Single-shot visualization of EVOLVING, light-speed index structures by multi-object phase contrast imaging Zhengyan Li, Rafal Zgadzaj, Xiaoming Wang, Chih-Hao Pai, Yen-Yu Chang, Michael C. Downer Department of Physics, University of Texas at Austin, Austin, TX 78712 Snapshots of Quasi-static Wakes Movies of Evolving Wakes Captured in a Single Shot... 120 µm 0.4 ps ∆probe(r,) aim of this work N. H. Matlis et al., Nature Phys. 2, 749 (2006) 1

The vacuum environment 35 cm interaction region? 1 deg. angle L1 = ? The vacuum environment Optical quality window? CCD1 CCD2 CCD3 CCD4 L0 = ? 800 nm, compressed 30 fs(?), < 1 mJ probe pulse, w0 < 1cm M1 M2 Lens f = 75 cm OP1 OP2 OP3 OP4 What we want to do with index structure n(ζ,x,z)… Multi-Object-Plane imaging, each object plane (OP) are imaged to different CCD. Phase shift imprinted on probe at arbitrary z, not limited to OPs, is reconstructed. In single shot, z-depending transverse profile at specific ζ is obtained. With multi-shots, full visualization of index object n(ζ,x,z). Questions: Is the interaction length 35 cm, or longer? Where is possible for us to couple laser into the chamber? What are the lengths of L0 and L1? To maintain a good imaging resolution, we hope L1 is not too large, what is the shortest length we can get? Is there anything that potentially blocks or clips the beam between M1 and M2? Here the angle is 1 deg. = 0.0175 rad, so the inside diameter of the tube containing the laser has to be larger than 3 cm, if L0, L1 ~ 50 cm. Is it OK?

These are what we expected to observe with 6 cameras

Specs for MOPPCI in FACET The minimum angle for oblique angle geometry θmin = λ/πσ = 0.146 deg @ σ = 100 um 0.72 deg @ σ = 20 um Temporal walk-off Δt = Lθ2/2c = 38 fs @ θ = 0.5 deg 152 fs @ θ = 1 deg z-resolution for evolving bubble δz = σ/θ = 5.73 mm @ σ = 100 um, θ = 1 deg 11.4 mm @ σ = 100 um, θ = 0.5 deg 2.29 mm @ σ = 20 um, θ = 0.5 deg ζ-resolution and range for non-evolving bubble δζ = max{σ(θ/2+φ)/c, tpr} = max{50, 30} = 50 fs Δζ = Lθ(θ/2+φ)/c = 1.26 ps @ σ = 100 um, θ = 0.5 deg, φ = 8 deg