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Compressive sensing optical coherence tomography using randomly accessible lasers

Harfouche, Mark and Satyan, Naresh and Vasilyev, Arseny and Yariv, Amnon (2014) Compressive sensing optical coherence tomography using randomly accessible lasers. In: Compressive Sensing III. Proceedings of SPIE. No.9109. Society of Photo-optical Instrumentation Engineers , Bellingham, WA, Art. No. 91090L. ISBN 9781628410464.

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We propose and demonstrate a novel a compressive sensing swept source optical coherence tomography (SSOCT) system that enables high speed images to be taken while maintaining the high resolution offered from a large bandwidth sweep. Conventional SSOCT systems sweep the optical frequency of a laser ω(t) to determine the depth of the reflectors at a given lateral location. A scatterer located at delay τ appears as a sinusoid cos (ω(t)τ ) at the photodetector. The finite optical chirp rate and the speed of analog to digital and digital to analog converters limit the acquisition rate of an axial scan. The proposed acquisition modality enables much faster image acquisition rates by interrogating the beat signal at randomly selected optical frequencies while preserving resolution and depth of field. The system utilizes a randomly accessible laser, a modulated grating Y-branch laser, to sample the interference pattern from a scene at randomly selected optical frequencies over an optical bandwidth of 5 THz , corresponding to a resolution of 30 μm in air. The depth profile is then reconstructed using an l_1 minimization algorithm with a LASSO constraint. Signal-dependent noise sources, shot noise and phase noise, are analyzed and taken into consideration during the recovery. Redundant dictionaries are used to improve the reconstruction of the depth profile. A compression by a factor of 10 for sparse targets up to a depth of 15 mm in noisy environments is shown.

Item Type:Book Section
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Harfouche, Mark0000-0002-4657-4603
Additional Information:© 2014 SPIE. The authors would like to thank John J. Bruer and Roarke Horstmeyer for their insightful discussions. This work was supported in part by the Defense Advanced Research Projects Agency (DARPA) Knowledge Enhanced Compressive Measurements program (KECoM).
Funding AgencyGrant Number
Defense Advanced Research Projects Agency (DARPA)UNSPECIFIED
Subject Keywords:optical coherence tomography, random access laser, compressive sensing, LASSO, swept source
Series Name:Proceedings of SPIE
Issue or Number:9109
Record Number:CaltechAUTHORS:20141222-084452588
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Official Citation:Mark Harfouche ; Naresh Satyan ; Arseny Vasilyev ; Amnon Yariv; Compressive sensing optical coherence tomography using randomly accessible lasers. Proc. SPIE 9109, Compressive Sensing III, 91090L (May 23, 2014); doi:10.1117/12.2048754.
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:53067
Deposited By: Tony Diaz
Deposited On:22 Dec 2014 18:50
Last Modified:10 Nov 2021 19:47

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