Utilization of an LCoS spatial light modulator's phase flicker for improving diffractive efficiency

2010 ◽  
Author(s):  
Karol Kakarenko ◽  
Marcin Zaremba ◽  
Izabela Ducin ◽  
Michał Makowski ◽  
Agnieszka Siemion ◽  
...  
Keyword(s):  
Diffractive Efficiency

Diffractive efficiency improvement of diffractive cylinder lenses by Gaussian-beam illumination

1997 ◽  
Vol 1 (8) ◽  
pp. 234 ◽  
Author(s):  
Felix Fuerer ◽  
Martin Schmidt ◽  
Olof Bryngdahl
Keyword(s):  
Gaussian Beam ◽  
Efficiency Improvement ◽  
Diffractive Efficiency

scholarly journals Utilization of the phase flicker of a LCoS Spatial Light Modulator for improved diffractive efficiency

2010 ◽  
Vol 2 (3) ◽  
Author(s):  
Michał Makowski ◽  
Karol Kakarenko ◽  
Marcin Zaremba ◽  
Izabela Ducin ◽  
Agnieszka Siemion ◽  
...  
Keyword(s):  
Spatial Light Modulator ◽  
Light Modulator ◽  
Diffractive Efficiency

Multilayer Diffraction Element with Wide Field of View and High Diffractive Efficiency

2012 ◽  
Vol 39 (5) ◽  
pp. 0516001 ◽  
Author(s):  
范长江 Fan Changjiang ◽  
赵亚辉 Zhao Yahui ◽  
应朝福 Ying Chaofu ◽  
吴浩伟 Wu Haowei
Keyword(s):  
Field Of View ◽  
Wide Field ◽  
Wide Field Of View ◽  
Diffractive Efficiency

Effect of Solvent, Hydrogen Bonding, and thickness of Azopolymer Films on Surface Relief Grating

2005 ◽  
Vol 889 ◽  
Author(s):  
Woo-Hyuk Jung ◽  
Dong-Yu Kim ◽  
Jayant Kumar ◽  
Stephen P. McCarthy
Keyword(s):  
Hydrogen Bonding ◽  
Surface Relief ◽  
Laser Intensity ◽  
Diglycidyl Ether ◽  
Hydroxyl Groups ◽  
Coupling Reactions ◽  
Azo Coupling ◽  
Effect Of Solvent ◽  
Diffractive Efficiency ◽  
Surface Relief Gratings

ABSTRACTEpoxy-based copolymers were synthesized with N,N-diglycidyl aniline (DGA) and aniline (An), called poly(DGA-co-An), where azo coupling reactions were performed using amino benzonitrile (ABN) and nitro aniline (NA). Two azopolymers were dissolved with both tetrahydrofuran (THF)/dioxane complex solvent and THF to compare the diffraction efficiencies according to solvent. The thin films spin-cast with THF/dioxane showed the better diffractive efficiency than with THF due to the high boil point of the residual dioxane. The azopolymers of two azo bonds were spin-coated at 800 and 1300 rpm where the thicker film showed the better diffractive efficiency. The epoxy-based copolymers synthesized with diglycidyl ether of bisphenol A (DGEBA) and aniline (An) or 3-hydroxyl aniline (HAn) were coupled with hydroxyl nitro amino benzene (HNAB). Hydroxyl groups in chromophores helped to form hydrogen bonding with the nitrogen atoms in the azo bonds and prevented photoisomerization, showing no surface relief gratings under a normal laser intensity of 100 mW/cm2. Polyurethane-based azopolymers were synthesized with disperse orange 17 (DO17) and toluene-2,4-diisocyanate (TDI), which were no hydroxide groups in the main chains, and showed the better diffractive efficiency than the epoxy-based azopolymers with nitro substituents.

SELF-ASSEMBLED VOLUME GRATING IN SILICA GLASS INDUCED BY TIGHTLY FOCUSED FEMTOSECOND LASER PULSE

2009 ◽  
Vol 18 (04) ◽  
pp. 625-632
Author(s):  
ZHONGYI GUO ◽  
WEIQIANG DING ◽  
SHILIANG QU ◽  
JINGMIN DAI ◽  
SHUTIAN LIU
Keyword(s):  
Laser Pulse ◽  
Femtosecond Laser ◽  
Femtosecond Laser Pulse ◽  
Silica Glass ◽  
Femtosecond Pulses ◽  
Scanning Velocity ◽  
First Order ◽  
Diffractive Efficiency ◽  
Transparent Materials ◽  
Self Assembled

We report on self-assembled volume grating in silica glass induced by a tightly focused femtosecond laser pulse. The formation of volume grating is attributed to the multiple microexplosion in the transparent materials induced by the femtosecond pulses. The first order diffractive efficiency is greatly dependent on the energy of the pulses and the scanning velocity of the laser, and the highest reaches to nearly 30%.

Calculation of the X-Ray Holographic Lens for the Nanometric Range of Spectrum

2009 ◽  
Vol 4 (2) ◽  
pp. 3-7
Author(s):  
Yuriy Batomunkuev ◽  
Nikolay Mescheryakov
Keyword(s):  
Spherical Aberration ◽  
X Ray ◽  
Nanometric Range ◽  
Seventh Order ◽  
Diffractive Efficiency ◽  
Fifth Order ◽  
Holographic Lens ◽  
Coherent Source

Calculation of x-ray holographic lenses with corrective spherical aberration of the seventh order for working wavelength 2,4 nm, 4,5 nm and 13,5 nm is executed in article. The radius of surfaces of holographic lenses is determined from condition of maximum of diffractive efficiency. It is shown that consideration of shrinkage of thickness of the holographic lenses allows to correct the spherical aberration of the fifth order. It is obtained that holographic lenses with greatly different working wavelengths can be recorded on one scheme by choice of optimum of wavelength of coherent source. The relative diameters of the obtained holographic lenses are 1:1,1, 1:1 and 1:0,9.

Diffractive efficiency of terahertz zone plates with continuous phase

2010 ◽  
Author(s):  
Dehua Li ◽  
Yang Zhao ◽  
Qingzhen Sun ◽  
Xiangdong Zhao ◽  
Wei Zhou ◽  
...  
Keyword(s):  
Continuous Phase ◽  
Zone Plates ◽  
Diffractive Efficiency

scholarly journals Diffractive Efficiency Optimization in Metasurface Design via Electromagnetic Coupling Compensation

Materials ◽  
2019 ◽  
Vol 12 (7) ◽  
pp. 1005 ◽  
Author(s):  
Yang Li ◽  
Minghui Hong
Keyword(s):  
Electric Fields ◽  
Electric Field Intensity ◽  
Electromagnetic Coupling ◽  
Optical Component ◽  
Computational Method ◽  
Optical Elements ◽  
Swarm Optimization ◽  
Efficiency Optimization ◽  
Diffractive Efficiency

Metasurface is an advanced flat optical component that can flexibly manipulate the electromagnetic wave in an ultrathin dimension. However, electromagnetic coupling among neighbored optical elements decreases the diffractive efficiency and increases the noise. In this paper, a novel computational method is proposed to optimize the coupling of the metasurface. The coupled electric fields in metasurface design are decomposed into various coupling orders and then restructured to replace the whole metasurface simulation. This method is applied to optimize a metasurface that consisted of conventional nanorod plasmonic antennas as a case study. The convergence of this method in calculation is demonstrated. The electric field intensity deviation of a nanoantenna array can be reduced from 112.2% to 0.5% by the second-order coupling correction. The diffractive efficiency of a three-level phase meta-deflector is optimized from 73% to 86% by optimized coupling compensation via particle swarm optimization (PSO). This process opens a new area of metasurface design by the detailed field distribution of optical elements.

scholarly journals A theoretical framework for general design of two-materials composed diffractive fresnel lens

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Ming-Yen Lin ◽  
Chih-Hao Chuang ◽  
Tzu-An Chou ◽  
Chien-Yu Chen
Keyword(s):  
Optical Materials ◽  
Diffraction Theory ◽  
Fresnel Lens ◽  
Theoretical Framework ◽  
Diffractive Optical Elements ◽  
Optical Elements ◽  
General Design ◽  
Diffractive Efficiency ◽  
The Relationship ◽  
Partial Dispersion

AbstractNear 100% of diffractive efficiency for diffractive optical elements (DOEs) is one of the most required optical performances in broadband imaging applications. Of all flat DOEs, none seems to interest researchers as much as Two-Materials Composed Diffractive Fresnel Lens (TM-DFL) among the most promising flat DOEs. An approach of the near 100% of diffractive efficiency for TM-DFL once developed to determine the design rules mainly takes the advantage of numerical computation by methods of mapping and fitting. Despite a curved line of near 100% of diffractive efficiency can be generated in the Abbe and partial dispersion diagram, it is not able to analytically elaborate the relationship between two optical materials that compose the TM-DFL. Here, we present a theoretical framework, based on the fundaments of Cauchy's equation, Abbe number, partial dispersion, and the diffraction theory of Fresnel lens, for obtaining a general design formalism, so to perform the perfect material matching between two different optical materials for achieving the near 100% of diffractive efficiency for TM-DFL in the broadband imaging applications.

Laser Power Characterization Method for Fabrication of Centrosymmetric CR-DOEs Mask

2008 ◽  
Vol 53-54 ◽  
pp. 337-342
Author(s):  
Duo Shu Wang ◽  
Chong Tai Luo ◽  
Tao Chen ◽  
Yu Qing Xiong ◽  
Hong Kai Liu ◽  
...  
Keyword(s):  
Laser Power ◽  
Low Cost ◽  
Chromatic Aberration ◽  
Diffractive Optical Elements ◽  
Direct Writing ◽  
Laser Direct Writing ◽  
Optical Elements ◽  
Short Period ◽  
Diffractive Efficiency ◽  
Mask Fabrication

With high diffractive efficiency, Continuous Relief Diffractive Optical Elements (CR-DOE) can be used to eliminate chromatic aberration, partial aberration and simplify optical system. The technology for CR-DOE with Laser Direct Writing method has advantages of simple process, short period and low cost. The paper studied on the characterization method of laser power for the technology. The principle of mask fabrication of CR-DOE by Laser Direct Writing is described in the paper. The relations between microstructure depth and laser power, exposing position radius and laser power were studied. The results showed that microstructure depth changes in direct ratio to laser power and laser power should change in direct to exposing position radius while several same depth microstructures were fabricated at different radius. At the end, the paper gave the charactering method and also fabricated the mask of a kind of centrosymmetric continuous relief diffractive focus lens with the method.

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