Abstract
In this paper, we present a multicolor display via referenceless phase holography (RELPH). RELPH permits the display of full optical wave fields (amplitude and phase) using two liquid crystal phase-only spatial light modulators in a Michelson-interferometer-based arrangement. Complex wave fields corresponding to arbitrary real or artificial 3D scenes are decomposed into two mutually coherent wave fields of constant amplitude whose phase distributions are modulated onto the wave fields reflected by the respective light modulators. Here, we present the realization of that concept in two different ways: firstly, via temporal multiplexing using a single setup, switching between wavelengths for temporal integration of the respective wavefields; secondly, using spatial multiplexing of different wavelengths with multiple Michelson-based setups; and finally, we present an approach to magnify the 3D scenes displayed by light modulators with limited space–bandwidth product for a comfortable viewing experience.
Highlights
Holography still represents—at least in principle—the gold standard of three-dimensional display [1,2,3]
In this paper, we present a multicolor display via referenceless phase holography (RELPH)
We present the realization of that concept in two different ways: firstly, via temporal multiplexing using a single setup, switching between wavelengths for temporal integration of the respective wavefields; secondly, using spatial multiplexing of different wavelengths with multiple Michelson-based setups; and we present an approach to magnify the 3D scenes displayed by light modulators with limited space–bandwidth product for a comfortable viewing experience
Summary
Holography still represents—at least in principle—the gold standard of three-dimensional display [1,2,3]. To reconstruct the wave fields, we use a Michelson-interferometer-based setup with two SLMs modulating the respective phase distributions. The second given color multiplexing method is based on superpositioning the reconstructed holographic wave fields of different wavelengths spatially. Low-spatial-frequency manufacturing deformations in the μm range add additional phase terms φ1(x, y), φ2(x, y), where the mutual phase difference ∆φ(x, y) = φ1(x, y) − φ2(x, y) generates spurious interference patterns To compensate this phase difference, ∆φ phase-shifting can be applied by recording several interferograms while addressing the SLMs with constant phases of defined phase differences.
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