Fig. 5.

Multichannel imaging of human skin in vivo (forearm, dermal papillae at $70\mu \mathrm{m}$ imaging depth); AF: autofluorescence; SHG: second-harmonic generation; CARS: coherent anti-Stokes Raman scattering; FLIM: fluorescence lifetime imaging (${\tau }_m=\text{mean lifetime}$).