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We present a novel approach to actively match the sampling of two linear array spectrometers to a precision of 0.001% of their total spectral range. We show that with a simple scaled subtraction of data from matched spectrometers, we are able to achieve more than two orders-of-magnitude excess noise suppression in balanced spectral domain visible light Optical Coherence Tomography. We demonstrate retinal imaging with visible light OCT at high-speed (70,000 axial scans per second) and low power (125 microwatts) at near the shot noise limit, even using a relatively inexpensive supercontinuum light source with a 30 MHz repetition rate.
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