Abstract
One of the most difficult problems in computer holography is to fabricate actual high-definition CGHs, i.e., to print the synthetic fringe pattern. In this chapter, we focus on the topics of the fabrication problem and discuss several techniques: home-made fringe printers, laser lithography, and wavefront printers. In particular, we devote pages to the technique of laser lithography because it is one of the best technique to fabricate HD-CGHs. The last three sections in this chapter are devoted to fabrication of full-color HD-CGHs. Three techniques are discussed in this chapter.
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Notes
- 1.
The author beliefs that the laser lithography is one of the best technique to fabricate HD-CGHs at the current stage.
- 2.
An unusual fringe printer that uses a CD-R writer and may bridge the gap is also reported [106].
- 3.
A printed dot is not a perfect circle because the LD used for the light source does not output a circular beam. In this printer, elliptical dots are intentionally printed to reduce the number of dots along the vertical direction and decrease the printing time.
- 4.
Using a rotation drum, spot-scanning can be speeded up. However, because a film-base material must be used instead of the glass-base photographic plate in this case, it is difficult to exactly adhere the film material to the drum.
- 5.
Note that “image-tilling fringe printer” is a word coined by the author.
- 6.
Note that the setup in Fig. 15.5 is slightly changed from the original setup Yoshikawa et al. proposed, because they use a combination of polarization beam splitter and polarizer-less LCOS in order to reduce power loss caused in the beam splitter to the utmost limit. However, unfortunately, polarizer-less LCOS is not an ordinary device.
- 7.
Rainbow holography is a technique to reconstruct thin holograms by a white-light illumination at the sacrifice of vertical parallax. Thus, the hologram is a kind of HPO (horizontal-parallax-only) CGH (see Sect. 8.4).
- 8.
- 9.
The price of a mask blank that the author could get in Japan was roughly US$30 for a 5 inches photomask in 2019.
- 10.
The optical density is given by \(\log (I_0/ I)\), where I and \(I_0\) are optical intensities of light passing through a portion with and without the light-shielding film, respectively.
- 11.
UV laser sources can be selected optionally.
- 12.
Vector scan is also possible in DWL 66\(^+\) but not used for printing CGHs.
- 13.
DWL 66\(^+\) has the capability of multi-level modulation. The maker: Heidelberg Instruments call the function Grayscale lithography.
- 14.
Word “digital holography” used here is much different from that recently used for digital handling and processing of fringes and wavefields. DWDH is considered as an analog technology from the aspect of recent digital holography.
- 15.
In practice, we first calculate the whole object field and then extract the window of \(W_{\mathrm {tile},x} \times W_{\mathrm {tile}, y}\).
- 16.
Here, we assume \(f_1 = f_2\) in setup (d) of Fig. 15.21.
- 17.
More accurate simulation than that described in Sect. 13.5.2.3 is desired for optimization of filter design. The reader interested in the more accurate simulation technique should refer to chapter 3 of [123].
- 18.
It is assumed that the recording material is a photo-polymer: Bayfol®HX200.
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Matsushima, K. (2020). Fabrication of High-Definition CGH. In: Introduction to Computer Holography. Series in Display Science and Technology. Springer, Cham. https://doi.org/10.1007/978-3-030-38435-7_15
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DOI: https://doi.org/10.1007/978-3-030-38435-7_15
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