scholarly journals Digital Holographic Capture and Optoelectronic Reconstruction for 3D Displays

2010 ◽  
Vol 2010 ◽  
pp. 1-14 ◽  
Author(s):  
Damien P. Kelly ◽  
David S. Monaghan ◽  
Nitesh Pandey ◽  
Tomasz Kozacki ◽  
Aneta Michałkiewicz ◽  
...  
Keyword(s):  
Speckle Noise ◽  
Spatial Light Modulators ◽  
Holographic Recording ◽  
Light Modulators ◽  
Current State ◽  
Viable Solution ◽  
Recording Process ◽  
Digital Holograms ◽  
Display Technology ◽  
3D Capture

The application of digital holography as a viable solution to 3D capture and display technology is examined. A review of the current state of the field is presented in which some of the major challenges involved in a digital holographic solution are highlighted. These challenges include (i) the removal of the DC and conjugate image terms, which are features of the holographic recording process, (ii) the reduction of speckle noise, a characteristic of a coherent imaging process, (iii) increasing the angular range of perspective of digital holograms (iv) and replaying captured and/or processed digital holograms using spatial light modulators. Each of these challenges are examined theoretically and several solutions are put forward. Experimental results are presented that demonstrate the validity of the theoretical solutions.

scholarly journals Holographic Display System to Suppress Speckle Noise Based on Beam Shaping

Photonics ◽  
2021 ◽  
Vol 8 (6) ◽  
pp. 204
Author(s):  
Di Wang ◽  
Yi-Wei Zheng ◽  
Nan-Nan Li ◽  
Qiong-Hua Wang
Keyword(s):  
Optical Element ◽  
Speckle Noise ◽  
Beam Shaping ◽  
Diffractive Optical Element ◽  
The Other ◽  
Spatial Light Modulators ◽  
Viewing Angle ◽  
Display System ◽  
Holographic Display ◽  
Light Modulators

In this paper, a holographic system to suppress the speckle noise is proposed. Two spatial light modulators (SLMs) are used in the system, one of which is used for beam shaping, and the other is used for reproducing the image. By calculating the effective viewing angle of the reconstructed image, the effective hologram and the effective region of the SLM are calculated accordingly. Then, the size of the diffractive optical element (DOE) is calculated accordingly. The dynamic DOEs and effective hologram are loaded on the effective regions of the two SLMs, respectively, while the wasted areas of the two SLMs are performed with zero-padded operations. When the laser passes through the first SLM, the light can be modulated by the effective DOEs. When the modulated beam illuminates the second SLM which is loaded with the effective hologram, the image is reconstructed with better quality and lower speckle noise. Moreover, the calculation time of the hologram is reduced. Experiments indicate the validity of the proposed system.

scholarly journals High-quality micropattern printing by interlacing-pattern holographic femtosecond pulses

Nanophotonics ◽  
2020 ◽  
Vol 9 (9) ◽  
pp. 2895-2904 ◽  
Author(s):  
Zhipeng Wang ◽  
Xiaowei Li ◽  
Lan Jiang ◽  
Bohong Li ◽  
Qunshuo Wei ◽  
...  
Keyword(s):  
Femtosecond Laser ◽  
High Efficiency ◽  
Speckle Noise ◽  
Device Fabrication ◽  
Spatial Light Modulators ◽  
Direct Writing ◽  
Optical Fields ◽  
High Quality ◽  
Target Pattern ◽  
Light Modulators

AbstractTo improve the efficiency of femtosecond laser direct writing, holographic femtosecond laser patterning using spatial light modulators has been widely used for the processing of micro/nanopatterns. However, the speckle noise of modulated optical fields severely limits the quality of fabricated patterns. We present a simple and effective method which involves interlacing a target pattern into a series of target subpatterns that consist of spaced spots to solve this problem. The separation of spots weakens the random interference between adjacent spots of optical fields, so the speckle noise reduces effectively, which improves the uniformity of the modulated optical fields and makes the fabricated patterns with high quality. With optimal interlacing numbers, complex micropattern arrays containing curved edges and sophisticated structures can be fabricated with superior quality and high efficiency. Binary holograms with improved optical characterization are realized by using the interlacing-pattern method, revealing the extensive potential of this method in micropattern processing and functional device fabrication with high quality and efficiency.

New challenges for spatial light modulators: laser beam splitting and beam shaping, and reconstruction of digital holograms

2001 ◽  
Author(s):  
Sven Krueger ◽  
Guenther K. Wernicke ◽  
Hartmut Gruber ◽  
Nazif Demoli ◽  
Matthias Duerr ◽  
...  
Keyword(s):  
Laser Beam ◽  
Beam Shaping ◽  
Spatial Light Modulators ◽  
Beam Splitting ◽  
Light Modulators ◽  
Digital Holograms ◽  
New Challenges

Giant Anisotropy of Conductivity in Hydrogenated Nanocrystalline Silicon Thin Films

1998 ◽  
Vol 536 ◽  
Author(s):  
A. B. Pevtsov ◽  
N. A. Feoktistov ◽  
V. G. Golubev
Keyword(s):  
Thin Films ◽  
Film Thickness ◽  
Percolation Theory ◽  
Nanocrystalline Silicon ◽  
Spatial Light Modulators ◽  
Light Emitting ◽  
Light Modulators ◽  
Silicon Thin Films ◽  
Longitudinal Conductivity ◽  
Transverse Conductivity

AbstractThin (<1000 Å) hydrogenated nanocrystalline silicon films are widely used in solar cells, light emitting diodes, and spatial light modulators. In this work the conductivity of doped and undoped amorphous-nanocrystalline silicon thin films is studied as a function of film thickness: a giant anisotropy of conductivity is established. The longitudinal conductivity decreases dramatically (by a factor of 109 − 1010) as the layer thickness is reduced from 1500 Å to 200 Å, while the transverse conductivity remains close to that of a doped a- Si:H. The data obtained are interpreted in terms of the percolation theory.

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