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Optimisation of a polygon mirror-based spectral filter for swept source optical coherence tomography (SS-OCT)

Dobre, George and Duma, Virgil-Florin and Everson, Michael (2018) Optimisation of a polygon mirror-based spectral filter for swept source optical coherence tomography (SS-OCT). In: Podoleanu, Adrian G.H. and Bang, Ole, eds. 2nd Canterbury Conference on OCT with Emphasis on Broadband Optical Sources. Proceedings of SPIE . SPIE. ISBN 978-1-5106-1674-5. E-ISBN 978-1-5106-1675-2. (doi:10.1117/12.2283034) (KAR id:67051)

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Medical imaging using Optical Coherence Tomography (OCT) provides clinicians with 3D, high resolution reconstructions of microscopic structures, in depth. It has been initially developed for ophthalmology, in order to scan the retinas of patients to diagnose illness. The quality of the images depends upon their axial and lateral resolutions and the properties of the light being used. Research using a polygon mirror (PM) as a spectral filter in Swept Source OCT (SS-OCT) has resulted in a variety of different experimental arrangements. Although the application of PM-based SS-OCT sources has been successfully demonstrated, the combination of their components’ fundamental properties and the overall impact they have on imaging performance is rarely reported. A more detailed examination of these properties would lead to a full description of their operation and to the best methods to employ if system performance is to be maximised. This work presents our current findings of on-going research into the optimisation of PM-based SS-OCT systems. A swept source spectral filter, consisting of a collimator, a transmission grating, a two-lens telescope and an off-axis PM with an end reflector mirror has been evaluated experimentally and compared with theoretical predictions. The system’s performance has been compared for two different fibre collimators. Although the beam width on the grating is different for each of the two collimators, the spot size at the PM facet is made the same by selecting appropriate focal lengths. An improvement in the signal roll-off at the interferometer output of ~1.0 dB/mm was obtained when using a 3.4 mm collimator compared to a 1.5 mm collimator.

Item Type: Book section
DOI/Identification number: 10.1117/12.2283034
Uncontrolled keywords: optical coherence tomography (OCT), spectral filter, polygon mirror (PM), spectral tuning, wavelength sampling, swept source (SS)
Divisions: Divisions > Division of Natural Sciences > Physics and Astronomy
Depositing User: George Dobre
Date Deposited: 16 May 2018 14:20 UTC
Last Modified: 16 Feb 2021 13:54 UTC
Resource URI: (The current URI for this page, for reference purposes)
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