Figure 2.

Efficient excitation of far-red fluorophores with fiber-pumped diamond Raman laser. A compilation of peak two-photon absorption cross sections from published literature^{5, 11, 49}. The triangle is from Ref. 5, circles are from Ref. 11, and squares are from Ref. 49. The three wavelength bands of the dual output laser system shown overlaid on the graph, 1240 nm diamond Raman laser (red), 1055 nm ytterbium fiber amplifier (orange), and 1140 nm 2C2P excitation (striped). The laser system offers simultaneous and complete excitation coverage for fluorophores within the range of 1000–1300 nm.