Upload
gwendoline-waters
View
219
Download
0
Tags:
Embed Size (px)
Citation preview
EE 8390:
Marc P. ChristensenAssociate ProfessorElectrical Engineering DepartmentSouthern Methodist UniversityDallas, TX [email protected](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
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
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