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Chinese Physics B 2011年第11期20卷 323-331页

作者：于丹王珩刘鸿鹏王健姜永远孙秀冬 Department of Physics Harbin Institute of Technology College of Science Civil Aviation University of China

In this paper, we experimentally investigate the dark diffusional enhancement of the optimized multiplexed grating in the phenanthrenequinone doped poly （methyl methacrylate）（PQ-PMMA） photopolymer. The possibility of improving the holographic characteristics of the material through the dark enhancement is demonstrated. The optimal preillumination exposure and the optimal time interval between exposures are extracted to obtain the optimized diffraction efficiency, and their values are 3.4×103 mJ/cm2 and 2 min, respectively. The dark enhancement of the multiplexed grating is presented as an effective method to improve the response region and the dynamic range and to prevent saturation of the material. The dependence of the phenanthrenequinone concentration on the increment of the refractive index modulation is quantitatively studied, which provides a significant basis for improving the homogeneity in the multiplexed gratings using a quantitative strategy. Finally, a simple experimental procedure using the dark enhancement is introduced to improve the homogeneity of the diffraction efficiency and to avoid the complex schedule exposure.

关键词： photopolymer holographic multiplexing dark diffusional enhancement

Compact 2×2 parabolic multimode interference thermo–optic switches based on fluorinated photopolymer

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Chinese Physics B 2019年第4期28卷 216-223页

作者： Ji-Hou Wang Chang-Ming Chen Ke-Wei Hu Ru Cheng Chun-Xue Wang Yun-Ji Yi Xiao-Qiang Sun Fei Wang Zhi-Yong Li Da-Ming Zhang State Key Laboratory of Integrated Optoelectronics College of Electronic Science and Engineering Jilin University State Key Laboratory of Integrated Optoelectronics Institute of Electronic Semiconductors Chinese Academy of Sciences

In this work, a dual-side parabolic structural(DSPS) multimode interference(MMI) thermo–optic(TO) waveguide switch is designed and fabricated by using novel low-loss fluorinated photopolymer materials. Comparing with the traditional dual-side linear structural(DSLS) MMI device, the effective length of the MMI coupling region proposed can be effectively reduced by 40%. The thermal stability of the waveguide material is analyzed, and the optical characteristics of the switching chip are simulated. The actual performances of the entire MMI switch are measured with an insertion loss of7 dB, switching power of 15 m W and an extinction ratio of 28 dB. In contrast to the traditional MMI optical switch, the new type of parabolic structural MMI TO waveguide switch exhibits lower power consumption and larger extinction ratio. The compact fluorinated polymer MMI TO switches are suitable well for realizing miniaturization, high-properties, and lower cost of photonic integrated circuits.

关键词： fluorinated photopolymer materials parabolic structural MMI thermo–optic waveguide switches

CURING PROCESS OF photopolymer RESIN BOND DIAMOND TOOLS

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Chinese Journal of Mechanical Engineering 2007年第3期20卷 6-8页

作者： GAO Tao PENG Wei YAO Chunyan Ministry of Education Key Laboratory of Mechanical ManufactureZhejiang University of Technology Hangzhou 310014 China

Analytical simulation and corresponding proof-test are adopted to study the principle of the curing process of photopolymer resin diamond tools. The influence of the diamond as abrasives in photopolymer resin owing to the absorptivity of the diamond for the UV light on the photopolymer resin curing process is discussed. Based on the above, a kind of diamond tool—dicing blade is selected to analyze the curing process of photopolymer bond diamond tools. An analytical model of curing process is developed and a correlation curve between the depth of polymerization of the photopolymer resin diamond tools and the exposure time to represent the curing process of photopolymer bond dicing blade. A test is done to proof-test the validity of the analytical model and the correlation curve. The simulated data fit the experimental results, which demonstrates the analytical models and numerical algorithm are of high reliability. The analytical simulation method could possibly be used to optimize the curing cycle and improve the quality of the photopolymers resin bond diamond tools.

关键词： photopolymer Curing process Simulation Diamond tools

Holographic　grating　formation　in　dry　photopolymer　film　with　shrinkage

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Chinese Physics B 2004年第9期13卷 1428-1431页

作者：骆守俊刘国栋何庆声邬敏贤金国藩施盟泉王涛吴飞鹏 StateKeyLaboratoryofPrecisionMeasurementTechnologyandInstruments TsinghuaUniversityBeijing100084China TechnicalInstituteofPhysicsandChemistry ChineseAcademyofSciencesBeijing100101China

An important issue in developing applications for photopolymers in holography is the effect of shrinkage on recording properties. In this paper, we introduce a model to describe real-time formation of a single grating in photopolymers at any geometrical angle, under the assumption that the shrinkage is in proportion to the polymerization. This model combines polymerization kinetics with the coupled-wave theory, explaining the shrinkage effect on the diffraction efficiency. The model is validated by comparing its predictions with the experimental results for a film of 99μm thickness.

关键词： photopolymer holographic grating shrinkage

Properties of Volume Holograms Recording in photopolymer Films with Various Pulse Exposures Repetition Frequencies

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Properties of Volume Holograms Recording in Photopolymer Fil...

Holographic property of photopolymers with different amine photoinitiators

Photonics Asia 2004:Information Processing and Data Storage

作者： He Qingsheng Wei Haoyun* He Shurong Jin Guofan Wu Minxian State Key Laboratory of Precision Measurement Technology and Instruments Dept. of Precision Instruments Tsinghua Univ. Beijing 100084 P. R. China

In this paper, the influence of the pulse exposures repetition frequencies on volume holograms recording in photopolymer films is studied. Using a pulsed diode-pumped YAG laser (532-nm wavelength) as

关键词： volume holograms repetition frequency pulse exposure photopolymer

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Chinese Physics B 2010年第2期19卷 318-324页

作者：路海李若平孙彩霞肖勇唐道广黄明举 Institute of Optics&Optoelectronics Technique and School of Physics and Electronics Henan University

Holographic parameters and photobleaching kinetics of the photopolymers with five different amine photoinitiators are studied. The maximum values of diffraction efficiency, photobleaching coefficient and quantum yield follow the sequence： Triethanolamine （TEA）〉 Diethanolamine （DEA）〉 Ethanolamine （EA）〉 Triethylamine （TETN）〉 Diethylamine （DETN）. The holographic capabilities of photopolymer performances are determined by the number of functional groups in the amine molecular structure. There is an optimum proportion of the photoinitiator, the photosensitizer and the monomer in the test of holographic parameters with different amine concentrations. The maximum diffraction efficiency is 59.26／%, sensitivity is 1.72／times 10^{ - 3}~cm^{2}/mJ, and the maximum refractive modulation index is 4.64／times 10^{ - 4}.

关键词： photopolymer amine holographic recording photoinitiator

A new photopolymerizable holographic recording material based on acrylamide and N-hydroxymethyl acrylamide

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Chinese Physics B 2005年第10期14卷 2004-2008页

作者：弓巧侠王素莲黄明举干福熹 Shanghai Institute of Optics and Fine Mechanics Chinese Academy of Sciences Shanghai 201800 China School of Physics and Information Optoelectronics Henan University Kaifeng 475000 China

A new polyvinylalcohol-based photopolymeric holographic recording material has been developed. The recording is obtained by the copolymerization of acrylamide and N-hydroxymethyl acrylamide. Diffraction efficiencies near 50% are obtained with energetic exposure of 80mJ/cm^2. N-hydroxymethyl acrylamide can improve the optical quality of the film. With the increase of the concentration of N-hydroxymethyl acrylamide, the flatness of the film increases, scattering reduces and the straight image is clearer with a small distortion. The postexposure effect on the grating is also studied. The diffraction efficiency of grating increases further during postexposure, gradient of monomer exists after exposure.

关键词： photopolymer holographic storage sensitivity diffraction efficiency

一种改进的红敏光致聚合物-明胶(PPG)全息记录材料的研究

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四川大学学报(自然科学版) 2001年第5期38卷 773-775页

作者：冯立金永东夏传琴蓝福正王科太四川大学化学学院四川大学化学学院成都610064

A high performance red sensitive photopolymer holographic recording material is *** acrylic acid is added into PPG system,the holograms of high diffraction efficiency,which is stable in high humidty environment for a ... 详细信息

关键词： photopolymer holograhphic recording material envionmental stability diffraction efficiency

STUDY OF DYE-SENSITIZED SYSTEMS FOR PHOTOIMAGING

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Chinese Journal of Polymer Science 2001年第1期19卷 79-83页

作者： Fang Gao Chun-ying Zhao Yong-yuan Yang Li-dong Li Insatute of Photographic Chemistry Chinese Academy of Sciences Beijing 100101 China Insatute of Photographic Chemistry Chinese Academy of Sciences Beijing 100101 China Insatute of Photographic Chemistry Chinese Academy of Sciences Beijing 100101 China Insatute of Photographic Chemistry Chinese Academy of Sciences Beijing 100101 China

o-Chloro-hexaarylbiimidazole (o-CI-HABI) can be sensitized efficiently by cyanine dyes, the cyclopentanone and cyclohexanone dyes, when exposed to xenon lamp (use filter cut lambda less than or equal to 400 nm). The photoreaction between the photoinitiator and the dyes was completed through an electron transfer process. Excellent results have been obtained in photoimaging studies, e.g. the resolution of the image can reach 7 mum. The influence of the content of the dyes and the heat after the exposure on the resolution of the image was investigated.

关键词： photopolymer photoimaging hexaarylbiimidazole printing plate

Recent advances in holographic data storage

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Frontiers of Optoelectronics 2014年第4期7卷 450-466页

作者： Hao RUAN Research Laboratory for High Density Optical Storage Shanghai Institute of Optics and Fine Mechanics Chinese Academy of Sciences Shanghai 201800 China

Nowadays, big-data centers still rely on hard drives. However, there is strong evidence that these surface-storage technologies are approaching fundamental limits that may be difficult to overcome, as ever-smaller bits become less thermally stable and harder to access. An intriguing approach for next generation data-storage is to use light to store information throughout the three- dimensional （3D） volume of a material. Holographic data storage （HDS） is poised to change the way we write and retrieve data forever. After many years of developing appropriate recording media and optical read-write architectures, this promising technology is now moving industriously to the market. In this paper, a review of the major achievements of HDS in the past ten years is presented and the key technique details are discussed. The author concludes that HDS technology is an attractive candidate for big data centers in the future. On the other hand, there are many challenges ahead for HDS technology to overcome in the years to come.

关键词： holographic data storage (HDS) microholo-graphy photopolymer channel code signal detection big data center