Page 666 - Introduction to Information Optics

650 11. Information Display with Optics

Az Az Az

Fig. 11.25. A 3-D object that is composed of two transparencies.

(b), and (c) show the real-time reconstruction of the hologram using EBSLM
at three different depths. We see that in Fig. 11.27(a), "V" is focused, whereas
"T" is focused as shown in Fig. 11.27(c) at a different depth; hence, the resulting
3-D display.

11.4.3. OPTICALLY ADDRESSED SPATIAL LIGHT MODULATORS

The other category of SLMs is the optically addressed spatial light modu-
lator, which converts incoherent spatial distribution of optical fields to the
coherent distribution of optical fields through the use of liquid crystals (LCs).
Liquid crystals are organic materials that process properties that are between
fluids and solids [32]. They have fluidlike properties such as fluidity and
elasticity and yet the arrangement of molecules within them exhibits structural
orders such as anisotropicity. Most liquid crystal molecules can be visualized

Fig. 11.26. Hologram of the 3-D object shown in Fig. 11.25.