Akash Kota Kota
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Digital holography (DH) has many applications in science and engineering, especially in the recreation and display of 3D images of objects. DH is able to reconstruct the three-dimensional surface by processing holographic data recorded on a charge coupled device (CCD). Holographic data can also be recorded in a photorefractive (PR) material. In fact, dynamic real-time holographic interferometry (RHI) can be implemented by using PR materials. To implement RHI using PR materials, two beams, one called a pump and one called the object beam are introduced onto a PR material to write the hologram of the object. During the hologram writing process, these beams can couple in intensity and/or phase which thereafter are responsible for self-diffraction of these incident beams, and can also give rise to Bragg and non-Bragg orders. In this work, the exact solutions to the interaction equations of Bragg and non-Bragg orders in a PR material for the case of interacting angular spectra are obtained by numerically solving them in MATLAB©. An iron doped lithium niobate crystal is used as an example of a PR material and an incident wavelength of 514 nm is assumed. Experimentally, it has been observed that when the angle between the two incident beams is small, typically a few degrees, multiple non-Bragg orders are generated. For numerical simulations, only the interactions between the spectra of two incident optical beams (Bragg orders) and two non-Bragg orders are considered. Different beam profiles such as Gaussian and flat-tops are considered as incident beams and the spatial evolution of both Bragg and non-Bragg orders as well as their relative phase shifts are numerically obtained.
Partha P. Banerjee
Primary Advisor's Department
Electro-Optics Graduate Program
Stander Symposium poster
"Dynamic Holography using Photorefractive Materials: Applications to 3D Visualization and Image Processing" (2016). Stander Symposium Projects. 831.