
Second Harmonic Generation Imaging216
It is interesting to note that for a > 1, the sensitivity is increased, as the phase varies more rapidly for
the same Δz displacement. In contrast, the medium for which a < 1 reduces the sensitivity. is suggests
a way to tune the sensitivity by appropriate selection of the surrounding medium or laser wavelength.
9.6 Selected Applications
We have, up to now, discussed all the underlying bases of holographic SHG imaging: we have cov-
ered the principles of holography, the implementation of a holographic SHG microscope, the numerical
reconstruction of digital holograms, and the various types of image contra ...