Fig. 1.

Diagram of the instrument used to acquire cross-sectional OCT images and co-localized Raman spectra through a common objective lens. Abbreviations: SLD, superluminescent diode; FI, faraday isolator; FC, fiber coupler; REF, reference arm; PC, polarization controller; GM, galvanometer mirror; 4F, 4F lens system; spec1, spectrometer #1; LD, laser diode; BSO, beam shaping optics; BP, bandpass filter; DBS, dichroic beamsplitter; NF, notch filter; MMF, multimode fiber; spec2, spectrometer #2; FM, flip mirror; OBJ, objective lens; MTS, motorized translation stage.