scholarly journals Optimization of the diffraction efficiency in photorefractive crystals

2017 ◽  
Vol 50 (2) ◽  
pp. 181-186
Author(s):  
A. L. Villamizar Amado ◽  
N. A. Arias Hernández ◽  
M. L. Molina Prado ◽  
M. Tebaldi
Keyword(s):  
Diffraction Efficiency ◽  
Photorefractive Crystals

Effect of applied fields on the Bragg condition and the diffraction efficiency in photorefractive crystals

1994 ◽  
Vol 19 (12) ◽  
pp. 910 ◽  
Author(s):  
Raymond De Vré ◽  
Muthu Jeganathan ◽  
Jeffrey P. Wilde ◽  
Lambertus Hesselink
Keyword(s):  
Diffraction Efficiency ◽  
Bragg Condition ◽  
Photorefractive Crystals ◽  
Applied Fields

Effect of light-induced scattering on diffraction efficiency in photorefractive crystals

1995 ◽  
Vol 4 (6) ◽  
pp. 420-427
Author(s):  
Zhou Zhong-xiang ◽  
Sun Wan-jun ◽  
Sun Xiu-dong ◽  
Zhao Hua ◽  
Xu Ke-bin ◽  
...  
Keyword(s):  
Diffraction Efficiency ◽  
Photorefractive Crystals ◽  
Effect Of Light

scholarly journals THE MAXIMUM DIFFRACTION EFFICIENCY FOR HOLOGRAPHIC STORAGE IN PHOTOREFRACTIVE CRYSTALS

1988 ◽  
Vol 37 (12) ◽  
pp. 2057
Author(s):  
YUE XUE-FENG ◽  
SHAO ZONG-SHU ◽  
CHEN HUAN-CHU ◽  
WANG YING-SU
Keyword(s):  
Diffraction Efficiency ◽  
Holographic Storage ◽  
Photorefractive Crystals

Self-Focusing in Pulsed and Continuous Regime in Photorefractive Crystals: KNbO 3 , LiNbO 3 , Sr x Ba 1 − x Nb 2 O 6

2003 ◽  
Vol 296 (1) ◽  
pp. 9-18
Author(s):  
C. Hesse ◽  
D. Wolfersberger ◽  
N. Fressengeas ◽  
G. Kugel
Keyword(s):  
Photorefractive Crystals ◽  
Self Focusing ◽  
Continuous Regime

scholarly journals Diffraction Efficiency Characteristics for MEMS-Based Phase-Only Spatial Light Modulator with Nonlinear Phase Distribution

Photonics ◽  
2021 ◽  
Vol 8 (3) ◽  
pp. 62
Author(s):  
Remington S. Ketchum ◽  
Pierre-Alexandre Blanche
Keyword(s):  
Diffraction Efficiency ◽  
High Speed ◽  
Phase Distribution ◽  
Complex Structure ◽  
Spatial Light Modulators ◽  
Light Modulator ◽  
Micro Electro Mechanical Systems ◽  
Light Modulators ◽  
Nonlinear Phase ◽  
Liquid Crystal On Silicon

Micro-electro mechanical systems (MEMS)-based phase-only spatial light modulators (PLMs) have the potential to overcome the limited speed of liquid crystal on silicon (LCoS) spatial light modulators (SLMs) and operate at speeds faster than 10 kHz. This expands the practicality of PLMs to several applications, including communications, sensing, and high-speed displays. The complex structure and fabrication requirements for large, 2D MEMS arrays with vertical actuation have kept MEMS-based PLMs out of the market in favor of LCoS SLMs. Recently, Texas Instruments has adapted its existing DMD technology for fabricating MEMS-based PLMs. Here, we characterize the diffraction efficiency for one of these PLMs and examine the effect of a nonlinear distribution of addressable phase states across a range of wavelengths and illumination angles.

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.

Relaxation Polarization Dependence of Circular Vector Gratings in Azobenzene Glassy Molecular Films

2020 ◽  
Vol 850 ◽  
pp. 285-290
Author(s):  
Andris Ozols ◽  
Peteris Augustovs ◽  
Kaspars Traskovskis ◽  
Valdis Kokars ◽  
Lauma Laipniece ◽  
...  
Keyword(s):  
Diffraction Efficiency ◽  
Relaxation Times ◽  
Grating Period ◽  
Volume Density ◽  
Laser Beams ◽  
Relaxation Polarization ◽  
Polarized Beam ◽  
Sandwich Type ◽  
Phd Thesis ◽  
532 Nm

Holographic grating recording and relaxation is studied in different azobenzene molecular glassy films by circularly orthogonally polarized 532 nm laser beams L and R. The readout was made by circularly polarized (R or L) 632.8 nm laser beam. Sandwich-type samples (glass-film-glass) were also studied. Maximum diffraction efficiency of 81% has been achieved in sandwich-type AR-173 film. The following relaxation features have been found: after reaching diffraction efficiency (DE) maximum no DE decay took place; DE read out by R-polarized beam was always higher than that by L-polarized beam; in sandwich-type samples DE decayed until zero when read out by R-polarization whereas DE was zero when read out by L-polarization. 50% relaxation times varied from 4 to 44 minutes, and they mainly decreased when grating period was increased. The observed relaxation peculiarities can be understood if one assumes that volume birefringence grating (VBG) is recorded followed by volume density grating (VDG) and surface relief grating (SRG) recording. R-polarization "feels" all gratings whereas L-polarization only VDG and SRG. At large exposures VDG and SRG dominate. These results confirm the conclusion made by J.Mikelsone in her 2018 PhD thesis that birefringence grating recording in azobenzene materials is a neccessary condition for SRG appearance.

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