Imaging Components, Systems, and Processing

Focusing of light through turbid media by curve fitting optimization

[+] Author Affiliations
Changmei Gong, Tengfei Wu, Jietao Liu, Huijuan Li, Xiaopeng Shao, Jianqi Zhang

Xidian University, School of Physics and Optoelectronic Engineering, No. 2 South Taibai Road, Xi’an, Shaanxi 710071, China

Opt. Eng. 55(12), 123105 (Dec 10, 2016). doi:10.1117/1.OE.55.12.123105
History: Received August 17, 2016; Accepted November 15, 2016
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Abstract.  The construction of wavefront phase plays a critical role in focusing light through turbid media. We introduce the curve fitting algorithm (CFA) into the feedback control procedure for wavefront optimization. Unlike the existing continuous sequential algorithm (CSA), the CFA locates the optimal phase by fitting a curve to the measured signals. Simulation results show that, similar to the genetic algorithm (GA), the proposed CFA technique is far less susceptible to the experimental noise than the CSA. Furthermore, only three measurements of feedback signals are enough for CFA to fit the optimal phase while obtaining a higher focal intensity than the CSA and the GA, dramatically shortening the optimization time by a factor of 3 compared with the CSA and the GA. The proposed CFA approach can be applied to enhance the focus intensity and boost the focusing speed in the fields of biological imaging, particle trapping, laser therapy, and so on, and might help to focus light through dynamic turbid media.

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© 2016 Society of Photo-Optical Instrumentation Engineers

Citation

Changmei Gong ; Tengfei Wu ; Jietao Liu ; Huijuan Li ; Xiaopeng Shao, et al.
"Focusing of light through turbid media by curve fitting optimization", Opt. Eng. 55(12), 123105 (Dec 10, 2016). ; http://dx.doi.org/10.1117/1.OE.55.12.123105


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