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Figure 3: A schematic of the spectrometer. The grating diffracts the broadband collimated beam. The lens system acts as a scan lens and focuses the diffracted light beams on the focal plane array of a line scan camera. The focal length of the lens mechanism is designed such that the desired spectrum (1200 nm to 1400 nm) is covering the extent of the detector array. Optical aberrations in this scan lens system are minimized to reduce the sensitivity roll-off of the OCT images.