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Standards, Methods and Solutions of Metrology || Third-Order Nonlinear Optical Properties of Quantum Dots
摘要： Quantum dots (QDs) are semiconducting nanocrystalline particles. QDs are attractive photonic media. In this chapter, we introduce third-order nonlinear optical properties and a brief idea about the physics of QDs. Z-scan technique and theoretical analysis adopted to obtain nonlinear parameters will be discussed. Analysis of third-order nonlinear optical parameters for PbS QDs suspended in toluene with radii 2.4 and 5.0 nm under different excitation beam power level and three different wavelengths (488, 514, and 633 nm) will be detailed. Third-order optical susceptibility χ(3) and optical-limiting behavior of PbS QD suspended in toluene are presented. Irrespective of their size, QDs are a good example of optical limiters with low threshold.
关键词： Z-scan technique,semiconductor,nonlinear absorption coefficient,third-order optical susceptibility,quantum dot,optical limiting,nonlinear optics,optical switching,nonlinear index of refraction
更新于2025-09-16 10:30:52
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Stability of out-of-phase solitons and laser pulse self-compression in active multicore fibers
摘要： An out-of-phase soliton distribution of the wave ?eld is found for a multicore ?ber (MCF) from an even number of cores located in a ring. Its stability is proved with respect both to small wave-?eld perturbations, including azimuthal ones, and to small deformations of the MCF structure. As an example of using this soliton distribution, the problem of laser pulse compression in an active MCF is studied. The optimal ?ber parameters, the minimum duration of the output pulse, and the compression length are found, and they are in good agreement with the results of numerical simulation. In order to achieve high energies in the output laser pulse, the requirements for MCF deformations are determined.
关键词： fiber optics,laser pulse compression,soliton,multicore fiber,nonlinear optics
更新于2025-09-16 10:30:52
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Enhanced Nonlinearity and Engineered Anomalous Dispersion in ${\rm{TeO_{2}}}$-coated ${\rm{Si_{3}N_{4}}}$ Waveguides
摘要： We propose designs of silicon nitride (Si3N4) waveguides with enhanced nonlinear parameter and engineered anomalous group velocity dispersion (GVD) by addition of tellurium oxide (TeO2) top-coating layers of various thicknesses. The proposed waveguides have calculated nonlinear parameters of up to three times that of stoichiometric Si3N4 and exhibit anomalous GVD at near infrared wavelengths. The GVD of such waveguides can be tuned between the normal and anomalous regime with different zero dispersion wavelengths by adjusting the thickness of TeO2 coating. These designs offer promise of higher performance nonlinear devices on a standard low-loss Si3N4 platform with the possibility of integration of active functionalities owing to higher solubility of rare earth dopants in tellurium oxide.
关键词： silicon nitride,dispersion engineering,nonlinear optics,Integrated optics,tellurium oxide
更新于2025-09-16 10:30:52
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[IEEE 2019 IEEE Research and Applications of Photonics in Defense Conference (RAPID) - Miramar Beach, FL, USA (2019.8.19-2019.8.21)] 2019 IEEE Research and Applications of Photonics in Defense Conference (RAPID) - Quantum Yield Measurement of Organometallic Complexes using Double Pump Probe Technique
摘要： The abstract of the paper is not provided in the given text.
关键词： Nonlinear optics,optical nonlinearities in optical Materials,Nonlinear optical Material
更新于2025-09-16 10:30:52
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[IEEE 2019 18th International Conference on Optical Communications and Networks (ICOCN) - Huangshan, China (2019.8.5-2019.8.8)] 2019 18th International Conference on Optical Communications and Networks (ICOCN) - More-than-95-line fiber laser based on hybrid gain from the Brillouin effect and erbium-doped fiber
摘要： We demonstrate a multi-wavelength Brillouin fiber laser based on a dual-ring structure to take advantage of the forward and backward Brillouin gain simultaneously with an injected tunable scanning lasing. We used two erbium-doped fiber amplifiers for the amplification of the seed lasing and the operated Brillouin laser. The cascaded stimulated Brillouin effect in the section of dispersion-shifted fiber contributes to the free-oscillation suppression in cavity. When the laser operates at the center wavelength of 1565 nm, the output spectra shows the maximum Brillouin lines of more than 95 with a wavelength spacing of about 0.08 nm under the maximum pump. Through adjusting of the seed wavelength and the tunable filter in cavity, the output spectra can be shifted from 1540 to 1570 nm.
关键词： fiber nonlinear optics,Stimulated Brillouin scattering (SBS),Multi-wavelength fiber laser
更新于2025-09-16 10:30:52
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[IEEE 2019 International Conference on Optical MEMS and Nanophotonics (OMN) - Daejeon, Korea (South) (2019.7.28-2019.8.1)] 2019 International Conference on Optical MEMS and Nanophotonics (OMN) - Hybrid Dielectric Metasurfaces: From Strong Light-Matter Interaction to Extreme Nonlinearities
摘要： We experimentally demonstrate strong coupling between Mie modes of dielectric resonators in a metasurface and intersubband transitions in semiconductor quantum wells that are embedded inside the resonator. The ability to achieve such light-matter coupling creates the possibility to realize ultrathin nonlinear optical devices that are free from complex phase matching requirements and have very high nonlinear conversion efficiencies.
关键词： Rabi splitting,Intersubband transitions,Nonlinear optics,Semiconductor heterostructures,Metasurface
更新于2025-09-16 10:30:52
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Temporal profile measurements of ultrafast pulsed laser systems
摘要： Ultrafast pulsed lasers can be used to measure the phenomena occurring at femtosecond (fs) (10?15 s) time scale which include photo synthesis, protein collapsing and sub-atomic vibrations. In normal course, the temporal pro?le of the nanosecond (ns) pulsed lasers can be estimated by using the standard detectors because the recombination time of the electron-hole pair is of the order of ns. Nevertheless, the electronic equipment and the standard detectors are insuf?cient to measure the temporal pro?le of the ultrafast pulsed lasers. In the present investigation, we compare various techniques to measure the temporal pro?le of the ultrafast lasers which is followed by the details of the experimental con?guration of an autocorrelation technique. The temporal pro?le of the ultrafast pulsed lasers has shown various pulse width values in the experimental set-up when recorded at different con?gurations.
关键词： Second harmonic generation,Nonlinear optics,Autocorrelation measurement,Ultrafast spectroscopy,Ultrafast pulses
更新于2025-09-16 10:30:52
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[IEEE 2019 Conference on Lasers and Electro-Optics Europe & European Quantum Electronics Conference (CLEO/Europe-EQEC) - Munich, Germany (2019.6.23-2019.6.27)] 2019 Conference on Lasers and Electro-Optics Europe & European Quantum Electronics Conference (CLEO/Europe-EQEC) - Experimental Demonstration and Numerical Study of Plasmon-Soliton Waves
摘要： Merging the fields of plasmonics and nonlinear optics authorizes a variety of fascinating and original physical phenomena. In this work, we specifically study the combination of the strong light confinement ability of surface plasmon polaritons (SPP) with the beam self-trapping effect in a nonlinear optical Kerr medium. Although this idea of plasmon-soliton has been the subject of numerous theoretical papers since the eighties, up to now, no experimental evidence had been revealed yet. In the present study, a proper structure has been designed and fabricated allowing the first experimental demonstration of these hybrid nonlinear waves merging spatial solitons and SPP. To be able to trigger the nonlinearity at moderate light power and simultaneously to allow propagation over several millimeters, a multilayered dielectric-metal structure was first designed by modeling. It consists of a five-layer planar geometry made from a silicon wafer with a thick silica layer covered by a chalcogenide layer that is covered with a 10 nm silica layer followed by a gold film. Performed numerical simulations show that the main nonlinear TM modes of the designed planar waveguide exhibits a strongly enhanced Kerr self-focusing thanks to the plasmonic effect compared to the main TE nonlinear mode. The experimental analysis consists in injecting a typical 4×30 μm2 (FWHM) elliptical beam at 1.55 μm from a femtosecond laser into the 5 mm long structure. The output beam distribution evolution is then monitored versus input light intensity. The large trapping enhancement observed for a TM mode in presence of the plasmonic structure compared to configurations where the plasmonic effect is absent. For an input intensity of 1.17 GW/cm2 the beam is self-confined to a 12 μm FWHM while the FWHM is twice larger without plasmonic effect. The proposed plasmonic structure definitely exposes an enhanced self-focusing nonlinearity. The strong light confinement is due to the presence of the plasmon-soliton wave that propagates in the studied structures only for the TM polarization. Different configurations have been characterized and modeled as a function of beam input intensity that confirm the formation of these plasmon-soliton waves.
关键词： plasmon-soliton,surface plasmon polaritons,Kerr medium,plasmonics,nonlinear optics
更新于2025-09-16 10:30:52
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Optical Electronics (An Introduction) || 8. Fundamental of Nonlinear Optics
摘要： Nonlinear optics is an important branch of modern optics that emerged after the invention of laser. It covers the second, third, and higher-order nonlinear optic effects, and also studies some phenomena such as photorefractive effect and photon echo. In Section 8.2, we introduce the basic knowledge of nonlinear optics phase conjugate. Section 8.3 consider three-wave mixing as an example to discuss the second-order nonlinear optics effect. Sections 8.4 to 8.6 successively discuss the four-wave mixing, near-degenerate four-wave mixing, as well as harmonic oscillation four-wave mixing. In Section 8.8, we describe two kinds of elastic scattering that belong to the third order of nonlinear optics. Photon echo is a transient process along with a special nonlinear optics effect, Photorefractive phenomenon will be descripted in Sections 8.7 and 8.9. Phase conjugate waves can be produced in several nonlinear optics processes. Because phase conjugate wave can be used to correct distorted wavefront, it has important applications in laser nuclear fusion, lens-less imaging, and high-power, and high-light beam quality laser. These topics are also an important part of this chapter.
关键词： phase conjugate,Nonlinear optics,four-wave mixing,three-wave mixing,photon echo,photorefractive effect
更新于2025-09-16 10:30:52
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[IEEE 2019 Conference on Lasers and Electro-Optics Europe & European Quantum Electronics Conference (CLEO/Europe-EQEC) - Munich, Germany (2019.6.23-2019.6.27)] 2019 Conference on Lasers and Electro-Optics Europe & European Quantum Electronics Conference (CLEO/Europe-EQEC) - Self-Written Y-Junctions using Spatial Solitons
摘要： The self-focusing and the formation of spatial solitons attracted a great deal of attention since the early days of nonlinear optics. Essentially a high-power beam changes the refractive index, writing a waveguide capable to con?ne the beam itself. Accordingly, spatial solitons behave like optical waveguides for beams at different wavelength and low power, thus enabling the generation of integrated optical devices written by the light itself. Several all-optical devices have been demonstrated based on this principle, with particular attention devoted in the last two decades to nematic liquid crystals (NLCs) due to their huge nonlinear response. The main nonlinear mechanism in NLC for CW excitations is reorientational, that is, the extraordinary (e-) wave rotates the optical axis of the material, providing a focusing effect. Nonetheless, NLCs are also subject to a strong thermo-optical effect, typically yielding a defocusing effect for the e-wave. Here we demonstrate the excitation of couples of solitons with a single-humped beam caused by the interaction between reorientational and thermal nonlinearity.
关键词： thermal nonlinearity,nematic liquid crystals,reorientational nonlinearity,spatial solitons,nonlinear optics
更新于2025-09-16 10:30:52