Highly efficient optical reconstruction of digital holograms for deformation and shape control

The paper is dealing with the technology of spatial light modulators in the field of diffractive optics. A short overview of the actual micro-display technology leads to the parameters and the performance of the implemented systems. The main goal of this paper is to demonstrate the adaptation of the digital hologram to the reconstructing device. Modulation measurements for the SLM system lead to complex modulation curves, which can be applied to the pixel matrix delivered from the recording digital camera. Here we focus onto a transfer of the linear grey scale recording of the CCD-camera to a linear phase modulation of the SLM. A second step can improve the diffraction efficiency of the phase structure by an optimized arrangement of the phase levels along the dynamic range of the SLM. This digital post-processing can improve the light efficiency of the system drastically. The applications in deformation and shape control discuss experimental realization, alignment problems and solutions found while improving the experimental system.