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| 1 | NONLINEAR OPTICAL PROPERTIES OF A-SHAPED NITROPYRIMIDINE DERIVATIVES AND ITS POLYMERIC FILMS显示文摘Three A-shaped nitropyrimidine derivatives with benzyl or furfuryl as bridge havebeen synthesized. They possess shorter absorption wavelengths (λcut-off)<400 nm) andhigher βμ values (around 10-46 esu). The second order nonlinear optical coefficient d33 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. | 相莹许 叶成 | 1996 | Chinese Journal of Polymer Science1996，14，4： | 2 |
| 2 | Dielectric behavior of poled complex perovskite relaxor ferroelectrics显示文摘RELAXOR ferroelectric ceramics with complex perovskite structure is considered as the first material chosen for multilayer capacitors (MLC) in technology and economy, because of their high permittivity, lower sintering temperature and lower capacitors changing rate with temperature (temperature coefficient) for diffuse phase transition (DPT). Thus, preparations and properties about the materials received more attention. There are many reports about their dielectric properties but there are few about their poled dielectric behavior. In the | FAN Huiqing, XU Zhuo, ZHANG Liangying and YAO XiElectronic Materials Research Laboratory, Xi’an Jiaotong University, Xi’an 710049, China | 1997 | Chinese Science Bulletin1997，42，2： | 1 |
| 3 | Mid-infrared laser with 1.2 W output power based on PPLT显示文摘The optical parametric oscillator (OPO) based on the periodically poled lithium tantalate (PPLT) crystal (40 mm×5 mm×1 mm) is fabricated. The OPO is pumped by a Q-switched Nd:YAG laser working at 1.064 μm. An average idler output power (around 3.8 μm) of 1.2 W and signal output power (around 1.48 μm) of 3 W are obtained when the pump power is 20 W. | Lü XinJie, ZHAO Gang, LI GuiJun, GAO ZhiDa, PAN ShuDi & ZHU ShiNing National Laboratory of Solid State Microstructure, Nanjing University, Nanjing 210093, China | 2010 | Science China(Physics,Mechanics & Astronomy)2010，53，4： | 1 |
| 4 | Investigation of Domain Wall Velocity to External Fields for High-Quality Waveguide-Type Periodically Poled LiNbO3 Fabrication显示文摘The Ti-doped waveguide-type periodically poled LiNbO3 (PPLN) were fabricated and the dependence of domain wall velocity on an external field applied for domain inversion was investigated. The whole polarization reversal process was computer-controlled to regulate domain wall expansion at a feedback time shorter than 5 μs. The coercive voltage and several values of excess voltage were applied on 500 μm-thick wafers serially connected to a 1-MOhm external resistor which had an effect of the poling current reduction, i.e. the deceleration of domain wall expansion. The domain wall velocity is sensitive to the poling voltage, precisely speaking, to the excess voltage. The domain wall velocities were 28.70, 16.02 and 5.75 μm·s-1 under poling field of 23.5, 22.0 and 21.0 kV·mm-1, respectively. Moreover, average duty cycle of PPLN is about 49.93%. | Soo Woo Kwon Woo Seok Yang H M Lee Woo Kyung Kim Hang Yong Lee Dae Ho Yoon Yo Seung Song | 2006 | Journal of Rare Earths2006，24，z1： | 0 |
| 5 | THE SYNTHESIS OF NEW POLED CROSSLINKED POLYMETHACRYLATES AND THEIR SECOND ORDER NONLINEAR OPTICAL PROPERTIES显示文摘Films were prepared from mixtures of copolymers of 4-nitro-4’- [N- methylacryloyloxyethyl,N’-ethyl] amino azobenzene with glycidyl methacrylate (chromophore content: 6 mol%) andcopolymers containing anhydride units, which was obtained by the reaction of 4-nitro-4’-[N-hydroxyethyl, N’-ethyl] amino azobenzene with polymethacryloyl chloride (chromophorecontent: 25 mol %). During thermal poling process the anhydride reacts with the epoxygroup and the resulting crosslinked network structure will stabilize the second harmonicgeneration in the poled film. The second harmonic generation of the poled film shows amaximum with the variation of composition, this is presumed to be due to the effects of theincreasing of concentration, orientation order as well as orientation stability of chromophoregroups during crosslinking. | 颜星中 陈用烈 梁兆熙 蔡志岗 杨佩青 罗挺 | 1996 | Chinese Journal of Polymer Science1996，14，4： | 0 |
| 6 | Nonlinear optical polyimide with high thermal stability prepared by simultaneous poling and polymerization显示文摘The high Tg polyimide embedded with a novel imidazol-typed chromophore 2-[5-(4-nitrostilbenyl)thienyl]-4,S-di(4-aniinophenyl)imidazole (NSTDAPI) was prepared using the 'simultaneous poling and polymerization' technique. The glass transition temperature (Fg) is 304℃ and the initial decomposition temperature (Td) is 330℃. The in-situ second harmonic generation (in-situ SHG) measurement was performed to study its poling behavior and the stability of the poling-induced orientation. The nonlinear optical (NLO) coefficient d33 of poled polyimide film is 32.2 pm/V at 1064 nm fundamental wavelength. The SHG signal of the poled polymer film was quite stable below 200℃, and then began to decay rapidly above 220℃. The half-decay temperature of dipole orientation for the film is 250℃. | Hu Kang Wei Wu Peiji Wu Cheng Ye | 2001 | Chinese Science Bulletin2001，46，10： | 0 |
| 7 | Molecular design of new chromophores for high performance poled polymers | 王鹏 朱培旺 吴伟 叶成 | 2000 | Progress in Natural Science:Materials International2000，10，4： | 0 |
| 8 | Tunable Second Harmonic Generation with High Conversion Efficiency in Periodically Poled Lithium Niobate Channel Waveguide显示文摘The experiment on quasi-phase-matched second harmonic generation (SHG) in a channel waveguide was reported. The waveguide was made by annealed proton exchange in the periodically poled lithium niobate (PPLN) with the period of PPLN of 14.9 μm, which was designed for cascading wavelength conversion in dense wavelength division multiplexer optical communications. The measurement results of SHG conversion efficiency as a function of fundamental wavelength at room temperature fit well to sinc^2 shape. The peak of SHG conversion efficiency was 75%·W~ -1 ·cm~ -2 as well as reported. The relationship between the center fundamental wavelength and temperature shows that SHG can be effectively tuned by the temperature in PPLN waveguide. | 徐荣辉 陈险峰 陈玉萍 叶志清 夏宇兴 | 2007 | Journal of Shanghai Jiaotong university(Science)2007，12，4： | 0 |
| 9 | Influence of side groups on second harmonic generation efficiency of poled polymer films显示文摘The molecules formed in a structure of A-π-D possess large hyperpolarizability β, in which A is an acceptor, D is a donor, and π is an electronic bridge connecting A and D. From such molecules one can make poled polymer films of large second-order | 蔡志岗 徐志凌 杨佩青 李鹏 李庆行 颜星中 梁兆熙 陈用列 | 1996 | Chinese Science Bulletin1996，41，13： | 0 |
| 10 | Study on thermal stability of poled non-linear optical polymers显示文摘A logarithmic expression is proposed to describe relaxation of the polar order in side chain polymers,together with a new way of plotting temperature dependent relaxation data.This results in a straight line extending even below the glass transition temperature in the case of poled nonlinear optics (NLO) side chain polymers.A simple procedure to determine the rotational diffusion constant Dr is given and Dr values of several polymer systems have been evaluated and compared with each other.It appears that,starting from the conventional and well known poled polymer system currently applied,a further lowering of Dr by about 3 orders of magnitude is necessary in order to reach an acceptable orientational stability or lifetime of poled polymers for practical applications.Attempts have been made to introduce electron push-pull substituents into high thermostable molecular frameworks and results of preliminary measurements are reported. | Mhlmann G.R. vanderVorst C.P.J.M. | 1996 | Chinese Journal of Chemistry1996，14，5： | 0 |
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