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Schematic of the depth sensitive Raman spectrometer for rat measurements. L1: collimation lens; LLF: laser line filter; ID1, ID2: iris diaphragm; AX1, AX2: axicon; L2, L3: beam shrinker; L4, L5, AX3, L6: custom lens assembly; AD1, AD2: achromatic doublet; LPF: long pass filter; PE: proximal end of fiber bundle; DE: distal end of fiber bundle; Ring 1-5: DE linear fiber bundles corresponding to PE rings.
