● “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