Abstract
We propose an optical system for synthesizing double-phase complex computer-generated holograms using a phase-only spatial light modulator and a phase grating filter. Two separated areas of the phase-only spatial light modulator are optically superposed by 4-f configuration with an optimally designed grating filter to synthesize arbitrary complex optical field distributions. The tolerances related to misalignment factors are analyzed, and the optimal synthesis method of double-phase computer-generated holograms is described.
Highlights
Complex spatial light field modulation technology using spatial light modulators (SLMs) has been actively researched since the beginning of digital holography [1,2,3]
The noise inherent in the double-phase hologram (DPH) has not been a central issue in complex optical field synthesis, but our analysis shows that the effect of the translation mismatch and long propagation diffraction is profoundly influential on the imaging quality of holographic 3D images displayed by the DHP system
We propose a DPH system using a phase-only SLM with a grating filter, and analyze the intriguing degradation effect observed in the proposed DHP system associated with misalignment and diffraction, and its physical mechanism
Summary
Complex spatial light field modulation technology using spatial light modulators (SLMs) has been actively researched since the beginning of digital holography [1,2,3]. An advance in the DPH technique has been reported, wherein a polarization sensitive component (PSC) and a polarizer were used to combine two adjacent phase-only pixels within a short distance enabling neglect of the diffraction effect on the complex modulation [5]. The PSC element and polarizer are not cost-effective and it is not easy to make large size complex SLMs due to the practical limitation in scaling the PSC element These previous works have inspired a basic question regarding the possibility of making a DPH configuration using cost-effective non-polarization elements, and a strong need for investigation of the design and analysis of bulk-optic DPH systems and compact device-level DPH architectures.
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