To record diffusively reflecting objects two basic types of set-ups are most frequently used (Kudrin, Poluchin, Čičenev, 1982):
Method by wavefront splitting, where a part of the wave is incident on the mirror and a part on the object, and these two are reflected to the holographic plate (Fig. 3–6).
Method by amplitude splitting where a part of light intensity is split into two directions, into the object and the reference beams (Fig. 3–7).
Fig. 3–6 Method by wavefront splitting for diffusively reflecting object
1 – laser, 2 – diverging lens, 3 – mirror, 4 – object, 5 – holographic plate
Fig. 3–7 Method by amplitude splitting for diffusively reflecting object