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Showing 1 to 11 of 11 for “"Nonlinear refractive index"”.
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Time domain measurement of the nonlinear refractive index in optical fibers and semiconductor film
A new technique to measure the nonlinear refractive index n_2 in optical fibers and semiconductor films has been developed. It is based on the time delay two-beam coupling of very intense picosecond laser pulses that have been self-phase modulated in the nonlinear optical medium. The two beams are …
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Measurement of the nonlinear refractive index (n2) and stimulated Raman scattering in optical fibers as a function of germania content, using the photorefractive beam coupling technique
… the understanding and control of optical fiber nonlinearities. While these nonlinearites limit the power handling capacity of optical fibers and can cause noise, signal distortion and cross talk in optically amplified transmission systems, they have been equally harnessed for the development of …
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Colloidal semiconductor quantum dots : from synthesis to photonic applications
… the project was to investigate whether the high nonlinear refractive index can be used in photonic devices on a silicon platform. The colloidal Qdot synthesis typically produces a suspension of particles, stabilized by organic ligands. Understanding the nature and dynamics of this ligand shell is …
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Časově rozlišená laserová spektroskopie nanomateriálů
This diploma thesis is oriented to study of nonlinear properties of semiconductor nanocrystals using ultrashort femtosecond pulses. There is a detailed description of theory and experimental setup of the z-scan method, which can be used to measure the nonlinear refractive index and the two-photon …
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Nonlinear optical properties of novel nanostructured ion implanted laser ablated silicon using femtosecond pulse excitation
The study of the nonlinear optical properties of novel nanostructured ion implanted and laser ablation of Silicon is motivated by the need for materials that exhibit large values of the real part of the third order nonlinear susceptibility ([chi]^{(3)}_{Re}). This property is essential for light …
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Measuring Nonlinear Properties of Graphene Thin Films Using Z-Scan Technique
<p>The nonlinear studies of two-dimensional (2D) nanomaterials, specifically graphene, are very significant since graphene is finding its usefulness in handling the enormous heat in nanoscale high-density power electronics. Graphene has emerged to be a promising nanomaterial as an excellent heat …
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Laser-induced plasmas in air for pulsed broadband cavity-enhanced absorption spectroscopy
… ≈ −3.1 cm) by the LIP as a result of a localised nonlinear refractive index change induced by the high temperatures and strong electric fields associated with the LIP. This time-dependence was observed to be dependent on both the mirror separation and the pulse duration of the LIP formation laser. …
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Optical properties and thermal conductivity of resistive Au nanogranular films
… nanogranular gold films, namely their linear and nonlinear optical properties and their thermal conductivity. The linear optical properties were observed using femtosecond transient absorption spectroscopy (fTAS) and their film morphology was explored with atomic force microscopy. The switch …
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Nonlinear Optical Response of Simple Molecules and Two-Photon Semiconductor Lasers
… investigates two long standing issues in nonlinear optics: complete characterization of the ultrafast dynamics of simple molecules, and the potential of a two-photon laser using a bulk semiconductor gain medium. Within the Born-Oppenheimer approximation, nonlinear refraction in molecular …
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White Light Continuum for Broadband Nonlinear Spectroscopy
… is to develop a WLC for the purpose of broadband nonlinear spectroscopy and use it in spectroscopic measurements. The ability to generate a high-quality, high-spectral-irradiance source of radiation confined in a single beam that spans the visible and near-infrared spectral regimes has great …
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Nonlinear Applications using Silicon Nanophotonic Wires
This thesis is concerned with an emerging set of nonlinear-optical applications using silicon nanophotonic "wires" fabricated on a silicon-on-insulator photonic chip. These deeply scaled silicon nanophotonic wires are capable of confining the telecom and mid-infrared (mid-IR) light tightly into an …