Optimal Linearization in Holography

Optimal linearization in holography is studied from the nonlinear system theory point of view. A generalized optimal linearization method for a physical photographic emulsion is presented. A generalized first-order amplitude transmittance (i.e., the generalized transfer function) with respect to the input irradiance is determined. The application of this optimal linearization technique toward a simple point object hologram is demonstrated, and the extension of this linearized procedure for a more complicated object is also discussed. Finally, it is concluded that, instead of restricting the holographic recording in the linear region of the T-E curve of the photographic emulsion, it is possible to obtain the optimum first-order diffraction image. If the nonlinearity of the holographic recording is weak, it is possible to define a linearization such that it will not be possible to perceive the nonlinear distortion.