holography presentation
DESCRIPTION
Presentation covering the topic of actual holographic optical phenomenaTRANSCRIPT
● “Lensless Photography”● 3-Dimensional Images
with Depth and Parallax● Two main types of
holograms:o Transmissiveo Reflective
What is a Holograph?
● Stage “Holograph”● This does not
produce an image with depth or parallax, so it’s not an actual hologram
● Effective because crowd is far away
Not Holographs
● 2 Types of Interference:o Constructiveo Destructive
● Interference Patterns (Fringes)
● Beam Coherence (Monochromaticity)
Interferometry Review
We are glad you asked!
So how do you make a Hologram?
Hologram:
Holograms vs. Holographs
Holograph:
Reconstructing the Holograph
Hologram Reconstruction
Fresnel Zone Plate
Off-axis Holograms
● Every pixel of the Holographic Film contains the Entire Image
● Fragmentation of the Film Gives us a Limited Perspective
Fragmentation
Small portion of the Hologram
Large Portion of the Hologram
● Transmission Holograms Only
● Made with a Single Wavelength
● Direct Proportionality
Wavelength Scaling
Mercury Source Projecting Holograph of a Pipe
Reflection● Source on same side as
viewer● White light (Bragg
Reflector)● Single Reconstructed
Holograph (Not Scalable)
Reflection vs. Transmission
Transmission ● Source on opposite side
of viewer● Only uses
Monochromatic light● Infinite Reconstruction
Wavelengths (Scalable)
● A type of Transmission Hologram ● Plugs points into an algorithm to generate
hologram ● Potential Problems
o Run time of program o Resolution is poor
Computer Generated Hologram
Images from ryan’s matlab code and an explanation of why it works
Ryan’s matlab Code
● Data Storage● Entertainment● Communication● Sub-Micron Imaging
Applications
● A useful feature for data storage with holograms is the redundancy.
● We need a medium that can be erased and rewritten quickly
● Plausible, but optical standards are not up to the standards demanded by computers today
Data Storage
● Applicationso Holographic Television o Holographic Phone
Entertainment/Communication
● Makes Use of Scaling Property
● Make Hologram with High Energy Beam (UV, X-Ray)
● Reconstruct with Low Energy Visible Beam (Red)
Sub-Micron Imaging
● Image Sub-Micron Objects with 3-D and in an Easier Way than SEM type Imaging
● Difficult to Operate in Real-Time
Images and References