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Zhengyan Li, Rafal Zgadzaj , Xiaoming Wang, Chih-Hao Pai , Yen-Yu Chang, Michael C. Downer PowerPoint Presentation
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Zhengyan Li, Rafal Zgadzaj , Xiaoming Wang, Chih-Hao Pai , Yen-Yu Chang, Michael C. Downer - PowerPoint PPT Presentation


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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. ∆  probe (r,  ).

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slide1

Single-shot visualization of EVOLVING, light-speed index structures by multi-object phase contrast imaging

Zhengyan Li, RafalZgadzaj, Xiaoming Wang, Chih-HaoPai, Yen-Yu Chang, Michael C. Downer

Department of Physics, University of Texas at Austin, Austin, TX 78712

∆probe(r,)

aim of

this work

120 µm

0.4 ps

Snapshots of Quasi-static Wakes

Movies of Evolving Wakes Captured in a Single Shot...

1

N. H. Matliset al., Nature Phys. 2, 749 (2006)

slide2

800 nm, compressed 30 fs(?), < 1 mJ probe pulse, w0 < 1cm

The vacuum environment

L1 = ?

M2

1 deg. angle

35 cm interaction region?

M1

OP4

OP1

OP2

OP3

L0 = ?

Optical quality window?

  • 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?

Lens f = 75 cm

CCD1

CCD2

CCD3

CCD4

s pecs for moppci in facet
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