EE 8390: Marc P. Christensen Associate Professor Electrical Engineering Department Southern Methodist University Dallas, TX (214) Fourier Optics Chapter 9: Holography

Holography 1948: Dennis Gabor – proposes lensless imaging: wavefront reconstruction. Calls it “total recording” or Holo gram Concept: record and recreate wavefront incident on “film”. –Amplitude & Phase How is that different than photography? How is it accomplished? –Inclusion of a reference wave, record the interference, capture the phase.

Typical Setup

Recorded Waves

Recording

Reconstruction

Reconstruction Diagram

What about image formation?

Image Formation Reconstruction

Gabor Hologram

Gabor Hologram Recording

Gabor Reconstruction

Leith-Upatniekes Hologram

Leith-Upatniekes Reconstruction

Holography of 3D Object

Interesting Aspects of Hologram Hologram is like a window. What happens if I break a hologram? What happens if I shrink / stretch a hologram?

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7 Today 89 Acousto Optics Holo Holo Review 2223 Review Last Class Exam Due 910 MTWRFS S Projects Presented Chapter 8 HW Due

Applications of Holography What does a Hologram do? How can we leverage this? Do we really know which is the reference and which is the object?

Microscopy

Interferometry – Multiple Exposure Holography What if we expose a holographic recording media multiple times? What would this reconstruct?

One Idea: What if we record only 2 holograms with extremely short and bright exposures? –Hologram #1 is just a diffuse background illumination. –Hologram #2 is captures a speeding bullet mid-flight. What happens when we re-create simultaneous background and bullet images?

Another Idea: Real time

Another Idea: Vibrating Surface

Imaging through distorting media

Holographic Storage