Document Type
Conference Paper
Rights
Available under a Creative Commons Attribution Non-Commercial Share Alike 4.0 International Licence
Disciplines
1.3 PHYSICAL SCIENCES, Optics, 3.2 CLINICAL MEDICINE, Ophthalmology
Abstract
The fabrication of an analog holographic wavefront sensor, capable of detecting the low order defocus aberration, was achieved in an acrylamide-based photopolymer. While other implementations of holographic wavefront sensors have been carried out digitally, this process utilises a recording setup consisting only of conventional refractive elements so the cost and complexity of holographic optical element (HOE) production could be much reduced. A pair of diffraction spots, corresponding to a maximum and minimum amount of defocus, were spatially separated in the detector plane by multiplexing two HOEs with different carrier spatial frequencies. For each wavefront with a known aberration that was introduced during playback of the hologram, the resulting intensity ratio was measured in the expected pair of diffracted spots. A number of HOEs were produced with the diffraction efficiency of the multiplexed elements equalized, for a range of diffraction efficiency strengths, some as low as
DOI
https://doi.org/10.1117/12.2599912
Recommended Citation
Emma Branigan, Suzanne Martin, Matthew Sheehan, Kevin Murphy, "Direct multiplexing of low order aberration modes in a photopolymer-based holographic element for analog holographic wavefront sensing," Proc. SPIE 11860, Environmental Effects on Light Propagation and Adaptive Systems IV, 118600H (12 September 2021); doi: 10.1117/12.2599912
Funder
Science Foundation Ireland
Publication Details
Event: SPIE Remote Sensing 2021, Online Only