A.Williams: Objectives and Literature Review
Contents
Objectives and Literature Review
Programmable spatial light modulators (PSLM’s) are two-dimensional electrically addressable devices that function as reusable transparencies on which spatially varying amplitude or phase patterns can be written electronically, often with an output signal from a computer. In practice, there is cross coupling between the amplitude and phase modulation of such devices so that the modulation is really complex, although it is possible to operate them in a phase-mostly or amplitude-mostly mode.
The PSLM, we have in lab(courtesy of Justin) can only modulate phase. This presents some advantages such as:
- Better diffraction efficiency
- Possible to eliminate the zeroth order beam (i.e. the undiffracted beam which allows for the possibility for all of the optical power to be used for constructing your object of interest.
Explanation: The diffraction efficiency of phase holograms is better than that of amplitude holograms. Why?
They are extremely useful devices that can be used as either amplitude or phase modulators for signal processing, wavefront sensing, wavefront correction, wavefront manipulation and many other applications in imaging and nonimaging optical systems. SLM
Feasibility
"Alice laughed: "There's no use trying," she said; "one can't believe impossible things." "I daresay you haven't had much practice," said the Queen. "When I was younger, I always did it for half an hour a day. Why, sometimes I've believed as many as six impossible things before breakfast." Alice in Wonderland." Although that isn't exactly my attitude, I think my project the diffraction efficiency
Novel?
Yes because I have never done any of these things before but I am very excited.
Hopeful Accomplishments
Personally:
- Mathematical optics
- Fourier Optics
- Hologram Algorithms
- Resolution and Calibration of SLM
- Optical Systems
- Interface optical theory, programming and electronics
- From theory to microscope: building a microscopes to test performance of the holograms I write for the SLM
- More about diffraction,fourier transforms, lens systems
- SLM:The Beginnings
- MiniProject-a1
- Calibration, pixels, crystals, diffraction to gray scale imaging
- Learn about algorithms for holography + set up weekly meetings with someone who can explain concepts I get stuck on
- Write script for simple lens
- Test script for simple lens and then perform mini experiment using a modified version of Young's double split experiment(miniprojectA).
- MiniProject-b: Optical Filtering
- MiniProject-c: Optical Filtering
- MiniProject-d: Optical Filtering
- MiniProject-e: Optical Filtering
- FinalMiniProject-a2: Optical Filtering
Goals/Steps: Things that can be graded
I divided the project up into mini-projects because ..... and also because I think have smaller sections of a project due each two weeks will help me stay on track. As of now my final good ( or test of knowledge will be designing a .... optical trap) and then measuring the optical properties of the bessel beam I create. I saved this part of the project for last because even though it is not hard I think it is a good and if I succeed in all of the successor mini-projects I should be in good shape to build the - give myself 3weeks. 1.5 weeks for each miniproject although some of the projects should take less than that and that will give me 1.5 build and test the optical trap with two bessel beams. My goal is to be that time be familiar enough with matlab and bessel beams and holography algorithms, calibrations that should take less than 3 days. </p>
Final Project Proposal
Ajoke Williams - Final Project Proposal March 9. Preview: Words about what the above says as always.
