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We report initial observations of coherent optical transition radiationinterferometry (COTRI) patterns generated by microbunched electrons fromlaser-driven plasma accelerators (LPAs). These are revealed in the angulardistribution patterns obtained by a CCD camera with the optics focused atinfinity, or the far-field, viewing a Wartski two-foil interferometer. The beamdivergences deduced by comparison to results from an analytical model aresub-mrad, and they are smaller than the ensemble vertical beam divergencesmeasured at the downstream screen of the electron spectrometer. The transversesizes of the beamlet images were obtained with focus at the object, or nearfield, and were in the few-micron regime as reported by LaBerge et al. Theenhancements in intensity are significant relative to incoherent opticaltransition radiation (OTR) enabling multiple cameras to view each shot. Wepresent two-foil interferometry effects coherently enhanced in both the 100-TWLPA at 215 MeV energy at Helmholtz-Zentrum Dresden-Rossendorf and the PW LPA at1.0-GeV energy at the University of Texas-Austin. A transverse emittanceestimate is reported for a microbunched beamlet example generated within theplasma bubble.

Observations of Coherent Optical Transition Radiation Interference Fringes Generated by Laser Plasma Accelerator Electron Beamlets