Not sure if this was posted before, but I found this paper, Compact Imaging using a Denselight SLED.
First-generation miniature multiple reference optical coherence tomography imaging device
McNamara, P., Dsouza, R., O’Riordan, C., Collins, S., O’Brien, P., Wilson, C., Hogan, J., Leahy, M., Journal of Biomedical Optics, December 2016.
https://compactimaging.com/first-generation-miniature-multiple-reference-optical-coherence-tomography-imaging-device-2/