Figure 15

Schematic diagram of the experimental setup. WS: white light source; BS: beam splitter; DM: dichroic mirror; L1, L2: two convex lenses consisting of a 4f relay system; L3: convex lens; Inset: section of the samples and the focusing laser in the yz plane¹²⁹. Reproduced from Ref. 129 (with the permission of Wiley).