scholarly journals Effect of light polarization on holographic recording in glassy azocompounds and chalcogenides

Open Physics ◽  
2011 ◽  
Vol 9 (2) ◽  
Author(s):  
Andris Ozols ◽  
Valdis Kokars ◽  
Peteris Augustovs ◽  
Ilze Uiska ◽  
Kaspars Traskovskis ◽  
...  
Keyword(s):  
Chemical Composition ◽  
Diffraction Efficiency ◽  
Light Polarization ◽  
Holographic Recording ◽  
Polarization Effects ◽  
Recording Efficiency ◽  
Field Rotation ◽  
Recording Beam ◽  
Polarization Dependences ◽  
Effect Of Light

AbstractLight polarization effects on a holographic grating recording in a glassy chalcogenide a-As40S15Se45 film has been experimentally studied and compared with previously studied glassy molecular azobenzene film 8a at 633, using s − s,p − p, CE-1 and CE-2 circular-elliptic recording-beam polarizations (differing by light electric field rotation directions). The azocompound exhibited much higher self-diffraction efficiency (SDE) and diffraction efficiency whereas chalcogenide was more sensitive. Their recording efficiency polarization dependences also were different. SDE up to 45% was achieved in 8a with p − p and up to 2.6% in a-As40S15Se45 with CE-2 polarized recording beams. The polarization changes in the diffraction process were studied as well in these and other materials (11, 16, 19 and a-As2S3 film, LiTaO3:Fe crystal). It was found that light polarization changes in the process of diffraction from gratings recorded vectorially by s−p polarizations depended on chemical composition, wavelength, and exposure time. Vector gratings with SDE up to 25% were recorded in 8a, rotating a linear polarization by 90°. No light polarization changes were found in azobenzene 19 and chalcogenide films and in LiTaO3:Fe crystal, thus showing a vector recording of scalar holograms. The recording mechanisms in azocompounds and chalcogenides are discussed and compared.

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.

Investigation on dynamic holographic display in liquid crystal film doped with carbon dots

2020 ◽  
Vol 10 (6) ◽  
pp. 780-787
Author(s):  
Hongyue Gao ◽  
Suna Li ◽  
Jicheng Liu ◽  
Wen Zhou ◽  
Fan Xu ◽  
...  
Keyword(s):  
Liquid Crystal ◽  
Electric Field ◽  
Real Time ◽  
Diffraction Efficiency ◽  
Carbon Dots ◽  
Applied Electric Field ◽  
Light Polarization ◽  
Forming Process ◽  
Time Dynamic ◽  
Holographic Display

In this paper, we studied the holographic properties of liquid crystal (LC) thin film doped with carbon dots (CDs) which can be used as real-time holographic display screen. The maximum value of diffraction efficiency can reach up to 30% by using a low applied electric field 0.2 V/μm. Holograms in the LC film can be dynamically formed and self-erased. The hologram build-up time and the hologram self-erasure time in the material is fast enough to realize video refresh rate. In addition, the forming process of hologram was studied. The holographic diffraction efficiency was measured depending on the intensity of recording light, applied electric field, the intensity of readout light, and readout light polarization direction. Triple enhancement of the diffraction efficiency value by the modulation of voltage under the condition of low recording energy is presented. Therefore, we develop an easy way to obtain real-time dynamic holographic red, green and blue displays with high diffraction efficiency, which allow the LC film doped with CDs to be used as a holographic 3D display screen.

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 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.

Improvement of Pulsed Holographic Recording Characteristics of Polyvinyl Alcohol/Acrylamide Green-Sensitive Photopolymer

2014 ◽  
Vol 1035 ◽  
pp. 492-496
Author(s):  
Gang Chen ◽  
Jian Hua Zhu ◽  
Zhen Xiong Luo ◽  
Yu Zhao ◽  
Ze Ren Li
Keyword(s):  
Energy Density ◽  
Polyvinyl Alcohol ◽  
Diffraction Efficiency ◽  
Delay Time ◽  
High Speed ◽  
Transient Processes ◽  
Holographic Recording ◽  
Application Prospects

Coherent pre-illumination technique is proposed to improve the pulsed holographic recording characteristics of polyvinyl alcohol (PVA) /acrylamide green-sensitive photopolymer. By optimizing the pre-illumination parameters such as pre-illumination energy density and pre-illumination delay time, the photosensitivity and diffraction efficiency of photopolymer under pulsed holographic recording are improved effectively. For the coherent pre-illumination energy density of 2mJ/cm2, total pre-illumination energy of 50mJ/cm2, the diffraction efficiency of 85% can be obtained with holographic exposure of 35mJ/cm2. For the coherent pre-illumination delay time of 20seconds, the diffraction efficiency of 60% is obtained with holographic exposure of 17.5mJ/cm2. The photosensitivity is successfully improved about 8 times compared with other reported results, it has good application prospects in the measurements of high-speed transient processes.

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