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. doi:10.1364/OL.41.001321. https://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 | ||||||||||||
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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). | ||||||||||||
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Issue or Number: | 7 | ||||||||||||
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 | ||||||||||||
DOI: | 10.1364/OL.41.001321 | ||||||||||||
Record Number: | CaltechAUTHORS:20160712-102112883 | ||||||||||||
Persistent URL: | https://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: | 11 Nov 2021 04:07 |
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