EE 8390:

Marc P. ChristensenAssociate ProfessorElectrical Engineering DepartmentSouthern Methodist UniversityDallas, TX 75275mpc@engr.smu.edu(214) 768-1407

Fourier OpticsChapter 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

Image Formation Reconstruction

Gabor Hologram

Gabor Hologram Recording

Gabor Reconstruction

Leith-Upatniekes Hologram

Leith-Upatniekes Reconstruction

Holography of 3D Object

Holography of 3D Object

Holography of 3D Object

http://www.youtube.com/watch?v=HqEwQuzcafI

http://amasci.com/amateur/holo1.html

http://www.youtube.com/watch?v=XUy8lELWhJg&feature=related

Interesting Aspects of Hologram• Hologram is like a window.

• What happens if I break a hologram?

• What happens if I shrink / stretch a hologram?

• http://portal.acm.org/citation.cfm?id=1288481

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Today

8 9AcoustoOptics

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Holo.

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Holo

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Review

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Review

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27 28Last Class

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4 5 6 7 8Exam Due

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M T W R F SS

Projects Presented

Chapter 8HW 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

http://www.isvr.soton.ac.uk/SPCG/Tutorial/Tutorial/Tutorial_files/Web-standing-guitar.htm

Imaging through distorting media

Imaging through distorting media

Holographic Storage

http://www.research.ibm.com/journal/rd/443/ashle4.gif