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28 August 2018 High-speed alignment optimization of digital optical phase conjugation systems based on autocovariance analysis in conjunction with orthonormal rectangular polynomials
Ashton S. Hemphill, Yuecheng Shen, Jeeseong Hwang, Lihong V. Wang
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Journal of Biomedical Optics, Vol. 24, Issue 3, 031004 (August 2018). https://doi.org/10.1117/1.JBO.24.3.031004
Abstract
Digital optical phase conjugation (DOPC) enables many optical applications by permitting focusing of light through scattering media. However, DOPC systems require precise alignment of all optical components, particularly of the spatial light modulator (SLM) and camera, in order to accurately record the wavefront and perform playback through the use of time-reversal symmetry. We present a digital compensation technique to optimize the alignment of the SLM in five degrees of freedom, permitting focusing through thick scattering media with a thickness of 5 mm and transport scattering coefficient of 2.5  mm  −  1 while simultaneously improving focal quality, as quantified by the peak-to-background ratio, by several orders of magnitude over an unoptimized alignment.
CC BY: © The Authors. Published by SPIE under a Creative Commons Attribution 4.0 Unported License. Distribution or reproduction of this work in whole or in part requires full attribution of the original publication, including its DOI.
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Ashton S. Hemphill, Yuecheng Shen, Jeeseong Hwang, and Lihong V. Wang "High-speed alignment optimization of digital optical phase conjugation systems based on autocovariance analysis in conjunction with orthonormal rectangular polynomials," Journal of Biomedical Optics 24(3), 031004 (28 August 2018). https://doi.org/10.1117/1.JBO.24.3.031004
Received: 23 April 2018; Accepted: 6 August 2018; Published: 28 August 2018
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Cited by 11 scholarly publications.
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KEYWORDS
Spatial light modulators
Cameras
Scattering
Optical alignment
Phase conjugation
Light scattering
Mirrors
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