Large size three-dimensional video by electronic holography using multiple spatial light modulators

Abstract

In this paper, we propose a new method of using multiple spatial light modulators (SLMs) to increase the size of three-dimensional (3D) images that are displayed using electronic holography. The scalability of images produced by the previous method had an upper limit that was derived from the path length of the image-readout part. We were able to produce larger colour electronic holographic images with a newly devised space-saving image-readout optical system for multiple reflection-type SLMs. This optical system is designed so that the path length of the image-readout part is half that of the previous method. It consists of polarization beam splitters (PBSs), half-wave plates (HWPs), and polarizers. We used 16 (4 × 4) 4K×2K-pixel SLMs for displaying holograms. The experimental device we constructed was able to perform 20 fps video reproduction in colour of full-parallax holographic 3D images with a diagonal image size of 85 mm and a horizontal viewing-zone angle of 5.6 degrees.

Three-dimensional reflection screens fabricated by holographic wavefront printer

“…Bruder et al claimed that a Fourier lens is needed to generate the phase function in a hologram printer using an amplitude SLM. However, we did not use a Fourier lens but electronic holography [15][16][17] technique to generate an arbitrary phase distribution. The optical system of our wavefront printer uses a collimated laser beam with 532-nm wavelength.…”

“…Undesirable lights, i.e., the transmission beam, high-order beam, and conjugate beam, are filtered out by a single-side band filter and a half-zone plate processing method [17][18][19] similar to an electronic holography system. [15][16][17] Then, the optical system demagnifies the modulated wavefront onto a holographic recording film made of covestro Bayfol ® HX102 photopolymer material. The reference beam is a plane wave and is incident perpendicular to the photopolymer from the opposite side of the object beam.…”

Alignment control of liquid crystals in a 1.0‐μm‐pitch spatial light modulator by lattice‐shaped dielectric wall structure

“…To overcome this problem, electronic holographic displays are required . These displays reproduce the wavefront of object light using spatial light modulators (SLMs) to reconstruct natural 3D images without the abovementioned conflict, because the eyes focus on the point at which the wavefront of the object light converges.…”

Image formation of holographic three-dimensional display based on spatial light modulator in paraxial optical systems

“…[14][15][16][17][18] They are primarily applied to encode the wavefront information of a 3-D object wave pertaining to depth cues into holographic fringe patterns. 24 Previous studies on holographic 3-D display and application included designing various optical imaging architectures, [25][26][27][28][29][30] to achieve effective and precise image reconstruction and image quality. Developments in material processing and related SLM packaging technologies have resulted in continual improvements in pixel pitch and pixel number, benefiting the development and application of holographic 3-D display.…”