Light-efficient beamsplitter for Fourier-domain full-field optical coherence tomography

Optics Letters  2020 | Vol. 45, Issue 5 | 1240-1243

Egidijus Auksorius


Any full-field optical coherence tomography (FF-OCT) system wastes almost 75% of light, including 50% of the OCT signal, because it uses a 50/50 beamsplitter (BS) in the standard implementation. Here, a design of a light-efficient BS is presented that loses almost no light when implemented in Fourier-domain FF-OCT. It is based on pupil engineering and a small highly asymmetric BS. The presented signal-tonoise ratio (SNR) analysis demonstrates almost four times improvement over the conventional design. In addition, it is shown that the light-efficient BS can be used to suppress specular reflections from a sample and, thus, further improve the SNR.

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This project has received funding from the European Union’s
Horizon 2020 research and innovation programme
under grant agreement No 666295.