Scalable multiplexing for parallel imaging with interleaved optical coherence tomography.
We demonstrate highly parallel imaging with interleaved optical coherence tomography (iOCT) using an in-house-fabricated, air-spaced virtually-imaged phased array (VIPA). The air-spaced VIPA performs spectral encoding of the interferograms from multiple lateral points within a single sweep of the source and allows us to tune and balance several imaging parameters: number of multiplexed points, ranging depth, and sensitivity. In addition to a thorough discussion of the parameters and operating principles of the VIPA, we experimentally demonstrate the effect of different VIPA designs on the multiplexing potential of iOCT. Using a 200-kHz light source, we achieve an effective A-scan rate of 3.2-MHz by multiplexing 16 lateral points onto a single wavelength sweep. The improved sensitivity of this system is demonstrated for 3D imaging of biological samples such as a human finger and a fruit fly.
E.L. Ginzton Laboratory and Department of Electrical Engineering Stanford University, Stanford, CA 94305, USA.
Hee Yoon
HY
Lee
E.L. Ginzton Laboratory and Department of Electrical Engineering Stanford University, Stanford, CA 94305, USA.
Tahereh
T
Marvdashti
E.L. Ginzton Laboratory and Department of Electrical Engineering Stanford University, Stanford, CA 94305, USA.
Lian
L
Duan
E.L. Ginzton Laboratory and Department of Electrical Engineering Stanford University, Stanford, CA 94305, USA.
Saara A
SA
Khan
E.L. Ginzton Laboratory and Department of Electrical Engineering Stanford University, Stanford, CA 94305, USA.
Audrey K
AK
Ellerbee
(110.4500) Optical coherence tomography; (110.6880) Three-dimensional image acquisition; (170.3880) Medical and biological imaging; (250.7260) Vertical cavity surface emitting lasers