2012
2012
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Record 193 of
Title:New design of an off-axis reflective zoom optical system
Author(s):Yan, Peipei(1,2); Fan, Xuewu(1)Source: Hongwai yu Jiguang Gongcheng/Infrared and Laser Engineering Volume: 41 Issue: 6 DOI: Published: June 2012Abstract:A method based on Seidel aberration theory and vector aberration theory was introduced for the design of mechanically compensated off-axis reflective zoom system with three mirrors. The method to achieve the initial construction parameters of zoom system was given. By constraining optimization of a set of Seidel aberration coefficient functions, the initial co-axial construction parameters were achieved. The necessity of the design of off-axis reflective zoom system based on vector aberration theory was advanced. The design method of off-axial reflective zoom system was introduced to make up for the disadvantages of co-axial reflective zoom system. The design theory about obscuration elimination and aberration correction was also analyzed. Based on the detailed indexes, an optical system was designed with the optical design software CODEV, and its image quality was evaluated. The result shows that the image of the zoom optical system meets the design demand.Accession Number: 20123715424649 -
Record 194 of
Title:Design of data acquisition system for AOTF polarization spectral imaging instrument
Author(s):Jiang, Qinghui(1,2); Qiu, Yuehong(1); Wen, Yan(1); Wang, Huan(1,2); Xu, Weixing(1,2)Source: Hongwai yu Jiguang Gongcheng/Infrared and Laser Engineering Volume: 41 Issue: 1 DOI: Published: January 2012Abstract:The hyper-spectral imaging with polarization is an emerging cross-technology. It has been the key topic to explore the technology in the aerospace, civil and other areas at home and abroad. In particular, imaging spectrometer based on acousto-optic tunable filter (AOTF) has many advantages compared with the traditional imaging spectrometers both in running mechanisms and in the design of instrument. By studying the principle of AOTF, the working process of AOTF polarization spectral imaging instrument which was used in the experiment was analyzed, the data acquisition system matching with the instrument was made and the system design process based on LabVIEW platform was discussed in detail. At the same time, the LabVIEW program design diagram of each module was given. The function of system was verified through actual scene test. The final result shows that the system can complete the image data collection efficiently and reliably, as well as controlling the hardware of the instrument correctly. In a way, it is of research and practical value for the system.Accession Number: 20121114853078 -
Record 195 of
Title:Spectrum reconstruction based on the constrained optimal linear inverse methods
Author(s):Ren, Wenyi(1,2,3); Zhang, Chunmin(1,2); Mu, Tingkui(1,2); Dai, Haishan(1,2)Source: Optics Letters Volume: 37 Issue: 13 DOI: 10.1364/OL.37.002580 Published: July 1, 2012Abstract:The dispersion effect of birefringent material results in spectrally varying Nyquist frequency for the Fourier transform spectrometer based on birefringent prism. Correct spectral information cannot be retrieved from the observed interferogram if the dispersion effect is not appropriately compensated. Some methods, such as nonuniform fast Fourier transforms and compensation method, were proposed to reconstruct the spectrum. In this Letter, an alternative constrained spectrum reconstruction method is suggested for the stationary polarization interference imaging spectrometer (SPIIS) based on the Savart polariscope. In the theoretical model of the interferogram, the noise and the total measurement error are included, and the spectrum reconstruction is performed by using the constrained optimal linear inverse methods. From numerical simulation, it is found that the proposed method is much more effective and robust than the nonconstrained spectrum reconstruction method proposed by Jian, and provides a useful spectrum reconstruction approach for the SPIIS. ? 2012 Optical Society of America.Accession Number: 20122915253125 -
Record 196 of
Title:All-fiber dissipative solitons evolution in a compact passively Yb-doped mode-locked fiber laser
Author(s):Li, Xiaohui(1,2); Wang, Yishan(1); Zhao, Wei(1); Liu, Xianglian(1,2); Wang, Yonggang(3); Tsang, Yuen Hong(3); Zhang, Wei(1); Hu, Xiaohong(1); Yang, Zhi(1); Gao, Cunxiao(1); Li, Cheng(1); Shen, Deyuan(1)Source: Journal of Lightwave Technology Volume: 30 Issue: 15 DOI: 10.1109/JLT.2012.2201210 Published: 2012Abstract:Compact all-fiber all-normal dispersion Yb-doped fiber ring laser is demonstrated based on nonlinear polarization rotation technique. Dissipative solitons (DSs) with bell-shaped spectra are observed in the fiber cavity with linear chirps for the first time to our knowledge. Stable pulse width is 9.7 ps with the pulse energy of 1.2 nJ, which can be compressed to near the transformed limited pulse duration of 225 fs. The experimental result agrees well with the numerical simulations. The theoretical modeling indicates that the formation of the bell-shaped spectra is due to the combined effect of normal dispersion, nonlinearity, gain, loss, and spectral filtering effect. Different from the pulse evolution in the mode-locked fiber laser based on the wave plate and the birefringent plate, conventional DSs with rectangular-shaped spectra can be obtained by varying the polarization orientation of the cavity. ? 1983-2012 IEEE.Accession Number: 20122815226366 -
Record 197 of
Title:All-fiber polarization interference filters based on 45°-tilted fiber gratings
Author(s):Yan, Zhijun(1); Mou, Chengbo(1); Wang, Hushan(1,2); Zhou, Kaiming(1); Wang, Yishan(2); Zhao, Wei(2); Zhang, Lin(1)Source: Optics Letters Volume: 37 Issue: 3 DOI: 10.1364/OL.37.000353 Published: February 1, 2012Abstract:We report all-fiber polarization interference filters, known as Lyot and Lyot-?hman filters, based on alternative concatenation of UV-inscribed fiber gratings with structure tilted at 45° and polarization maintaining (PM) fiber cavities. Such filters generate comb-like transmission of linear polarization output. The free spectral range (FSR) of a single-stage (Lyot) filter is PM fiber cavity length dependent, as a 20 cm long cavity showed a 26.6 nm FSR while the 40 cm one exhibited a 14.8 nm FSR. Furthermore, we have theoretically and experimentally demonstrated all-fiber 2-stage and 3-stage Lyot-?hman filters, giving more freedom in tailoring the transmission characteristics. ? 2012 Optical Society of America.Accession Number: 20120614757181 -
Record 198 of
Title:Design of polarity-preserved or polarity-inverted wavelength converters using cross-phase modulation in a highly nonlinear photonic crystal fiber with flat dispersion
Author(s):Hui, Zhan-Qiang(1,2); Zhang, Jian-Guo(2,3)Source: Journal of Optics (United Kingdom) Volume: 14 Issue: 6 DOI: 10.1088/2040-8978/14/6/065402 Published: June 2012Abstract:In this paper, we propose the design of tunable and robust wavelength converters which can perform the polarity-preserved or polarity-inverted wavelength conversion by using the cross-phase modulation (XPM) in a dispersion-flattened highly nonlinear photonic crystal fiber (DF-HNL-PCF). The newly designed wavelength converter consists of a DF-HNL-PCF and an optical band-pass filter in the simple straight-line configuration, where XPM leads to broadening the spectrum of a continuous-wave probe light and the polarity-preserved, tunable wavelength conversion is then implemented by filtering out the blue-chirped or red-chirped spectral component of a probe light. The experimental results show that the polarity-preserved wavelength converter using a DF-HNL-PCF can achieve the error-free conversion of 10Gbits1 optical data signals with the maximum power penalty of less than 2.1 dB over a wavelength range of nearly 34 nm. This wavelength tunability is actually limited by an operational wavelength range of the tunable optical band-pass filter that is used to extract the wavelength-converted signal in our experiment. Moreover, the polarity-inverted wavelength conversion is observed at the XPM-based wavelength converter using a DF-HNL-PCF, for the first time. This is achieved by tuning the central wavelength of an optical band-pass filter to coincide with that of a chirped probe light. ? 2012 IOP Publishing Ltd.Accession Number: 20122315102575 -
Record 199 of
Title:Experiments on a compact and robust polarization-entangled photon source
Author(s):Zhang, Shi-Wei(1,2,3); Zhang, Tong-Yi(1); Yao, Yin-Ping(1,3); Wan, Ren-Gang(1); Zou, Sheng-Wu(1,3)Source: Proceedings of SPIE - The International Society for Optical Engineering Volume: 8333 Issue: DOI: 10.1117/12.918835 Published: 2012Abstract:We construct a compact polarization-entangled photon source using type-II degenerate spontaneous parametric down-conversion (SPDC) in beta-barium borate (BBO) crystal pumped by a 405 nm violet laser diode. In order to compensate the spatial displacement and the temporal delay due to the birefringence and dispersion effect of signal and idler photons, we make the down-converted photon pairs pass through a half wave plate and an additional BBO crystal with the half thickness of the original one. This improves the visibility of two-photon interference by eliminating the distinguishability of the paired photons. We measure the polarization correlations by two adjustable polarization analyzers in two conjugate bases, H/V and +45°/-45°, respectively. The polarization analyzer consists of a polarization beam splitter cube preceded by a rotatable half wave plate. When rotating one of the half wave plates and keeping the other one at fixed angle, we obtain the expected sin2 dependence of the coincidence counts. The highly visible sinusoidal coincidence indicates the violation of the Bell inequality and demonstrates the high quality of the polarization-entangled photon source. This compact polarization-entangled photon source is easily configurable and robust to demonstrate optical quantum information processing. ? 2012 Copyright Society of Photo-Optical Instrumentation Engineers (SPIE).Accession Number: 20121014832677 -
Record 200 of
Title:Color-stable deep red-emitting OLEDs based on a soluble terpolymer containing fluorene, thiophene and benzothiadiazole units
Author(s):Qu, Bo(1); Feng, Limin(2); Yang, Hongsheng(1); Gao, Zhi(1); Gao, Chao(2,3); Chen, Zhijian(1); Xiao, Lixin(1); Gong, Qihuang(1)Source: Synthetic Metals Volume: 162 Issue: 17-18 DOI: 10.1016/j.synthmet.2012.06.021 Published: October 2012Abstract:A novel soluble terpolymer (P8FO-Th-BT) containing 9,9-dioctylfluorene, thiophene, and 2,1,3-benzothiadiazole units were synthesized by Still coupling reaction. The single layer and multi-layer organic light emitting diodes (OLEDs) based on P8FO-Th-BT was fabricated. A deep red-emission device with the configuration of ITO/poly(3,4-ethylenedioxythiophene)-polystyrene sulfonate (PEDOT:PSS)/P8FO-Th-BT:N,N′-di(3-methylphenyl)-N,N′-diphenyl-(1, 1′-biphenyl)-4,4-diamine (TPD) (weight ratio being 1:1)/2,9-dimethyl-4,7- diphenyl-1,10-phenanthroline (BCP, 15 nm)/tris(8-hydroxyquinoline) aluminum (Alq3, 15 nm)/LiF(5 )/Al(150 nm) was obtained, and the maximum luminance was measured to be 226 cd/m2 at the bias voltage of 10 V. The electroluminescent peak located at 708 nm, and the spectrum covered both the red and infrared regions. Moreover, the Commission International De L'Eclairage (CIE) chromaticity coordinates of the device were inalterable when the bias voltage varied, which was beneficial to the application on display. ? 2012 Elsevier B.V. All rights reserved.Accession Number: 20123715430947 -
Record 201 of
Title:Design and performance experiment of ultraviolet off-axis TMA system
Author(s):Feng, Liangjie(1); Wang, Chenjie(1); Fan, Xuewu(1); Zhang, Haosu(1); Pang, Zhihai(1)Source: Proceedings of SPIE - The International Society for Optical Engineering Volume: 8417 Issue: DOI: 10.1117/12.978644 Published: 2012Abstract:The limb UV radiation detection provides the information of atmosphere ultraviolet spectrum, so as to acquire the high resolution vertical distribution information of atmospheric trace gases and aerosol. Off-axis Three-mirror Anastigmat (TMA) system is adopted in limb UV radiation detection to increase horizontal space coverage. In this paper, opto- mechanical design of the system is introduced, and camera alignment is completed by computer aiding, then optical, mechanical and electrical combination as well as the optical performance test are carried out with the UV Image Intensifier. The camera's wavefront error of each field is close to design value after alignment, the resolution reaches 140lp/mm in visible light band, and 20lp/mm in UV band, which reaches the design limit of the UV Image Intensifier, the optical system could well meet the operational requirement. ? 2012 SPIE.Accession Number: 20131416173426 -
Record 202 of
Title:Synthesis and optical properties of Nd(III) perfluoro-carboxylate complexes with 2, 2'-bipyridine
Author(s):She, Jiang-Bo(1); Li, Dong-Dong(2); Wang, Peng-Fei(1); Zhu, Yong-Gang(1); Wei, Wei(3); Peng, Bo(1,3)Source: Guang Pu Xue Yu Guang Pu Fen Xi/Spectroscopy and Spectral Analysis Volume: 32 Issue: 4 DOI: 10.3964/j.issn.1000-0593(2012)04-1047-04 Published: April 2012Abstract:A series of neodymium complexes, Nd(CF3COO)3·Dipy, Nd(C2F5COO)3·Dipy and Nd(C3F7COO)3·Dipy were synthesized and characterized by FTIR spectra, elemental analysis, thermogravimetric analysis, UV-Vis-NIR absorption spectra and PL spectra. The decomposition temperature was found to be more than 260°C and maximum weight losses rates above 340°C which indicate that they have good thermal stability. The low vibrational energy C-F bonds were used to replace the C-H bonds in organic group for improving the optical properties of materials. The length of carbon chain and the coordination structure of Nd(III) affect the absorption transition strength. According to the UV-Vis-NIR absorption spectra, the Judd-Ofelt parameters were calculated and the radiative properties were also presented. The stimulated emission cross-sections of the Nd(CF3COO)3·Dipy, Nd(C2F5COO)3·Dipy and Nd(C3F7COO)3·Dipy were 3.63×10-20, 2.36×10-20 and 1.49×10-20 cm2 respectively, which were as good as some reported inorganic materials. These complexes will be a series of promising materials for liquid laser application.Accession Number: 20121514940821 -
Record 203 of
Title:Principle and analysis of a moving double-sided mirror interferometer
Author(s):Yang, Qinghua(1); Zhao, Baochang(1); Wen, Desheng(1)Source: Optics and Laser Technology Volume: 44 Issue: 5 DOI: 10.1016/j.optlastec.2012.01.001 Published: July 2012Abstract:A moving double-sided mirror interferometer (MDSMI) is presented. It comprises one moving double-sided mirror (MDSM), one fixed corner-cube mirror, one fixed plane mirror, and one beam-splitter. The MDSM is a plane-parallel glass plate with both faces coated with high-reflectivity films. The optical path difference (OPD) is created by the straight reciprocating motion of the MDSM driven by a linear actuator, and the OPD value is four times the displacement of the MDSM without tilt. The effect of tilt of the MDSM is analyzed, and the tilt tolerance of the MDSM is systematically analyzed by means of modulation depth and phase error. The MDSMI is very suitable for high-resolution rapid-scan infrared spectrometers. ? 2012 Elsevier Ltd. All rights reserved.Accession Number: 20120814786203 -
Record 204 of
Title:Theoretical energy distributions of electrons from a large exponential-doping GaAs photocathode
Author(s):Cai, Zhipeng(1); Yang, Wenzheng(2); Tang, Weidong(1); Hou, Xun(1)Source: Advanced Materials Research Volume: 415-417 Issue: DOI: 10.4028/www.scientific.net/AMR.415-417.1302 Published: 2012Abstract:Theoretical calculation indicates that the large exponential-doping GaAs photocathodes have a much narrower electron energy distribution than traditional GaAs NEA cathodes, and the excellent performance attributes to the special structure characters of the band-bending region and lower negative electron affinity of the new-type GaAs photocathodes. The effects of surface doping concentration and work function on the energy distribution are discussed in details, and the FWHM of the energy distribution is less than 100meV. The simulation results indicate that the large exponential-doping mode further improves the features of the electron energy spreads for GaAs photocathodes, which may meet the further demand of next generation of electron guns.Accession Number: 20115214644770