Fig. 2.

Optical schematic of a custom-built imager for OCT-guided TPM. The TPM (970 nm) and OCT (1317 nm) beams are co-linear. Animal is positioned on a computer-controlled, motorized three-axis AS. EOM, electro-optic modulator; S, shutter; SF, spatial filter; L, lens; M, mirror; D, dichroic beamsplitter; Gx and Gy, galvanometers; BS, glass beamsplitter; BP, band-pass filter; PMT, photomultiplier tube; WL LED, white light light-emitting diode; CCD, charge coupled device camera; DC, dispersion cube; $1\times 2$, fiber coupler; C, circulator; PC, polarization controllers; VHPG, volumetric holographic phase grating; MEFO, multielement focus objective; LAD, linear array detector; and SLD, superluminescent diode.