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STUDY ON THE MODIFICATION OF POLY (METHYL METHACRYLATE) TRANSPARENT MATERIAL
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作者 张雪馨 洪怀懋 李卓美 《Chinese Journal of Polymer Science》 SCIE CAS CSCD 1992年第1期1-7,共7页
A kind of transparent plastic material has been prepared with bulk copolymer of MMA-MA containing MA 20 vol% as matrix modified by introducing EtOH during bulk copolymerization to increase the transparency and by copo... A kind of transparent plastic material has been prepared with bulk copolymer of MMA-MA containing MA 20 vol% as matrix modified by introducing EtOH during bulk copolymerization to increase the transparency and by copolymerizing together with metallic salts of MA forming ionomer polymer to improve the heat-tolerance and hardness. The effect of the contents of the additives on the heat stability, hardness and transparency of the copolymer has been studied. The optical homogeneity of the copolymer material has also been examined. It has been found that the specific property of transparent material of this kind may be obtained by controlling the amounts of EtOH and metallic salt of MA. 展开更多
关键词 Modified PMMA MMA-MA copolymer transparent material
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Enhanced light extraction of GaN-based light-emitting diodes with periodic textured SiO_2 on Al-doped ZnO transparent conductive layer 被引量:3
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作者 招瑜 范冰丰 +4 位作者 陈义廷 卓毅 庞洲骏 刘振 王钢 《Chinese Physics B》 SCIE EI CAS CSCD 2016年第7期553-556,共4页
We report an effective enhancement in light extraction of Ga N-based light-emitting diodes(LEDs) with an Al-doped Zn O(AZO) transparent conductive layer by incorporating a top regular textured SiO2 layer. The 2 in... We report an effective enhancement in light extraction of Ga N-based light-emitting diodes(LEDs) with an Al-doped Zn O(AZO) transparent conductive layer by incorporating a top regular textured SiO2 layer. The 2 inch transparent throughpore anodic aluminum oxide(AAO) membrane was fabricated and used as the etching mask. The periodic pore with a pitch of about 410 nm was successfully transferred to the surface of the SiO2 layer without any etching damages to the AZO layer and the electrodes. The light output power was enhanced by 19% at 20 m A and 56% at 100 m A compared to that of the planar LEDs without a patterned surface. This approach offers a technique to fabricate a low-cost and large-area regular pattern on the LED chip for achieving enhanced light extraction without an obvious increase of the forward voltage. 展开更多
关键词 light-emitting diodes III–V material transparent conductive layer anodic aluminum oxide
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NONLINEAR OPTICAL PROPERTIES OF A-SHAPED NITROPYRIMIDINE DERIVATIVES AND ITS POLYMERIC FILMS 被引量:2
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作者 相莹许 叶成 《Chinese Journal of Polymer Science》 SCIE CAS CSCD 1996年第4期362-367,共6页
Three A-shaped nitropyrimidine derivatives with benzyl or furfuryl as bridge havebeen synthesized. They possess shorter absorption wavelengths (λ_(cut-off))<400 nm) andhigher βμ values (around 10^(-46) esu). The... Three A-shaped nitropyrimidine derivatives with benzyl or furfuryl as bridge havebeen synthesized. They possess shorter absorption wavelengths (λ_(cut-off))<400 nm) andhigher βμ values (around 10^(-46) esu). The second order nonlinear optical coefficient d_(33) ofpoled BNPMOPMDA/PMMA doped film is 1.2-2.0×10^(-9) esu obtained by in-situ SHGmeasurements. It can be expected that the chromophore-functionalized polymer containinghigher number density of synthesized chromophore as side chain will be the potential blue-light transparent frequency doubling materials. 展开更多
关键词 Blue-light transparent materials A-shaped compounds Nitropyrimidine derivatives Second harmonic generation Poled polymer
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Thermal Stress-Induced Birefringence in Borate Glass Irradiated by Femtosecond Laser Pulses 被引量:1
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作者 戴晔 余昺鲲 +4 位作者 鲁波 邱建荣 阎晓娜 姜雄伟 朱从善 《Chinese Physics Letters》 SCIE CAS CSCD 2005年第10期2626-2629,共4页
Thermal stress-induced birefringence in borate glass which has been irradiated by 800-nm femtosecond laser pulses is observed under cross-polarized light. Due to the high temperature and pressure formed in the focal v... Thermal stress-induced birefringence in borate glass which has been irradiated by 800-nm femtosecond laser pulses is observed under cross-polarized light. Due to the high temperature and pressure formed in the focal volume, the material at the edge of the micro-modified region is compressed between the expanding region and the unheated one, then stress emerges. Raman spectroscopy is used to investigate the stress distribution in the micro-modified region and indicates the redistributions of density and refractive index by Raman peak shift. We suggest that this technique can develop waveguide polarizers and Fresnel zone plates in integrated optics. 展开更多
关键词 WRITTEN WAVE-GUIDES transparent materialS FUSED-SILICA
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Structural Change in Au^3+-Doped BK7 Glass Irradiated by Femtosecond Laser
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作者 丁婷 王丽 +2 位作者 周时凤 鲍家兴 邱建荣 《Chinese Physics Letters》 SCIE CAS CSCD 2007年第5期1372-1375,共4页
We report on structural change in an Au^3+-doped BK7 glass irradiated by an infrared femtosecond laser at 800 nm. A grating structure is inscribed in the glass sample. The glass sample is then annealed at various tem... We report on structural change in an Au^3+-doped BK7 glass irradiated by an infrared femtosecond laser at 800 nm. A grating structure is inscribed in the glass sample. The glass sample is then annealed at various temperatures. Structural change of the grating is observed by an optical microscope. Absorption spectra indicate that colour centres are induced after the laser irradiation, and they decrease with increasing annealing temperature. Au nanoparticles are precipitated at high temperatures (≥ 600℃). The mechanisms of the phenomena are discussed. 展开更多
关键词 SODA-LIME GLASS transparent materialS PULSES FABRICATION NANOPARTICLES
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Self-Assembled Quasi-Periodic Voids in Glass Induced by a Tightly Focused Femtosecond Laser
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作者 戴晔 胡晓 +2 位作者 宋娟 余禺鲲 邱建荣 《Chinese Physics Letters》 SCIE CAS CSCD 2007年第7期1941-1944,共4页
Multiple refocusing of a tightly focused femtosecond laser due to the dynamic transformation between self-focusing and self-defocusing is employed to provide a novel method to produce quasi-periodic voids in glass. It... Multiple refocusing of a tightly focused femtosecond laser due to the dynamic transformation between self-focusing and self-defocusing is employed to provide a novel method to produce quasi-periodic voids in glass. It is found that the diameter or the interval of the periodic voids increases with the increasing pulse energy of the laser. The detailed course for producing periodic voids is discussed by analysing the damaged track induced by the tightly focused femtosecond laser pulses. It is suggested that this periodic structure has potential applications in fabrication of three-dimensional optical devices. 展开更多
关键词 transparent materialS FUSED-SILICA FABRICATION PULSE
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Solidification researches using transparent model materials——A review 被引量:3
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作者 HUANG WeiDong WANG LiLin 《Science China(Technological Sciences)》 SCIE EI CAS 2012年第2期377-386,共10页
A review is given in the paper for solidification researches with transparent model materials. The effective experimental me- thod was first proposed by Jackson and Hunt in 1965. The transparent model materials for so... A review is given in the paper for solidification researches with transparent model materials. The effective experimental me- thod was first proposed by Jackson and Hunt in 1965. The transparent model materials for solidification researches are a kind of non-faceted crystals known as "plastic crystals" or "globular molecules", which have very low entropy of melting as that of metals. According to Jackson's theory proposed in 1958, entropy of phase transformation will determine whether the phase interface morphology is smooth or rough in atomic scale, which will lead to faceted or nonfacted phase interface in mi- croscopic and macroscopic scales. Succinonitrile (SCN) and its alloys with water, ethanol, acetone, and NH4C1-H:O solution are most commonly used as transparent model materials for solidification researches of dendritic growth, anisotropy of solid-liquid interfacial energy, crystal nucleation, crystal grain formation, directional solidification, eutectic and peritectic so- lidification, solidification defects formation such as bubble, hot tearing, etc. Among these researches, the most impressive work was the critical test of dendritic growth theories with high purity succinonitrile by Glicksman et al., which gave positive answer to the Ivantsov's analysis and negative answer to the ad hoc condition of the maximum velocity hypothesis. The future researches with transparent model materials could be suggested in three aspects: 1) accurate measurement of material proper- ties and alloy phase diagrams in more plastic crystals, especially to find more transparent eutectic and peritectic alloys; 2) accurate measurement of the grain boundary groove shape to obtain precise data of the anisotropy parameters of the interfacial free energy in transparent model materials; 3) to get clear pictures of solidification processes with morphology details in a rela- tively large area, with continuous movement of liquid and particles, in order to give experimental support to numerical simula- tions aimming at accurate description of microstructure formation during solidification of multicomponent alloys under complex conditions of real casting and welding processes. 展开更多
关键词 transparent model materials SOLIDIFICATION plastic crystal dendritic growth
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Preparation of (Tb_(0.8)Y_(0.2))_3Al_5O_(12)transparent ceramic as novel magneto-optical isolator material 被引量:2
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作者 陈冲 倪屹 +2 位作者 周圣明 林辉 易学专 《Chinese Optics Letters》 SCIE EI CAS CSCD 2013年第2期65-67,共3页
The ion substitution characteristics of Y3+-doped (Tb0.sY0.2)3A15012 transparent ceramics synthesized by a solid-state reaction and vacuum sintering are investigated. The sample sintered at 1 680℃ exhibits the bes... The ion substitution characteristics of Y3+-doped (Tb0.sY0.2)3A15012 transparent ceramics synthesized by a solid-state reaction and vacuum sintering are investigated. The sample sintered at 1 680℃ exhibits the best optical properties, yielding a transmittance 〉75% from 900 to 1 600 nm. The Verdet constant of this sample at 632.8 nm is -108.79 rad.T-l.m-1. X-ray diffraction (XRD) results show that all of the samples have a pure garnet crystal structure without secondary phases. The microstructure of the samples reveals homogeneous grain sizes that averages 〈10μm. 展开更多
关键词 Preparation of Al TB transparent ceramic as novel magneto-optical isolator material
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