  A polarization-multiplexed, dual-beam setup is proposed to expand the field
of view for a swept source optical coherence tomography angiography (OCTA)
system. This method used a Wollaston prism to split sample path light into two
orthogonal-polarized beams. This allowed two beams to shine on the cornea at an
angle separation of ~ 14 degrees, which led to a separation of ~ 4.2 mm on the
retina. A 3-mm glass plate was inserted into one of the beam paths to set a
constant path length difference between the two polarized beams so the
interferogram from the two beams are coded at different frequency bands. The
resulting OCTA images from the two beams were coded with a depth separation of
~ 2 mm. 5x5 mm2 angiograms from the two beams were obtained simultaneously in 4
seconds. The two angiograms then were montaged to get a wider field of view
(FOV) of ~ 5x9.2 mm2.
