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检索条件"任意字段=Conference on Nonlinear Optics and Applications IX"

共 53 条记录，以下是1-10 订阅

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Three wave mixing enhancement in metal-dielectric-metal nanostructures 9

引用

conference on nonlinear optics and applications ix

作者： Heron, S. Bouchon, P. Pardo, F. Baucour, A. Haidar, R. Off Natl Etud & Rech Aerosp F-91761 Palaiseau France CNRS LPN F-91460 Marcoussis France

ISBN: (纸本)9781628416244

nonlinear processes are investigated in plasmonic nanostructures which display Fabry-Perot resonances. This study focuses on the impact of the resonator geometry on the efficiency of second order effects implying 2 or 3 different wavelengths. These resonances heavily concentrate the electric field, allowing significant enhancement of the local nonlinear polarization and subsequently of the nonlinearly generated signals.

关键词： nonlinear optics Nanophotonics Three wave mixing Second Harmonic Generation

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Modal method for Second Harmonic Generation in nanostructures 9

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conference on nonlinear optics and applications ix

作者： Heron, S. Pardo, F. Bouchon, P. Pelouard, J. -L. Haidar, R. Off Natl Etud & Rech Aerosp F-91761 Palaiseau France CNRS LPN F-91460 Marcoussis France

ISBN: (纸本)9781628416244

Nanophotonic devices show interesting features for nonlinear response enhancement but numerical tools are mandatory to fully determine their behaviour. To address this need, we present a numerical modal method dedicated to nonlinear optics calculations under the undepleted pump approximation. It is briefly explained in the frame of Second Harmonic Generation for both plane waves and focused beams. The nonlinear behaviour of selected nanostructures is then investigated to show comparison with existing analytical results and study the convergence of the code.

关键词： Modal method Second Harmonic Generation B-splines Focusing nonlinear response Sparse matrices

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Self-pulsing in nonlinear Kerr-type coupled ring resonators with effect of loss 9

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conference on nonlinear optics and applications ix

作者： Eksioglu, Y. Petracek, J. Brno Univ Technol Fac Mech Engn Inst Engn Phys Tech 2 Brno 61669 Czech Republic Brno Univ Technol CEITEC Cent European Inst Technol Tech 10 Brno 61600 Czech Republic

ISBN: (纸本)9781628416244

We focus on dynamical analysis of nonlinear structures consisting of coupled ring resonators. We formulate a system of difference-differential equations that take into account non-instantaneous Kerr response and the effect of loss. The system is applied to investigation of a double-ring structure in the all-pass filter configuration. We observe rich dynamics, transitions from steady state to Hopf bifurcations and chaos. The system is highly sensitive for the values of detuning from resonance and input power. The influence of loss on oscillatory states is also presented.

关键词： ring resonator coupled cavities nonlinear optics optical bistability self-pulsing chaos

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Optical nanofiber facilitated nonlinear optics effects in cold atoms 9

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conference on nonlinear optics and applications ix

作者： Gokhroo, Vandna Kumar, Ravi Chormaic, Sile Nic Okinawa Inst Sci & Technol Grad Univ Light Matter Interact Unit Onna Okinawa 9040495 Japan Natl Univ Ireland Univ Coll Cork Dept Phys Cork Ireland

ISBN: (纸本)9781628416244

In this paper, we describe an experiment for two-photon excitation in laser-cooled Rb-87 using an optical nanofiber. A brief description of the multilevel atom scheme is followed by experimental results on two-photon absorption and observation of Autler-Townes splitting in cold atoms. These experiments use powers several orders of magnitude lower than those used in free space experiments.

关键词： Optical nanofibers laser-cooled atoms quantum interference effects Autler-Townes splitting frequency upconversion

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Optical nonlinearities induced by electric fields in nematic liquid crystals 9

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conference on nonlinear optics and applications ix

作者： Stoian, Victor Cirtoaje, Cristina Petrescu, Emil Motoc, Cornelia Univ Politehn Bucuresti RO-060042 Bucharest Romania

ISBN: (纸本)9781628416244

nonlinear phenomena induced by an electric field inside a nematic liquid crystal were studied. A planar oriented cell filled with 5CB nematic liquid crystal was subjected to an external voltage, higher than the threshold value for the Freedericksz transition, and a laser beam was sent perpendicular to the cell. Circular fringes appeared on the screen. The maximum number of diffraction fringes for different voltage values was measured and the experimental plot were in good agreement with theory. We performed a set of dynamic measurements of the fringes evolution from the moment when the laser beam was applied until the maximum number of fringes was reached, for each voltage, and the results were consistent with theoretical pattern.

关键词： nonlinear phenomena electric Freedericksz transition liquid crystal

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Coherent nonlinear Optical Microscopy for Acquiring Structural Information of Cell Cytoskeleton 9

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conference on nonlinear optics and applications ix

作者： Sharoukhov, D. Lim, H. CUNY Hunter Coll Dept Phys & Astron New York NY 10065 USA CUNY Grad Ctr New York NY 10065 USA

ISBN: (纸本)9781628416244

Second-harmonic generation (SHG) is a coherent nonlinear optical process occurring in non-centrosymmetric molecules, including microtubule (MT). MT is a cytoskeleton playing many important roles in a variety of cellular processes depending on the cell type, and the conformation is crucial for the function. Here we present the use of SHG process to probe MT cytoskeleton in living neuronal tissue. Polarization-resolved SHG (p-SHG) imaging and the second-order tensor analysis were performed on the retinal nerve fibers in order to probe the structure of MTs in axon. The polar anisotropy of tubulins was determined at the molecular level. The effect of MT-stabilizing drug Taxol was also examined and the induced changes were not detectable by p-SHG. Our results demonstrate SHG as a novel optical method to measure conformational changes of MTs in the native cellular context. The technique could be employed in conjunction with existing atomic-resolution methods of structural biology to improve our understanding of cytoskeleton dynamics in vivo.

关键词： nonlinear optics biomedical imaging biophysics cytoskeleton

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nonlinear scattering of ultrashort laser pulses on two-level system 9

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conference on nonlinear optics and applications ix

作者： Astapenko, Valery A. Sakhno, Sergey V. State Univ Moscow Inst Phys & Technol Dolgoprudnyi 141700 Moscow Region Russia

ISBN: (纸本)9781628416244

The presentation is devoted to the theoretical investigation of nonlinear scattering of ultrashort electromagnetic pulses (USP) on two-level quantum system. We consider the scattering of several types of USP, namely, so called corrected Gaussian pulse (CGP) and cosine wavelet pulse. Such pulses have no constant component in their spectrum in contrast with traditional Gaussian pulse. It should be noted that the presence of constant component in the limit of ultrashort pulse durations leads to unphysical results. The main purpose of the present work is the investigation of the change of pulse temporal shape after scattering as a function of initial phase at different distances from the target. Numerical calculations are based on the solution of Bloch equations and expression for scattering field strength via dipole moment of two-level system exposed by the action of incident USP. In our calculation we also account for the influence of refracting index of the air on electric field strength in the pulse after scattering.

关键词： scattering ultra short pulses nonlinear scattering corrected Gaussian pulse

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Investigations on growth, structure, optical properties and laser damage threshold of organic nonlinear optical crystals of Guanidinium L-Ascorbate 9

引用

conference on nonlinear optics and applications ix

作者： Saripalli, Ravi Kiran Kumar, Sanath Bhat, H. L. Elizabeth, Suja Indian Inst Sci Dept Phys Bangalore 560012 Karnataka India Ctr Nano & Soft Matter Sci Bangalore 560013 Karnataka India

ISBN: (纸本)9781628416244

Single crystals of Guanidinium L-Ascorbate (GuLA) were grown and crystal structure was determined by direct methods. GuLA crystallizes in orthorhombic, non-centrosymmetric space group P2(1)2(1)2(1). The UV-cutoff was determined as 325 nm. The morphology was generated and the interplanar angles estimated and compared with experimental values. Second harmonic generation conversion efficiency was measured and compared with other salts of L-Ascorbic acid. Surface laser damage threshold was calculated as 11.3GW/cm(2) for a single shot of laser of 1064 nm wavelength.

关键词： Organic nonlinear optical material crystal growth ORTEP diagram morphology Laue pump-probe setup Laser damage threshold

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Tunable nonlinear-optical devices for laser-spectroscopic sensing

Tunable nonlinear-optical devices for laser-spectroscopic se...

引用

conference on nonlinear Frequency Generation and Conversion - Materials, Devices, and applications ix

作者： Orr, Brian J. He, Yabai Macquarie Univ MQ Photon Res Ctr Sydney NSW 2109 Australia

ISBN: (纸本)9780819479785

Generating coherent light via nonlinear optics drives many of our laser-spectroscopic sensing applications. For instance, narrowband tunable pulsed optical parametric oscillators (OPOs) controlled by injection seeding are used extensively for cavity-ringdown and coherent-Raman spectroscopies. In a high-precision OPO-based spectroscopic system, we employ a long-pulse (>25 ns) pump laser with optical-heterodyne diagnostics to log instantaneous frequency and chirp on a pulse-by-pulse basis. In other work, we use photorefractive media for narrowband wavelength control of tunable diode lasers and pulsed OPOs. Additional prospective spectroscopic applications of tunable pulsed OPOs are also considered.

关键词： laser spectroscopy spectroscopic sensing optical parametric oscillator injection seeding

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Propagation of femtosecond pulse with self-similar shape in medium with non-linear absorption 9

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conference on nonlinear optics and applications ix

作者： Trofimov, Vyacheslav A. Zakharova, Irina G. Moscow MV Lomonosov State Univ Moscow 119992 Russia

ISBN: (纸本)9781628416244

We investigate the propagation of laser pulse with self-similar shape in homogeneous medium with variousmechanisms of nonlinear absorption: multi-photon absorption or resonant nonlinearity under detuning the frequency, corresponding to energy transition, from the current frequency of wave packet, or nonlinear absorption with its saturation. Both types of sign for frequency detuning are considered. This results in appearance of a refractive index grating which induced a laser pulse self-action. We analyze also the influence of the laser pulse self-modulation due to cubic nonlinearity on existence of the laser pulse propagation mode with self-similar shape. We develop an analytical solution of the corresponding nonlinear eigenfunction problem for laser pulse propagation in medium with nonlinear absorption. This solution is confirmed by computer simulation of the eigenfunction problem for Schrodinger equation with considered nonlinearity. This mode of laser pulse propagation is very important for powerful TW laser pulse propagating in glass.

关键词： femtosecond pulse nonlinear absorption resonant nonlinearity laser pulse frequency detuning from resonant frequency self-similar shape of pulse eigenvalue problem soliton

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