Fig. 1.

Experimental setup and sample configuration. (a) The optical setup consisted of an SD-OCT system and a PF beam combined in free space with the OCT sample arm beam such that the foci of both beams were co-aligned in 3D space. Current-control input from a function generator modulated the power of the PF beam. SLD: superluminencent diode, LD: laser diode, PR: photoreceiver, LP: long-pass dichroic filter, BCM: beam control module, XY: two-axis galvanometer, OBJ: objective lens. (b) Profile of F_rad(z) as a function of depth, z, w.r.t. the focal plane of the PF beam at 78-mW PF beam power. (c) Peak F_rad as a function of PF beam power, P, at the sample. Linear best-fit line is shown. In (b) and (c), F_rad(z) was measured on 1.7-µm polystyrene beads in 10% glycerol-water mixture (refractive index 1.3469).