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Bit-efficient, sub-millisecond wavefront measurement using a lock-in camera for time-reversal based optical focusing inside scattering media

Liu, Yan and Ma, Cheng and Shen, Yuecheng and Wang, Lihong V. (2016) Bit-efficient, sub-millisecond wavefront measurement using a lock-in camera for time-reversal based optical focusing inside scattering media. Optics Letters, 41 (7). pp. 1321-1324. ISSN 0146-9592. PMCID PMC4874255. http://resolver.caltech.edu/CaltechAUTHORS:20160712-102112883

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Abstract

Time-reversed ultrasonically encoded optical focusing measures the wavefront of ultrasonically tagged light, and then phase conjugates the tagged light back to the ultrasonic focus, thus focusing light deep inside the scattering media. In previous works, the speed of wavefront measurement was limited by the low frame rates of conventional cameras. In addition, these cameras used most of their bits to represent an informationless background when the signal-to-background ratio was low, resulting in extremely low efficiencies in the use of bits. Here, using a lock-in camera, we increase the bit efficiency and reduce the data transfer load by digitizing only the signal after rejecting the background. With this camera, we obtained the wavefront of ultrasonically tagged light after a single frame of measurement taken within 0.3 ms, and focused light in between two diffusers. The phase sensitivity has reached 0.51 rad even when the SBR is 6×10^(−4).


Item Type:Article
Related URLs:
URLURL TypeDescription
http://dx.doi.org/10.1364/OL.41.001321DOIArticle
https://www.osapublishing.org/ol/abstract.cfm?uri=ol-41-7-1321PublisherArticle
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC4874255PubMed CentralArticle
ORCID:
AuthorORCID
Shen, Yuecheng0000-0003-1990-8142
Wang, Lihong V.0000-0001-9783-4383
Additional Information:© 2016 Optical Society of America. Received 13 October 2015; revised 25 January 2016; accepted 8 February 2016; posted 10 February 2016 (Doc. ID 251850); published 16 March 2016. Funding: National Institutes of Health (NIH) (DP1 EB016986, R01 CA186567).
Funders:
Funding AgencyGrant Number
NIHDP1 EB016986
NIHR01 CA186567
Classification Code:OCIS codes: (110.0113) Imaging through turbid media; (170.7050) Turbid media; (110.1080) Active or adaptive optics; (070.5040) Phase conjugation; (120.5050) Phase measurement
PubMed Central ID:PMC4874255
Record Number:CaltechAUTHORS:20160712-102112883
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:20160712-102112883
Official Citation:Yan Liu, Cheng Ma, Yuecheng Shen, and Lihong V. Wang, "Bit-efficient, sub-millisecond wavefront measurement using a lock-in camera for time-reversal based optical focusing inside scattering media," Opt. Lett. 41, 1321-1324 (2016)
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:68977
Collection:CaltechAUTHORS
Deposited By: Tony Diaz
Deposited On:27 Jul 2016 18:55
Last Modified:21 Nov 2017 00:38

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