Author ORCID Identifier
https://orcid.org/0000-0001-6652-1755
Document Type
Theses, Ph.D
Disciplines
Optics
Abstract
Wavefront sensing is a vital technology that allows for recovery of information and image resolution, from otherwise corrupted signals. Combined with computational systems, wavefront sensors (WFS) enable rapid, accurate measurement of optical distortions, or aberrations. The analog holographic wavefront sensor (AHWFS) is a recent advancement that measures wavefront aberration modes using intensity ratios at paired diffraction spots. The modal AHWFS is an elegant solution to wavefront sensing that is low-cost, highly photon efficient, high speed, and insensitive to scintillation effects.
This work presents the first fabrication of an AHWFS in a self-developing acrylamide-based photopolymer for measuring defocus and spherical aberration. Much of the work towards development of the HWFS has come from the vast knowledge base surrounding adaptive optics (AO), wherein wavefront sensing is a key step. In general, the operating regime of the holograms used for wavefront sensing has not been at the forefront of these studies. Here, the fundamental diffraction behavior of thin and volume holographic gratings is examined in this context.
Finally, an experimental proof-of-concept of a zonal AHWFS, based on the angular selectivity of four crossed volume phase transmission holographic gratings, is presented.
DOI
https://doi.org/10.21427/r1qp-hs75
Recommended Citation
Branigan, Emma, "Novel Analog Holographic Wavefront Sensors in a Photopolymer Medium" (2024). Doctoral. 277.
https://arrow.tudublin.ie/sciendoc/277
Funder
Science Foundation Ireland
Creative Commons License
This work is licensed under a Creative Commons Attribution-NonCommercial-Share Alike 4.0 International License.
Publication Details
Submitted by Emma Branigan for the award of Phd, Technological University Dublin, School of Physics, Clinical & Optometric Sciences, September 2024.
doi:10.21427/r1qp-hs75