ee 8390: marc p. christensen associate professor electrical engineering department southern...
TRANSCRIPT
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EE 8390:
Marc P. ChristensenAssociate ProfessorElectrical Engineering DepartmentSouthern Methodist UniversityDallas, TX [email protected](214) 768-1407
Fourier OpticsChapter 9: Holography
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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.
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Typical Setup
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Recorded Waves
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Recording
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Reconstruction
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Reconstruction Diagram
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What about image formation?
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Image Formation Reconstruction
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Image Formation Reconstruction
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Gabor Hologram
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Gabor Hologram Recording
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Gabor Reconstruction
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Leith-Upatniekes Hologram
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Leith-Upatniekes Reconstruction
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Holography of 3D Object
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Holography of 3D Object
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Holography of 3D Object
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http://www.youtube.com/watch?v=HqEwQuzcafI
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http://amasci.com/amateur/holo1.html
http://www.youtube.com/watch?v=XUy8lELWhJg&feature=related
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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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• http://portal.acm.org/citation.cfm?id=1288481
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7
Today
8 9AcoustoOptics
10 11 12
13 14
Holo.
15 16
Holo
17 18 19
20 21
Review
22 23
Review
24 25 26
27 28Last Class
29 30 1 2 3
4 5 6 7 8Exam Due
9 10
M T W R F SS
Projects Presented
Chapter 8HW Due
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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?
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Microscopy
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Interferometry – Multiple Exposure Holography
• What if we expose a holographic recording media multiple times?
• What would this reconstruct?
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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?
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Another Idea: Real time
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Another Idea: Vibrating Surface
http://www.isvr.soton.ac.uk/SPCG/Tutorial/Tutorial/Tutorial_files/Web-standing-guitar.htm
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Imaging through distorting media
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Imaging through distorting media
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Holographic Storage
http://www.research.ibm.com/journal/rd/443/ashle4.gif