Abstract
We present a newly developed single mode fiber based swept source polarization sensitive optical coherence tomography system using a single input state at 1040 nm. Two non-polarizing fiber based beam splitters are combined to form a Mach-Zehnder interferometer, while two polarizing beam splitters are used to obtain a polarization sensitive detection. Both types of beam splitters solely feature conventional single mode fibers. Polarization control paddles are used to set and maintain the polarization states in the fibers of the interferometer and detection unit. By use of a special paddle alignment scheme we are able to eliminate any bulk optic wave plates and polarization maintaining fibers in the interferometer and detection paths while preserving the advantages of a single input state system that illuminates the sample with circularly polarized light. To demonstrate the capabilities of our system, we performed retinal measurements on healthy human volunteers.
Highlights
Developed more than two decades ago OCT is nowadays widely used in medical research, diagnostics and many other fields [1,2,3,4]
We demonstrate the suitability of the system for in vivo retinal imaging on healthy human volunteers. 3.1 Measurements on a test sample Based on our alignment procedure and according to theoretical considerations published elsewhere [18,35] retardation and axis orientation measurements should be independent of each other ( see Eq (2) and (3))
We developed a new SS-polarization sensitive OCT (PS-OCT) system built with conventional single mode (SM) fibers in the interferometer and detection unit
Summary
Developed more than two decades ago OCT is nowadays widely used in medical research, diagnostics and many other fields [1,2,3,4]. Due to its ability to non-invasively provide high resolution cross-sectional data at short acquisition times, OCT is best suited for in vivo imaging. The combination of these characteristics with the transparency of ocular media, as well as its thin layer composition, paved the way to OCT’s most prominent applications in ophthalmology [5]. The initially developed time domain OCT technique was almost entirely replaced by Fourier domain (FD) techniques, mainly due to sensitivity and imaging speed advantages [6,7,8]. In general SS-OCT is associated with a higher imaging speed, currently being up to 10 times faster than SD-OCT [11]
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