2014
2014
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Record 373 of
Title:2.85 μm fluorescence of Ho-doped water-free fluorotellurite glasses
Author(s):He, Jianli(1,2); Zhou, Zhiguang(1); Zhan, Huan(1,2); Zhang, Aidong(1); Lin, Aoxiang(1)Source: Journal of Luminescence Volume: 145 Issue: DOI: 10.1016/j.jlumin.2013.08.020 Published: 2014Abstract:Holmium doped fluorotellurite glasses with composition of xHo 2O3 (wt%)+60TeO2-30ZnF2-10NaF (mol%) (xHo-TZNF60, x=0.50-1.50) were synthesized by physical and chemical dehydration technique (PCDH) and characterized as candidates of fiber laser glasses. Intense 2.85 μm fluorescence (Ho3+: 5I 6→5I7) was observed experimentally when excited at 1163 nm. It is attributed to low phonon energy of fluoride component and water-free characteristic (αOH=0.027 cm-1). Ho-TZNF glass possess a large simulated emission cross-section of 1.51×10-20 cm2, a long fluorescence lifetime of ~0.81 ms (1/e time of the initial part of non-exponential decay curve) and a broad transparent window of 2.1-4.2 μm. Among all the compositions of glass samples, 1.00Ho-TZNF60 is the optimized one, and thus is proposed to be the most potential material for 3.0 μm fiber laser. ? 2013 Elsevier B.V.Accession Number: 20133716735406 -
Record 374 of
Title:LED-based digital holographic microscopy with slightly off-axis interferometry
Author(s):Guo, Rongli(1,2); Yao, Baoli(1); Min, Junwei(1); Zhou, Meiling(1); Yu, Xianghua(1); Lei, Ming(1); Yan, Shaohui(1); Yang, Yanlong(1); Dan, Dan(1)Source: Journal of Optics (United Kingdom) Volume: 16 Issue: 12 DOI: 10.1088/2040-8978/16/12/125408 Published: December 1, 2014Abstract:An LED illuminated Linnik-type digital holographic microscope (DHM) for high-quality phase imaging is presented by the adoption of slightly off-axis two-step blind-phase-shifting interferometry (TB-PSI). Slightly off-axis interferometry lowers the requirement on the angle between the object and the reference waves as well as the requirement on the resolving power of the charge-coupled device (CCD) camera. In addition, the apparatus is cost-effective and offers ease of alignment. The phase-shifting DHM is simply implemented by mechanically moving the reference mirror while disposing of a precise phase modulator such as a piezoelectric transducer (PZT). The phase shift between the two interferograms is extracted by Fourier transformation analysis, and then the phase image is reconstructed. The performance of the TB-PSI used in the scheme is analyzed. The phase imaging for nanostructured specimens is conducted, and the results demonstrate the feasibility of the scheme. The phase noise is reduced by 73% when compared to the result obtained with coherent illumination. ? 2014 IOP Publishing Ltd.Accession Number: 20144900296628 -
Record 375 of
Title:Study of the guided mode confinement width of the surface plasmon polariton waveguides
Author(s):Rao, Ruijian(1,2)Source: Optoelectronic Devices and Integration, OEDI 2014 Volume: Issue: DOI: 10.1364/oedi.2014.of3b.3 Published: June 18, 2014Abstract:we propose the mode confinement width on power distribution proportion (CWPDP) about the surface plasmon polariton (SPP) waveguide. By investigating, it is indicated that the CWPDP is more reliable than the full width at half maximum. ? OSA 2014.Accession Number: 20151000597668 -
Record 376 of
Title:Watt-level Q-switched Nd:LuVO 4 laser based on a graphene oxide saturable absorber
Author(s):Yan, Shilian(1); Zhang, Ling(1); Yu, Haijuan(1); Sun, Wei(1); Li, Menglong(1); Hou, Wei(1); Lin, Xuechun(1); Wang, Yonggang(2); Wang, Yishan(2)Source: Journal of Modern Optics Volume: 61 Issue: 3 DOI: 10.1080/09500340.2013.879935 Published: February 6, 2014Abstract:The demonstration is reported of a diode-pumped passively Q-switched Nd:LuVO4 laser at 1064 nm using a transmission-type graphene oxide as the saturable absorber. The graphene oxide saturable absorber with a modulation depth of 10% was fabricated using a vertical evaporation method. With a pump of 11.5 W, a maximum output power of 1.353 W was obtained with 186-ns pulse duration and 336.7-kHz repetition rate, corresponding to a maximum pulse energy of 4 J per pulse. ? 2014 ? 2014 Taylor & Francis.Accession Number: 20141017426971 -
Record 377 of
Title:Transmission-type plano-concave lens using in the range of extreme ultraviolet wavelength
Author(s):Li, Yan(1); Xu, Xiangyan(2); Li, Xiao-Li(1)Source: IEEE Photonics Technology Letters Volume: 26 Issue: 12 DOI: 10.1109/LPT.2014.2320551 Published: June 15, 2014Abstract:A one-dimensional photonic crystal consisting of the fourth-order Fibonacci multilayer films has been studied by the finite-difference time-domain method and transfer matrix method. The refractive indices for two layers of the Fibonacci multilayer films are similar with that of manganese and silicon in the extreme ultraviolet (EUV) band. The simulation result shows that there is an isotropic negative refractive index for the one-dimensional photonic crystal. Based on the character above, a kind of transmission-type plano-concave lens, which can be used in the EUV band (or soft X-ray), is designed. The distributions of the electromagnetic field for the lens and transimissivity of the Fibonacci multilayers films have also been calculated. The result demonstrates that the lens can focus the incoming EUV radiation, and its transmissivity is bigger than 5%-9% compared with that of the Fibonacci multilayers films, having the same structure with the lens. This letter has potential applications in the tansmission-type lens for EUV lithography. ? 2014 IEEE.Accession Number: 20142417806886 -
Record 378 of
Title:Low loss and high birefringence Topas photonic bandgap fiber at terahertz frequency
Author(s):Wang, Dou-Dou(1); Wang, Li-Li(2); Zhang, Tao(1); Xie, You(1)Source: Guangzi Xuebao/Acta Photonica Sinica Volume: 43 Issue: 6 DOI: 10.3788/gzxb20144306.0606002 Published: June 2014Abstract:A photonic bandgap fiber was designed based on the novel Terahertz low-loss material Topas cyclic olefin copolymer. Fiber cladding was formed by arranging hexagonal air holes with rounded corners in triangular lattice pattern in the background of Topas. A rhombic hollow-core with rounded corners was formed by omitting four central air holes of the cladding structure. Propagation properties in the terahertz band of the fiber were investigated by using the finite element method. Numerical results indicate the fiber has a photonic bandgap within a broadband area about 0.3 THz around 1.5 THz, and THz wave is welled confined in the air core. Birefringence of the order of 10-3 was obtained. Loss of the x-and y-polarized fundamental modes is less than 0.1 cm-1 within 1.4~1.6 THz, and reaches the minimum value of 0.0291 cm-1 and 0.0287 cm-1 at 1.53 THz and 1.5 THz, respectively. Structure of designed terahertz Topas photonic bandgap fiber is simple, feasible for fabrication and bendable because of the relatively small diameter.Accession Number: 20142917959974 -
Record 379 of
Title:Theoretical analysis and the morphology control of vertical phase segregation in high-efficiency polymer/fullerene solar cells
Author(s):Gao, Bowen(1,2)Source: High Performance Polymers Volume: 26 Issue: 2 DOI: 10.1177/0954008313506725 Published: March 2014Abstract:The morphology control and optimization in the film-forming process and nanoscale phase separation of donor/acceptor interpenetrating networks played an important role in improving the performance of organic solar cells. Vertical phase separation was defined as an inhomogeneous distribution or concentration gradient of polymer/fullerene blends in the spin-coated film, due to the surface energy of the respective components and their interaction with the substrate or the intermediate buffer layers. In this report, we demonstrated, in detail, the theory of vertical phase separation morphology and control of conventional structure solar cells and inverted configuration solar cells, including the choice of solvents and the drying rate, the surface energy control, thermal annealing, as well as external electric field. In particular, we first proposed internal electronic field model of vertical phase separation and revealed the internal rules and organic semiconductor physics and its mechanism for improving the device efficiency and stability. ? The Author(s) 2013.Accession Number: 20140917408800 -
Record 380 of
Title:Remote-focusing microscopy with long working distance objective lenses
Author(s):Qi, Yujiao(1); Lei, Ming(1); Yang, Yanlong(1); Yao, Baoli(1); Dan, Dan(1); Yu, Xianghua(1); Yan, Shaohui(1); Ye, Tong(1)Source: Applied Optics Volume: Issue: 16 DOI: 10.1364/AO.53.003473 Published: June 1, 2014Abstract:Remote-focusing microscopy has recently attracted a lot of interest due to its high-speed axial scanning capabilities. In this paper, we modeled remote-focusing microscopy, based on a pair of long working distance objective lenses. Three-dimensional intensity distributions of the point spread functions (PSFs) are calculated, and no significant spherical aberrations are introduced over a large volume of 100 μm × 100 μm × 150 μm. The validity of the scheme is verified by imaging biological samples and microelectronic chips at the imaging depth of 150 μm without introducing aberrations in the experiment. ? 2014 Optical Society of America.Accession Number: 20142600001570 -
Record 381 of
Title:Terahertz spectral investigation of anhydrous and monohydrated glucose using terahertz spectroscopy and solid-state theory
Author(s):Zheng, Zhuan-Ping(1); Fan, Wen-Hui(1); Li, Hui(1); Tang, Jie(1)Source: Journal of Molecular Spectroscopy Volume: 296 Issue: DOI: 10.1016/j.jms.2013.12.002 Published: February 2014Abstract:The terahertz absorption spectra of anhydrous and monohydrated glucose have been investigated and compared by using THz spectroscopy and solid-sate density functional theory. The unrevealed mechanism of THz spectral differences of both materials measured has been analyzed based on the crystalline structure. Solid-state calculations of the THz characteristic spectra using Perdew-Burke-Ernzerhof functional have provided the satisfactory spectral reproduction for these two materials. It is found that the characterized features of monohydrated glucose mainly come from the intermolecular modes of water-glucose and glucose-glucose molecules, while those of anhydrous glucose origin from the interactions of glucose molecules. ? 2013 Elsevier Inc. All rights reserved.Accession Number: 20140217178778 -
Record 382 of
Title:Femtosecond-Pulse Fiber Based Amplification Techniques and Their Applications
Author(s):Zhao, Wei(1); Hu, Xiaohong(1); Wang, Yishan(1)Source: IEEE Journal of Selected Topics in Quantum Electronics Volume: 20 Issue: 5 DOI: 10.1109/JSTQE.2014.2308396 Published: September 1, 2014Abstract:Three kinds of pulse amplification techniques including chirped-pulse amplification (CPA), parabolic pulse amplification, and divided-pulse amplification (DPA) based on rare-earth doped fiber gain medium are reviewed. Large core area fiber and cladding-pumping technique compose the foundation of high average power, high pulse energy fiber CPA technology. Femtosecond pulses have been demonstrated at average powers of up to 830 W, pulse energies of up to 2.2 mJ and compressed pulse duration of 23 fs from different fiber CPA systems. The state-of-the-art performance of fiber CPA system to date is the simultaneous generation of 530 W, 1.3 mJ compressed femtosecond pulses at 400 kHz repetition rate. The balance between fiber gain, dispersion and nonlinearity is required for the self-similar propagation and thus the formation of pulses with parabolic intensity profile. Sub-33 fs pulses were demonstrated from a gain-cascaded parabolic amplification system. A newly emerging DPA technique is also reviewed. In addition, the applications of pulsed fiber amplifiers in the areas of supercontinuum generation and material micromachining system are also introduced. ? 1995-2012 IEEE.Accession Number: 20160701948387 -
Record 383 of
Title:Reconstructing signals via stochastic resonance generated by photorefractive two-wave mixing bistability
Author(s):Cao, Guangzhan(1); Liu, Hongjun(1); Li, Xuefeng(2); Huang, Nan(1); Sun, Qibing(1)Source: Optics Express Volume: 22 Issue: 4 DOI: 10.1364/OE.22.004214 Published: February 24, 2014Abstract:Stochastic resonance is theoretically investigated in an optical bistable system, which consists of a unidirectional ring cavity and a photorefractive two-wave mixer. It is found that the output properties of stochastic resonance are mainly determined by the applied noise, the crystal length and the applied electric field. The influences of these parameters on the stochastic resonance are also numerically analyzed via cross-correlation, which offers general guidelines for the optimization of recovering noisehidden signals. A cross-correlation gain of 4 is obtained by optimizing these parameters. This provides a general method for reconstructing signals in nonlinear communications systems. ? 2014 Optical Society of America.Accession Number: 20141017429351 -
Record 384 of
Title:Novel space communication technology based on modulated x-ray source
Author(s):Sheng, Li-Zhi(1); Zhao, Bao-Sheng(1); Liu, Yong-An(1)Source: Proceedings of SPIE - The International Society for Optical Engineering Volume: 9207 Issue: DOI: 10.1117/12.2062712 Published: 2014Abstract:A novel space communication method is presented in this paper based on X-ray photons. As a result of its short wavelength and great penetrability, X-ray has no attenuation for transmission in space when its photon energy is more than 10keV (λ ? 2014 SPIE.Accession Number: 20150800552535