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Experimental setup and sample configuration. The optical setup consisted of an SD-OCT system and a forcing beam combined in free space with the OCT sample arm beam. The forcing beam and the OCT beam were co-aligned at the sample. SLD: superluminescent diode, LD: laser diode, PR: photoreceiver, LP: long-pass dichroic filter, BCM: beam control module, XY: two-axis galvanometer.
