967613.fig.004a
(a)
967613.fig.004b
(b)
967613.fig.004c
(c)
Figure 4: (a) Evolution of the forward and backward SHG intensities as a function of wavelength, showing the increase of signal as the wavelength approaches the DR1 resonance. The inset represents the absorbance spectra of DR1. (b) and (c) Reconstructed and renormalized B/W image from respectively the forward and backward SHG signals.