3D holographic printer: Fast printing approach

Abstract

This article describes the general operation principles of devices for synthesized holographic images such as holographic printers. Special emphasis is placed on the printing speed. In addition, various methods to increase the printing process are described and compared.

Photoinitiation and Inhibition under Monochromatic Green Light for Storage of Colored 3D Images in Holographic Polymer-Dispersed Liquid Crystals

“…Furthermore, a numerical equation was successfully built to describe the relation between the segregation degree and the ratio of gelation time to mixture viscosity. This useful equation worked very well for both holographic photopolymer/nanoparticle composites and HPDLCs. , In addition, concurrent increase of the diffraction efficiency and decrease of switching voltage can be enabled using the photoinitibitor. , Nevertheless, it is impractical to employ the monochromatic blue light photoinitibitor for constructing holograms under green light due to the severe restriction of the First Law of Photochemistry, while holography under green light is of critical importance considering the relatively low cost of the laser source and high tolerance to ambient vibration for image reconstruction . Meanwhile, despite the wide applications of the rose bengal (RB)/ N -phenylglycine (NPG) photoinitiating system in green laser holography, ,− the photoinitiation and inhibition functions of the RB/NPG system as well as its control capability over the formation of HPDLCs remain unclear.…”

“…3,35 Nevertheless, it is impractical to employ the monochromatic blue light photoinitibitor for constructing holograms under green light due to the severe restriction of the First Law of Photochemistry, while holography under green light is of critical importance considering the relatively low cost of the laser source and high tolerance to ambient vibration for image reconstruction. 51 Meanwhile, despite the wide applications of the rose bengal (RB)/N-phenylglycine (NPG) photoinitiating system in green laser holography, 41,52−56 the photoinitiation and inhibition functions of the RB/NPG system as well as its control capability over the formation of HPDLCs remain unclear. Furthermore, it is reported to be hard to obtain bright 3D images in HPDLCs due to the limited resolution, 57 and colored 3D images identifiable to the naked eye under white light have not been reconstructed using the RB/NPG photoinitiating system.…”

Roadmap on holography

“…An example how this can be utilized to design highly accurate recording schemes with photopolymers is given in [78]. For master vHOE recording holographic printer designs were published in the last years that are able to deal with photopolymers [79][80][81][82][83][84][85][86][87]. The start of this was also triggered by building recorders for holographic optical data storage [88].…”

Progress in the Synthetic Holographic Stereogram Printing Technique

“…The relationship between the total time of holographic printing and the factors such as hogel size, the light sensitivity of recording material, laser output power, exposure time, moving time, and waiting time was studied by Morozov et al [44]. Spatial splitting technology and time sequential technology were proposed to improve the printing efficiency, and for a hologram with size 10 × 10 cm, the overall printing time 250 min for conventional method reduced to 67 and 32 min, respectively.…”