  We have extended Laser Doppler holographic microscopy to transmission
geometry. The technique is validated with living fish embryos imaged by a
modified upright bio-microcope. By varying the frequency of the holographic
reference beam, and the combination of frames used to calculate the hologram,
multimodal imaging has been performed. Doppler images of the blood vessels for
different Doppler shifts, images where the flow direction is coded in RGB
colors or movies showing blood cells individual motion have been obtained as
well. The ability to select the Fourier space zone that is used to calculate
the signal, makes the method quantitative.
