimensional kinetic simulations with varying laser pulse intensity and duration at fixed energy of 200J. A phenomenological model for the transition from superponderomotive to ponderomotive temperatures is described, yielding a temperature scaling that depends on pulse duration and density scale length. The shortest pulses create low-divergence electron beams before self-generated magnetic fields evolve, yielding 1–5−MeV forward-going x rays containing ∼0.5% of the laser energy. 

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5. 3D diffractive imaging of nanoparticle ensembles using an x-ray laser

   https://doi.org/10.1364/OPTICA.410851  

   Ayyer, Kartik; Xavier, P. Lourdu; Bielecki, Johan; Shen, Zhou; Daurer, Benedikt J.; Samanta, Amit K.; Awel, Salah; Bean, Richard; Barty, Anton; Bergemann, Martin; et al (January 2021, Optica)