Fig. 1. Schematic of FFOCT system

Fig. 2. Schematic of the optical path of the system when the mirror M₃, beam splitter BS₂, and plane mirror M₂ have orientation deviation

Fig. 3. Schematic of orientation deviation analysis of Michelson interferometer part

Fig. 4. Schematic of orientation deviation analysis from the second beam splitter to the mirror

Fig. 5. Schematic of partial orientation deviation analysis between sample and mirror M3

Fig. 6. Schematic of system light path when only the mirror M₃ has an orientation deviation

Fig. 7. Influence of the orientation deviation of the mirror M₃. (a) Change of system visibility with the increase of imaging depth under different orientation deviations; (b) change of system visibility with the increase of mirror orientation deviation at different imaging depths

Fig. 8. Relationship between the compensation range and the orientation deviation at different imaging depths. (a) ∆d=1 μm; (b) ∆d=5 μm; (c) ∆d=10 μm

Fig. 9. Imaging of onions. (a) Microscopic image of onion surface; (b)-(d) en face images of onion at depths of 0, 10, 15 µm, respectively