Encoding multiple objects in computer-generated holograms with synthetic spectrum

A method for encoding multiple objects by using the synthetic spectrum in Fourier transform computer generated holograms (CGH) of detour phase is proposed. The method allows multiple objects encoded in a CGH using synthesized spectrum instead of single spectrum used in conventional method. In reconstruction, multiple objects are reconstructed around the same diffraction order simultaneously, and various forms of reconstructed images are obtained easily. Optical reconstruction of the CGH was demonstrated with a liquid crystalspatial light modulator (LC-SLM). The experiment result verified the effectiveness of the method and it showed that the method could improve the information capacity of CGH.