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Advanced Optoelectronics and Lasers (CAOL), 2010 International Conference on

Date 10-14 Sept. 2010

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Displaying Results 1 - 25 of 101
  • [Front and back cover]

    Publication Year: 2010 , Page(s): c1 - c4
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  • [Title page]

    Publication Year: 2010 , Page(s): 1
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  • [Copyright notice]

    Publication Year: 2010 , Page(s): 1
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    Freely Available from IEEE
  • CAOL*2010 Program Committee

    Publication Year: 2010 , Page(s): I
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  • Contents

    Publication Year: 2010 , Page(s): II - VI
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  • Micro-/nano-photonic device structures applied to communications, sensing and consumer optoelectronics

    Publication Year: 2010 , Page(s): 1 - 3
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (359 KB) |  | HTML iconHTML  

    Device structures in high refractive index materials, notably semiconductors such as silicon, will form the basis for high-density integrated photonics. Nanometre-scale structuring - in conjunction with photonic crystal, photonic wire and plasmonic/metamaterial principles - will be required in order to realise the full potential for a variety of applications. View full abstract»

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  • Optical soliton pulses with relativistic characteristics

    Publication Year: 2010 , Page(s): 4 - 6
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (372 KB) |  | HTML iconHTML  

    The slowly varying envelope approximation and the ensuing Galilean boost to a local time frame are near-universal features of conventional scalar pulse models. Here, we will give an overview of our recent progress with a new approach to nonlinear pulse modelling, which is based on a Helmholtz-type formalism. View full abstract»

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  • Trends and challenges in optical packet networking: The network layer perspective

    Publication Year: 2010 , Page(s): 7 - 11
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (182 KB) |  | HTML iconHTML  

    The immense growth of the Internet which is accompanied by the emergence of new communication technologies, applications, and devices, results in the evolution from voice-centric toward data-centric optical networks. In this paper we overview some of the trends in optical packet networking and identify several related research problems. Our particular focus is on the network layer aspects of future optical networks. View full abstract»

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  • Tunable nonlinear metamaterials and plasmon nanofocusing

    Publication Year: 2010 , Page(s): 12 - 14
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (353 KB) |  | HTML iconHTML  

    We discuss tunability and nonlinear properties of metamaterials operating at microwave and optical frequencies. We also study the fundamental nonlinear effects in metal-dielectric waveguides supporting surface plasmon polaritons, and discuss nanofocusing of a plasmon beam and soliton formation in a tapered waveguide in the presence of losses. View full abstract»

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  • Strong turbulence analysis of sinusoidal and hyperbolic Gaussian beams

    Publication Year: 2010 , Page(s): 15 - 17
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (431 KB) |  | HTML iconHTML  

    We formulate the on-axis asymptotic scintillations of sinusoidal and hyperbolic Gaussian beams, namely cos and cosh Gaussian beam, under strong turbulence conditions. Our results are displayed in the form of plots of the scintillation index against propagation distance and wavelength at several source and propagation parameters. It is revealed that at small source sizes, cosh Gaussian beams will exhibit the lowest scintillations, but at large source sizes, this will reverse and cos Gaussian beams will attain such characteristics. It is further found that in strong turbulence, longer wavelengths will offer less scintillations, a behavior similar to the one, encountered in weak scintillation conditions. View full abstract»

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  • Evolution of nanophotonics from semiconductor photonic crystal device to metal/semiconductor plasmonic device

    Publication Year: 2010 , Page(s): 18 - 24
    Cited by:  Papers (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (2636 KB) |  | HTML iconHTML  

    This paper reviews our recent activities on nanophotonics based on a photonic crystal (PC)/quantum dot (QD)-combined structure for an all-optical device and a metal/semiconductor composite structure using surface plasmon (SP) and negative refractive index material (NIM). The former structure contributes to an ultrafast signal processing component by virtue of new PC design and QD selective-area-growth technologies, while the latter provides a new RGB color filter with a high precision and optical beam-steering device with a wide steering angle. View full abstract»

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  • New coupled micro-ring resonator structures and laser arrays

    Publication Year: 2010 , Page(s): 25 - 27
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (843 KB) |  | HTML iconHTML  

    We have recently put forward a new type of zig-zag micro-ring resonator chain. This device has been demonstrated, for passive structures, using SiN technology. But the active structures are the ones exhibiting the most interesting behaviour and, for them, new fast and slow light phenomena have been predicted. For the stable operation of such systems, we have proposed and analysed a laser array configuration. View full abstract»

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  • Recent progress on deep-ultraviolet coherent light sources

    Publication Year: 2010 , Page(s): 28 - 32
    Cited by:  Papers (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1045 KB) |  | HTML iconHTML  

    The practical deep-ultraviolet (DUV, below 200nm) coherent light sources, which are considered as puzzles of laser field, can provide a kind of unique tool to explore the front fields of biology, physics, chemistry, material etc.. The methods to obtain the DUV coherent light sources are reviewed and compared, and all-solid-state DUV lasers are precise and practical compared with the others. Recent progresses on them and their engineering in our lab are reported, and some new phenomena such as Fermi pockets in superconductor are discovered with them. View full abstract»

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  • Effective mode volume of a natural mode of an open dielectric resonator with an active region

    Publication Year: 2010 , Page(s): 33 - 35
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (306 KB) |  | HTML iconHTML  

    We study the lasing eigenvalue problem for a generic open dielectric resonator with gain material. The gain is introduced within the active region via the “active” imaginary part of the refractive index. Each eigenvalue is constituted of two positive numbers, namely, the lasing wavenumber and the threshold value of material gain. This approach yields clear insight into the lasing thresholds of individual modes. The Optical Theorem, if applied to the lasing-mode field, puts familiar “gain=loss” condition on firm footing. It enables us to rigorously introduce the conception of the volume of an open resonator and then the effective-mode volume, both for the passive cavities and cavities with active regions. View full abstract»

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  • Pneumatic photonic crystals: Properties and multiscale indication of pressure

    Publication Year: 2010 , Page(s): 36 - 37
    Cited by:  Papers (1)
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (539 KB) |  | HTML iconHTML  

    A pneumatic optical medium (POM) sensitive to pressure and temperature due to gaseous voids inside is studied theoretically. The properties of glass, quartz and mica made POM in infrared and visual regions are analyzed. The Kerr type nonlinearity is predicted. Multiscale regimes of pressure and temperature indication are discussed. View full abstract»

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  • Non-stationary coherent population trapping in frequency-modulated fields

    Publication Year: 2010 , Page(s): 38 - 39
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (431 KB) |  | HTML iconHTML  

    Coherent population trapping (CPT) resonance formation is modeled numerically in a three-level Λ -system with one of the near-resonance fields being frequency-modulated. The model is based on density matrix equations in RW approximation with atomic relaxation properly taken into account. Slow modulation is shown to be equivalent to CW excitation with the frequency changed point by point. As the modulation period approaches the relaxation times, the delayed response of the system is shown to cause the CPT resonance shift and reshaping, as well as the appearance of transient oscillations of the energy level populations. View full abstract»

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  • Mechanisms of holographic recording in photopolymers

    Publication Year: 2010 , Page(s): 40 - 42
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (297 KB) |  | HTML iconHTML  

    Overview of physical mechanisms of photopolymers formations for laser and holographic applications. View full abstract»

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  • Superradiant heterolasers

    Publication Year: 2010 , Page(s): 43 - 45
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (477 KB) |  | HTML iconHTML  

    The phenomenon of collective recombination (superfluorescence or superradiance) of electrons and holes in semiconductor laser structures of various dimensions is reviewed. At the current level of technology, this phenomenon can be realized most easily in quantum-well and quantum-dot heterostructures. Under CW pumping, it could lead to the generation of powerful coherent radiation pulses which are shorter than incoherent relaxation times and have nothing to do with mode-locking technique. Particular attention is paid to the external magnetic field and distributed feedback of waves which favor suparradiant lasing. View full abstract»

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  • Selected fundamental and applied problems of laser mode formation

    Publication Year: 2010 , Page(s): 46 - 51
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1855 KB) |  | HTML iconHTML  

    Several problems are considered in this review. Using our dipole wave theory of diffraction the analytical formulas for diffraction from a narrow ring for different polarization were obtained. They were used in the new wave numerical model of an open resonator. A number of parameters of mode formation were investigated. It was shown that multipass geometrical “modes” win in competition with single pass Laguerre-Gaussian (LG) non-main modes during the relaxation oscillations. A method has been suggested for description of the azimuthally (A) and radially (R) polarized modes that excludes any inherent contradictions and unjustified approximations. It allows the analytical calculation of the field components for these modes, including the longitudinal one. Generation of high power beams with axial symmetric polarization in stable resonator of industrial CO2-laser with diffraction gratings has been realized. The transformation of azimuthally polarized mode to R-polarized mode was demonstrated. R-polarized beam was successfully used for cutting metal. The principal scheme based on a modified Sagnac interferometer was proposed and investigated experimentally. This external cavity technique was used for generation of R- and A-polarized laser beam. View full abstract»

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  • Properties of the interaction of laser radiation with a gaseous dust medium

    Publication Year: 2010 , Page(s): 52 - 54
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (289 KB) |  | HTML iconHTML  

    Radiation power for the combustion of carbon particles is measured at particles irradiation in air by a cw CO2 laser. For the medium in the form of a free vertical jet the dependences of the threshold radiation intensity for the evaporation of aluminium and carbon particles in nitrogen on their radius are obtained. View full abstract»

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  • Diffraction feature and applications of holographic Bragg gratings

    Publication Year: 2010 , Page(s): 55 - 57
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1160 KB) |  | HTML iconHTML  

    Bragg character of a light diffraction on volume phase holographic gratings is considered as the basic of their applications in a number of classical and new optical instruments. Owing to high angular/spectral selectivity of the Bragg grating monochromators can be realised without application of input/output slits. Strengthening of an spectral dispersion due to the 3D-diffraction provides a single-mode oscillation in dye lasers even with nanosecond pumping. The polychromator with a such grating is attained in divergent “white” light beam in a plane of a grating dispersion. Two diffracted beams controlled power on a grating exit in a combination with the simple lens optics for beam crossing implement a 2-beam interferometer with controlled spatial resolution. Calibrated on a spatial frequency the grating on a goniometric knot forms the high-precision wavelengthmeter. High angular selectivity of such grating allows to implement optical vibration sensor with sensitivity comparable with that at modern seismographer. View full abstract»

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  • (110) quantum well based spin VCSELs

    Publication Year: 2010 , Page(s): 58 - 60
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (596 KB) |  | HTML iconHTML  

    A vertical-cavity surface-emitting laser (VCSEL) based on (110) InGaAs/GaAs multiple quantum wells (MQWs) was fabricated and characterized. Circularly polarized lasing by optical pumping was demonstrated. A high degree of circular polarization, 0.94, was observed at 77 K, reflecting the long electron spin relaxation time in the (110) MQWs. View full abstract»

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  • Dark resonances in rubidium atoms excited by optical comb

    Publication Year: 2010 , Page(s): 61 - 63
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (541 KB) |  | HTML iconHTML  

    In a three-level lambda system, a destructive interference between excitation pathways at laser excitation can provide the resonant reduction of fluorescence and absorption (“dark resonance”). The dark resonances in rubidium vapor excited by a femtosecond laser or laser with frequency shifted feedback have been studied theoretically and experimentally. View full abstract»

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  • 589nm high power sum-frequency generation with quasi-continuous-wave diode-pumped Nd:YAG lasers

    Publication Year: 2010 , Page(s): 64 - 66
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (994 KB) |  | HTML iconHTML  

    A 12.7 W 589 nm coherent light source with the linewidth of less than 1 GHz and the beam quality of M2 = 1.2 is achieved by extra-cavity sum-frequency mixing 1064 nm and 1319 nm quasi-continuous-wave diode-pumped Nd:YAG lasers with a LBO crystal. View full abstract»

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  • High power wavegude CO2 lasers for technologies and medicine

    Publication Year: 2010 , Page(s): 67 - 70
    Save to Project icon | Request Permissions | Click to expandQuick Abstract | PDF file iconPDF (1086 KB) |  | HTML iconHTML  

    The paper considers the recent advances in the development of the high-power (kilowatt-level) waveguide CO2 lasers meant for application in processing of various materials, specifically in precision cutting. The technical characteristics of the new three models of diffusion-cooled multichannel waveguide industrial CO2 lasers excited with acoustic-frequency ac discharge are presented. View full abstract»

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