Abstract
Holographic display is an ultimate three-dimensional (3D) display technique that can produce the wavefront of 3D objects. The dynamic holographic display usually requires a spatial light modulator (SLM) with a following 4f system to eliminate the unnecessary orders produced by the grating structure of the SLM. We present a technique that displays the images without the 4f system. We detect the unnecessary wavefield by phase-shifting holography and suppress it using computational optimization. Experimental results are presented to verify the proposed method.
Highlights
Holography could create a light field identical to the one generated by a real three-dimensional (3D) object
The optical approaches usually achieve complex modulation by integrating and controlling phase-only or amplitude-only spatial light modulator (SLM) in different ways (Juday et al, 1991; Gregory et al, 1992; Neto et al, 1996; de Bougrenet de la Tocnaye and Dupont, 1997; Hsieh, 2007), while the computational techniques convert the complex field into equivalent phase-only (Hsueh and Sawchuk, 1978; Birch et al, 2000) or amplitude-only (Arrizón et al, 1998; Bingxia Wang et al, 2021) ones that adapt to the physical constraints of commercial light modulators
It should be mentioned that we suppose the dead area of the SLM acts as a “mirror.” the cover glass of the SLMs may be imperfect, which could result in an inaccurate estimation of the zero-order
Summary
Holography could create a light field identical to the one generated by a real three-dimensional (3D) object. The optical approaches usually achieve complex modulation by integrating and controlling phase-only or amplitude-only SLMs in different ways (Juday et al, 1991; Gregory et al, 1992; Neto et al, 1996; de Bougrenet de la Tocnaye and Dupont, 1997; Hsieh, 2007), while the computational techniques convert the complex field into equivalent phase-only (Hsueh and Sawchuk, 1978; Birch et al, 2000) or amplitude-only (Arrizón et al, 1998; Bingxia Wang et al, 2021) ones that adapt to the physical constraints of commercial light modulators The latter is referred to as hologram encoding.
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