Fig. 3.

The area of neural tissue activation (at 473 nm) along with depth from the fiber-end under different fiber output powers and diameters. 4 and 8 mW fiber output powers with (a) 1.3 mW/mm², (b) 5 mW/mm² and (c) 10 mW/mm² threshold criterion. 12 and 16 mW fiber output powers with (d) 1.3 mW/mm², (e) 5 mW/mm² and (f) 10 mW/mm² threshold criterion. For all graphs, the dashed and thick solid lines represent lower (4 and 12 mW) and higher (8 and 16 mW) powers, respectively. The dotted horizontal lines represent area of the four fiber diameters (100, 200, 300, and 400 μm; see Fig. 3(f)).