Skip to main content
U.S. flag

An official website of the United States government

Official websites use .gov
A .gov website belongs to an official government organization in the United States.

Secure .gov websites use HTTPS
A lock ( ) or https:// means you’ve safely connected to the .gov website. Share sensitive information only on official, secure websites.

High-speed alignment optimization of digital optical phase conjugation systems based on autocovariance analysis in conjunction with orthonormal rectangular polynomials

Published

Author(s)

Ashton S. Hemphill, Yuecheng Shen, Jeeseong C. Hwang, Lihong V. Wang

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 2.5mm-1 while simultaneously improving focal quality, as quantified by the peak-to-background ratio, by several orders of magnitude over an unoptimized alignment.
Citation
Journal of Biomedical Optics
Volume
24
Issue
3

Keywords

digital phase conjugation, DOPC, time-reversal conjugation, spatial phase control, focusing through scattering medium, spatial light modulator, SLM, wavefront correction, auto covariance analysis

Citation

Hemphill, A. , Shen, Y. , Hwang, J. and Wang, L. (2018), High-speed alignment optimization of digital optical phase conjugation systems based on autocovariance analysis in conjunction with orthonormal rectangular polynomials, Journal of Biomedical Optics, [online], https://doi.org/10.1117/1.JBO.24.3.031004, https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=925673 (Accessed June 22, 2024)

Issues

If you have any questions about this publication or are having problems accessing it, please contact reflib@nist.gov.

Created August 27, 2018, Updated October 12, 2021