Extended measuring depth dual-wavelength Fourier domain optical coherence tomography

Al-Mohamedi, Haroun; Kelly-Pérez, Ismael; Oltrup, Theo; Cayless, Alan and Bende, Thomas (2021). Extended measuring depth dual-wavelength Fourier domain optical coherence tomography. Biomedical Engineering / Biomedizinische Technik, 66(6) pp. 557–562.

DOI: https://doi.org/10.1515/bmt-2020-0350

Abstract

In this work an enhanced wide range dual band spectral domain optical coherence tomography technique (SD-OCT) is presented to increase the depth and accuracy of the measurement of optical A-scan biometry. The setup uses a Michelson interferometer with two wide-spectrum Superluminescent Diodes (SLD). The emissions of the SLDs are filtered by a long-pass filter (900 nm) in front of the reference mirror. The light is spectrally decomposed using a single reflective diffraction grating (1,800 lines/mm) and the whole spectrum captured with two CCD line sensors. The capabilities of the system have been validated using a self-made human model eye.