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Laser Physics and Laser Technologies (RCSLPLT) and 2010 Academic Symposium on Optoelectronics Technology (ASOT), 2010 10th Russian-Chinese Symposium on

Date July 28 2010-Aug. 1 2010

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  • [Front cover]

    Publication Year: 2010 , Page(s): c1
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  • [Copyright notice]

    Publication Year: 2010 , Page(s): 1
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  • Committees

    Publication Year: 2010 , Page(s): 1
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  • Table of contents

    Publication Year: 2010 , Page(s): 1 - 6
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  • Carbon nanotubes and thermal properties

    Publication Year: 2010 , Page(s): 72 - 75
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (2247 KB) |  | HTML iconHTML  

    Because of high thermal conductivity, the carbon nanotubes (CNT) present extensive application prospects, particularly in microelectronic, optoelectronic device heat sinks, and semiconductor lasers. In this letter, the single walled carbon nanotubes are prepared with high yield by DC arc discharged with Y/Ni as catalysts. The morphology, diameter distribution and microstructure of the carbon nanotubes are analyzed with transmission electron microscope (TEM) and resonant Raman spectroscopy. The thermal properties of carbon nanotubes are studied. It finds that the tube diameter increases with the temperature rising, and the large tube has the small thermal-sensitivity, suitable for applications as the heat dissipation in device. View full abstract»

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  • Development of micro fuel cell

    Publication Year: 2010 , Page(s): 1 - 7
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    In this paper, a brief description about the development of micro polymer electrolyte fuel cell (PEFC) was presented. PEFCs were divided into two different types: micro proton exchange membrane fuel cell, which used hydrogen as fuel, and micro direct methanol fuel cell, which used liquid methanol as fuel. To compete with the advanced batteries technology, the miniaturization of the fuel supply system of micro fuel cell remained a great challenge. This point was emphasized in this article. View full abstract»

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  • Broad area semiconductor lasers with tailored gain

    Publication Year: 2010 , Page(s): 90 - 92
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (380 KB) |  | HTML iconHTML  

    According to the principle of carrier diffusion, we fabricated an electric pattern high power single quantum well broad area semiconductor laser. The designed devices have special current injection stripe which forms Gaussian-like photon gain laterally. Utilizing this principle, tailored gain lasers exhibiting near single lobe far field patterns were found. The tailored gain lasers emitting at 808 nm with the measured full width at half maximum angle of 4.1°, the maximum continuous wave output power up to 3.4W, and slope efficiency as high as 0.89 W/A were reported. The beam quality of the broad area semiconductor single quantum well laser has been improved obviously by the designed devices. View full abstract»

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  • Laser characteristics of xenon-lamp pumped PM580 alcohol solution

    Publication Year: 2010 , Page(s): 46 - 48
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (459 KB) |  | HTML iconHTML  

    The energy output characteristics, temporal profile and spectral characteristics of xenon-lamp pumped dye (PM580) laser with different molar concentrations were investigated in this paper. The experimental setup adopts the ordinary industrial products without special design. Output energies have been achieved with energy conversion efficiency and slope efficiency of almost 0.336% and 0.36%. View full abstract»

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  • Multispectral imaging system using Rotary polarization acousto-optic tunable filter

    Publication Year: 2010 , Page(s): 49 - 51
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (460 KB) |  | HTML iconHTML  

    In order to obtain multispectral imaging system and enhance the performance of acousto-optic tunable filter AOTF, Rotary polarization technique was used in the AOTF designing. According to spectral bandwidth, acousto-optic figure of merit, acoustic frequency spectral range, the polar angle for incident and diffracted beams ware optimized. Spectral and spectral imaging on rang of 400-800nm ware acquired. View full abstract»

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  • High power Er3+/Yb3+ co-doped fiber amplifier of fiber length optimization

    Publication Year: 2010 , Page(s): 76 - 79
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (523 KB) |  | HTML iconHTML  

    Aim to investigate the 1555 nm high power fiber amplifier with different lengths of gain fiber, a two-stage hybrid fiber amplifier structure was employed. It comprises an erbium-doped fiber amplifier (EDFA) as a pre-amplifier and an erbium/ytterbium co-doped double-cladding fiber amplifier (EYCDFA) as a post-amplifier. EDFA can pre-amplify the input signal and provide the good noise figure. EYCDFA as the main amplifier with special double-cladding configuration can couple more pump power into the system. The optimization of erbium/ytterbium co-doped fiber length was investigated experimentally and analyzed theoretically. The signal power is 10 mW, the maximum pump power of the EDFA is 318.58 mW, the total pump power of the EYCDFA is 11.47 W, the length of the EYCDF is 14 m, and the output power is 2.11 W. It shows that there is an optimal length under the certain pump power and the signal power, and the result is good for the study of high-power fiber amplifier. View full abstract»

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  • A laser precise pointing method using deformable mirrors in target area

    Publication Year: 2010 , Page(s): 64 - 67
    Cited by:  Papers (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (580 KB) |  | HTML iconHTML  

    This paper presents a configuration and its corresponding control algorithm for using large aperture deformable mirrors in the laser precise pointing system of inertial confinement fusion (ICF) target area. Simulation results show that this configuration can greatly enhance the focus energy concentricity and the pointing accuracy of the laser beams. View full abstract»

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  • Study on stable output of light source based on the principle of optical bistability

    Publication Year: 2010 , Page(s): 114 - 115
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (597 KB) |  | HTML iconHTML  

    We proposed a new type of light source which was constituted of erbium-doped fiber and based on the principle of optical bistability. The system had a stable output power, tunable wavelength, variable power, and it could be used in fiber optic sensing, optical detection system. View full abstract»

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  • Widely tunable compact Er3+-doped fiber ring laser

    Publication Year: 2010 , Page(s): 112 - 113
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (625 KB) |  | HTML iconHTML  

    A widely tunable compact erbium-doped all fiber ring laser with 104nm turning range was reported. A fiber Fabry-Perot filter (FFP-TF) was used to be the tuning element to realize turning range from 1513nm to 1617nm with the linewidth less than 40 pm at any wavelength. The fiber laser worked with slope efficiency of above 10% and threshold of less than 21mW. This fiber laser can be used to realize wavelength interrogation with a relatively high speed and high resolution. View full abstract»

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  • Theoretical study of vanadium oxide components effect on phase transition temperature

    Publication Year: 2010 , Page(s): 170 - 173
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (622 KB) |  | HTML iconHTML  

    Vanadium dioxide is a kind of thermotropic phase transition material with the nearest phase transition temperature to the room temperature, which can be used in the laser protection area and Uncooled Microbolometer. VO2 is prepared on ZnSe by magnetron sputtering method, and the optical character changing of different components vanadium oxide thin films are tested by Nicolet 8700 IR spectrometer. Some phenomena are observed. Because different components have different phase transition character, their phase transition temperatures are all lower than vanadium dioxide's 68°C. The energy band structure of vanadium oxide molecule is calculated by Material Studio, and the theoretic calculation explains how the components affect the phase transition temperature. Control the components of vanadium oxide by annealing, then adjust the phase transition temperature, and a new technique which changing the phase transition temperature without doping was found. View full abstract»

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  • Design and optimization of IF amplifier based on the electronic tracker in the heterodyne imaging lidar

    Publication Year: 2010 , Page(s): 221 - 223
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (633 KB) |  | HTML iconHTML  

    IF amplifier is the key component part between analog module and digital module in laser radar system. IF amplifier performance affects directly the signal to noise ratio, image quality and detection range of imaging laser radar system. In this paper, we design and develop IF amplifier. Also, we do the optimal analysis basing on the electronic tracking devices-the-loop simulation platform (ETDLSP). Firstly, we establish a simulation model of IF amplifier. Secondly, we build a semi-physical simulation platform of the electronic tracking devices (ETD) and do the optimization analysis of the IF amplifier performance using the platform. Lastly, the design method has been verified using a laser radar developed in our laboratory, with access to the system optimum IF bandwidth of 70MHz. View full abstract»

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  • Tunable amplified spontaneous emission and narrow linewidth laser based on dye doped nematic liquid crystals

    Publication Year: 2010 , Page(s): 39 - 41
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    PM650 and PM567 doped nematic liquid crystals (NLC) cells were fabricated. With an applied electric field in PM650 doped nematic liquid crystals, tunable amplified spontaneous emission (ASE) was realized due to the change of the effective refractive index of the NLC layer caused by the reorientation of NLC molecules. By using holographic excitation, narrow linewidth laser at about 571 nm was also realized in PM567 doped nematic liquid crystals. View full abstract»

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  • Study on the distribution of trap levels in PI by OPO laser

    Publication Year: 2010 , Page(s): 167 - 169
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    In this paper, the photo-stimulated discharge (PSD) current spectra of polyimide (PI) are obtained by the optical parametric oscillator (OPO) laser to characterize the deep space charge traps in the dielectric materials. The result shows that the energy level of charge traps in the PI film is distributed in 3.10~4.10eV, and the main part concentrates in 3.35~3.85eV. These data can provide experimental basis for the further research and improvement on electrical properties of materials. View full abstract»

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  • Spatial acquisition optimization based on average acquisition time for intersatellite optical communications

    Publication Year: 2010 , Page(s): 244 - 248
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (636 KB) |  | HTML iconHTML  

    An analytical expression for the prediction of the parallel processing acquisition time based on spiral scan, which is correlated with the distribution function of satellite position, size of the uncertainty area, response time of terminals, link distance and beam divergence angle, is derived for satellite optical communication in the process of acquisition. And correspondingly, the estimation of the serial processing acquisition time is also presented. These expressions allow us to optimize the performance of acquisition analytically. Then the average acquisition time is discussed as a function of link distance. The optimum acquisition mode is analyzed in term of the average acquisition time. Comparison and discussion of the two modes shows that there is an critical value of link distance, L0, which determines the optimum acquisition processing mode for optical communication systems. The results obtained here is useful in facilitating parametric estimation and optimization of acquisition system design. View full abstract»

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  • Laser cesium magnetic sensor system based on MEMS technology

    Publication Year: 2010 , Page(s): 311 - 313
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (645 KB) |  | HTML iconHTML  

    The magnetic field sensor of chip level is attracting more and more attention. In this paper, a laser cesium magnetic sensing system based on micro-electro-mechanical system (MEMS) technology was designed. The system was stacked vertically on a silicon chip, with the vertical cavity surface emitting lasers (VCSELs) to pump the absorption chamber between glass and silicon. The magnetic field outside, even very weak, can change the atoms array, and the information of magnetic field therefore is able to be detected by optical pumping. The paper presented the analysis and system design of the laser magnetic sensor system using MEMS technology. The transition process of the particles were calculated and studied. We believe that the magnetic field sensor of chip level will have a wide range of applications. View full abstract»

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  • Vertical-cavity surface-emitting lasers fabricated with efficient packaging method

    Publication Year: 2010 , Page(s): 87 - 89
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    Vertical cavity surface emitting lasers with large aperture were fabricated by using wet oxidation technique at about 420°C, and the device chips were packaged with three different packaging methods. The optical output power and wavelength shift of the devices were compared experimentally. The device bonded with diamond spreader shows the best performance, and 200μm-diameter device produces a room temperature continuous wave optical output power of 0.51W. The devices with larger aperture size were also fabricated in experiment. View full abstract»

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  • Improvement of electromagnetic energy transfer efficiency for radio frequency explosive magnetic flux compression generator

    Publication Year: 2010 , Page(s): 378 - 380
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (651 KB) |  | HTML iconHTML  

    In order obtain the chemical energy of the explosive charges sufficiently and increase the transfer efficiency of the electromagnetic energy, this paper proposes that the max capacitor discharge current moment should be chosen as the detonation time of the radio frequency explosive magnetic flux compression generator. By comparing two radio frequency explosive magnetic flux compression generator detonations in different initial conditions, it can be conclude that maximum output current and chemical energy of the explosive charges are used sufficiently so that electromagnetic energy transfer efficiency is increased through this method. View full abstract»

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  • The novel facet coating technology for 808nm semiconductor laser

    Publication Year: 2010 , Page(s): 106 - 108
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (647 KB) |  | HTML iconHTML  

    A novel facet coating technology is presented by studying catastrophic optical mirror damage mechanism of semiconductor laser. In this technology, semiconductor laser are cleaved in the air, and the surface oxide layer is removed with a low energy ion source, flowed immediately by coating the facet with thin ZnSe layer of 20 nm. The function of this layer is to protect semiconductor laser facet, and prevent impurity particles diffusing to the facet. Finally the facet is coated with oxidative optical film. The test results show that the output power of the semiconductor laser with the ZnSe coated layer is 13% higher than that of the Si coated layer, and 47% higher than that of the oxide coated film. The device coated oxide film is damaged when current is 4.5 A, and the device coated with Si layer is damaged when current is 5.5 A, the final failed device is coated with ZnSe layer. In conclusion, the method of coating ZnSe layer on the semiconductor laser facet can prevent effectively the catastrophic optical mirror damage, and increase the output power of semiconductor lasers. View full abstract»

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  • Optimal design for improving performance of VCSELs

    Publication Year: 2010 , Page(s): 93 - 95
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    A new device structure is reported to improve performance of vertical cavity surface-emitting lasers (VCSELs). Namely many cylindrical holes (CH) or noncontiguous ring trench (NRT) are etched instead of the conventional ring trench (RT). The mesa with such new structure offers radial bridges for current injection, the connecting Ti-Au metal between ohmic contact and bonding pad does not have to cross the ring trench, and it would not cause the connecting metal broken. The 850nm VCSELs with CH have a light output power higher than 10 mW and have a maximum of 12.5 mW at 29.6 mA, 1.34 times as much as those with RT. And the 980nm VCSELs with NRT have a maximum light output power of 28.8 mW at 49.5 mA, 1.6 times as much as those with RT. In addition, these new structure VCSELs also show high-temperature operation characteristics. View full abstract»

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  • The analysis of logarithm fitting method for measuring decay time of optical fiber fluorescence sensors

    Publication Year: 2010 , Page(s): 288 - 291
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (653 KB) |  | HTML iconHTML  

    The logarithm fitting method, due to its simple principle, quick operational speed and accepted accuracy, is widely used to measure the decay time of the fluorescence temperature or pH value sensors. Using logarithm fitting method, the unavoidable random noise of the acquired signal causes the random fitting error of the decay time. In addition, we found that the random noise will lead a systemic deviation of the fitting decay time. The higher the noise level is, the smaller the fitting decay time is. Based on analysis and simulation, we explained the reason of systemic deviation of the decay time of a single-exponential decay with random noise and gave a modified method. View full abstract»

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  • A novel communication strategy between PE and NI in NoC-based MPSoC

    Publication Year: 2010 , Page(s): 374 - 377
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (655 KB) |  | HTML iconHTML  

    More and more computing cores will be integrated in the future SoC to deal with the growing application requirement. For such Multi-Processor System-on-Chip (MPSoC) with high integration and large complexity, one key issue is the on-chip communication among various cores. By the way of analyzing the communication process, this paper proves that the bottleneck of inter-core communication is the interaction between computing and communicating element. Targeting high efficiency of such interaction, a novel interaction strategy which combines a Lookup Table (LUT) mechanism and DMA mode, is proposed. In this strategy, a hardware message address table is created in the network interface (NI), and NI can transfer the data from the network to local memory directly by looking up this table. It can remarkably reduce the usage of CPU interruption during communication, which is significant to improve the communication performance. The experimental results show that the proposed strategy brings better performance than the traditional buffer pool strategy when the message size is big, and performs the same when the message size is small. View full abstract»

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