scholarly journals Holographic Recording Performance of Acrylate-Based Photopolymer under Different Preparation Conditions for Waveguide Display

Polymers ◽  
2021 ◽  
Vol 13 (6) ◽  
pp. 936
Author(s):  
Zhongwen Shen ◽  
Yishi Weng ◽  
Yuning Zhang ◽  
Chuang Wang ◽  
Ao Liu ◽  
...  
Keyword(s):  
Augmented Reality ◽  
Diffraction Efficiency ◽  
Green Light ◽  
Holographic Recording ◽  
Holographic Gratings ◽  
Preparation Conditions

This work proposes a green light-sensitive acrylate-based photopolymer. The effects of the preparation conditions for the waveguide applied volume holographic gratings (VHGs) were experimentally investigated. The optimum preparation conditions for holographic recording were revealed. After optimization, the peak of VHG diffraction efficiency reached 99%, the diffractive wavelength bandwidth increased from 13 nm to 22 nm, and the corresponding RIM was 0.06. To prove the wide application prospect of the acrylate-based photopolymer in head-mounted augmented reality (AR) displays, green monochromatic volume holographic waveguides were fabricated. The display results showed that the prototype was able to achieve a 28° diagonal FOV and possessed a system luminance of 300 cd/m2.

EXPERIMENTAL INVESTIGATION OF THE PHOTOCHROMIC EFFECT AND TWO-COLOR HOLOGRAPHIC RECORDING IN NEAR-STOICHIOMETRIC LiNbO3:Fe:Mn CRYSTALS

2012 ◽  
Vol 21 (04) ◽  
pp. 1250052 ◽  
Author(s):  
YOUWEN LIU ◽  
YUANYUAN ZHOU ◽  
MINJUN ZHU ◽  
CONGJUN HE
Keyword(s):  
Diffraction Efficiency ◽  
Red Light ◽  
Oxidation Time ◽  
Oxygen Atmosphere ◽  
Holographic Recording ◽  
Pump Probe ◽  
Holographic Gratings ◽  
Speed Increase ◽  
Before And After ◽  
Photochromic Effect

Near-stoichiometric LiNbO3:Fe:Mn crystals are grown, then annealed in the oxygen atmosphere at 900°C for 6, 10 and 18 h. The photochromic effect of samples are investigated by measuring UV/VIS/NIR spectra before and after illumination of sensitizing light of 405 nm, and the dynamic characteristics were evaluated by use of the pump–probe method. Both the saturated absorption change and the photochromic speed increase with increases in the sensitizing intensity and the Fe concentration. In the two-color recording experiment, the holographic gratings were recorded by a red light of 633 nm, simultaneously sensitized by a violet light of 405 nm. The results show that the saturated diffraction efficiency increases with an increase in the ratio of recording light to sensitizing beam intensities, however, the sensitivity decreases. Higher concentration of Fe enables higher diffraction efficiency and higher sensitivity. In our investigation, the photochromic effect, and the two-color recording properties have little dependence on the oxidation time in the oxygen atmosphere when the oxidation time is longer than 6 h. An optimization may be obtained by further modifying these conditions appropriately.

Effect of the Structure and Content of Carbazolyl-Containing Co-oligomers on the Diffraction Efficiency of Holographic Recording Media

2015 ◽  
Vol 51 (1) ◽  
pp. 67-71 ◽  
Author(s):  
Yu. P. Getmanchuk ◽  
N. A. Davidenko ◽  
I. I. Davidenko ◽  
E. V. Mokrinskaya ◽  
V. A. Pavlov ◽  
...  
Keyword(s):  
Diffraction Efficiency ◽  
Holographic Recording ◽  
Recording Media ◽  
Holographic Recording Media

scholarly journals Investigations of As-S-Se thin films for use as inorganic photoresist for digital image-matrix holography

Open Physics ◽  
2011 ◽  
Vol 9 (5) ◽  
Author(s):  
Andrejs Bulanovs ◽  
Vjacheslavs Gerbreders ◽  
George Kirilovs ◽  
Janis Teteris
Keyword(s):  
Thin Films ◽  
Digital Image ◽  
Diffraction Grating ◽  
Spatial Light Modulator ◽  
Laser Intensity ◽  
Holographic Recording ◽  
Light Modulator ◽  
Frame Size ◽  
Holographic Gratings ◽  
Relief Phase

AbstractAs-S-Se chalcogenide thin films are successfully employed in classical and dot-matrix holography as inorganic photoresists for obtaining a relief-phase hologram. However using these films for image-matrix hologram recording has not been studied due to some features of image-matrix technology. For the applied research of the optical properties of As-S-Se films an experimental device of digital image-matrix holographic recording based on 100 mW 405 nm semi-conductor laser and Spatial Light Modulator (SLM) has been created. The device has the following main parameters: 140 × 105 µm frame size; laser intensity during exposure 10 W/cm2. With the help of this device diffraction grating and security holograms were recorded on As-S-Se thin films. The work reported herein presents results of an experimental study of how diffraction efficiency (DE) of the received relief-phase holographic gratings depends on an exposure and period. Diffraction grating profiles and speed of etching corresponding to different exposure doses are shown. Hologram samples with DE = 65% have been received which allows for using chalcogenide film as alternative to organic photoresists in applied dot-matrix and image-matrix holography.

Diffraction efficiency optimization for multilayered parametric holographic gratings

2021 ◽  
Author(s):  
José Pinto ◽  
Rubén Aylwin ◽  
Gerardo Silva-Oelker ◽  
Carlos Jerez-Hanckes
Keyword(s):  
Diffraction Efficiency ◽  
Holographic Gratings ◽  
Efficiency Optimization

scholarly journals A New Three-Component Photo-Initiating System for Visible Light Recording of Volume Holograms with Single-Pulsed Laser

Polymers ◽  
2021 ◽  
Vol 13 (20) ◽  
pp. 3517
Author(s):  
Horst Berneth ◽  
Friedrich Karl Bruder ◽  
Thomas Fäcke ◽  
Sven Hansen ◽  
Koichi Kawamura ◽  
...  
Keyword(s):  
Alkyl Radical ◽  
Pulsed Laser ◽  
Holographic Recording ◽  
Radical Species ◽  
Holographic Gratings ◽  
Initiation System ◽  
Volume Holograms ◽  
Recording Material ◽  
Safranine O ◽  
Dye Molecule

Versatile substituted electron-deficient trichloromethylarenes can easily be synthesized and combined with a Safranine O/triarylalkylborate salt to form a highly efficient three-component photo-initiation system that starts free radical polymerization to finally form holographic gratings with a single-pulsed laser. The mechanism of this photo-initiation most likely relies on an electron transfer from the borate salt into the semi-occupied HOMO of the excited dye molecule Safranine O, which after fragmentation generates an initiating alkyl radical and longer-lived dye radical species. This dye radical is most probably oxidized by the newly introduced trichloromethylarene derivative as an electron acceptor. The two generated radicals from one absorbed photon initiate the photopolymerization and form index gratings in a suitable holographic recording material. This process is purely photonic and does not require further non-photonic post treatments.

Design and Fabrication of Volume Holographic Gratings with Large Angular Bandwidth and High Diffraction Efficiency

2021 ◽  
Vol 41 (2) ◽  
pp. 0205001
Author(s):  
鲁婷婷 Lu Tingting ◽  
冯奇斌 Feng Qibin ◽  
王梓 Wang Zi ◽  
吕国强 Lü Guoqiang
Keyword(s):  
Diffraction Efficiency ◽  
Holographic Gratings ◽  
High Diffraction Efficiency ◽  
High Diffraction

scholarly journals Diffraction Efficiency Enhanced Volume Holographic Gratings via Coupling Ag Thin Film

2019 ◽  
Vol 11 (1) ◽  
pp. 1-5
Author(s):  
Yunping Qiu ◽  
Zhuoya Zhu ◽  
Xiaodie Wang ◽  
Xin Wang ◽  
Yongming Tang ◽  
...  
Keyword(s):  
Thin Film ◽  
Diffraction Efficiency ◽  
Holographic Gratings

scholarly journals A Facile Fabrication Route of Poly(Ethylene Glycol Phenyl Ether Acrylate) Photopolymers with Efficient Optical Response for Holographic Storage

Crystals ◽  
2020 ◽  
Vol 10 (10) ◽  
pp. 935
Author(s):  
Fang-Yong Lee ◽  
Xin-Jin Wang ◽  
Wei-Hung Su ◽  
Tzu-Chien Hsu
Keyword(s):  
Ethylene Glycol ◽  
Response Time ◽  
Diffraction Efficiency ◽  
Optical Parameter ◽  
Optical Response ◽  
Holographic Recording ◽  
Initiator Concentration ◽  
Holographic Storage ◽  
Poly Ethylene ◽  
Exposure Energy

A series of photopolymers based on ethylene glycol phenyl ethyl arylate (EGPEA) monomers and poly(methyl methacrylate) (PMMA) matrix with varying initiator concentrations and sample thicknesses have been synthesized and their optical performance characterized in this study. The advantages of lowering the initiator concentration, including a rather short initiation time within a few seconds; a sharp rising optical response; and a stable saturated diffraction efficiency are demonstrated. The variation in the diffraction efficiency and response time with the exposure energy under various sample thickness and initiator concentrations is examined; a diffraction efficiency as high as 80% and a relatively short response time of 12–39 s are attainable. The dependence of the normalized optical parameter “sensitivity” on the exposure time is depicted, and the peak value of S ranges vastly from about 0.2 to 1.2 × 104 cm/J within a period of 15 s or so, with a maximum value of nearly 1.2 × 104. Favorable evidence of low initiator concentration can further be found when the dependence of the saturated diffraction efficiency with the exposure energy is examined. The data from this study using a low initiator concentration cover a range of exposure energy from 100 to 800 mJ/cm2 and a saturated diffraction efficiency from about 15% to 80%. The successful image reconstruction of 6-membered-ring metal nuts on a hologram based on this EGPEA/PMMA photopolymer system using a reflective holographic recording setup is demonstrated to verify its applicability to holographic storage.

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