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Search theses and dissertations gathered from participating repositories worldwide. Every result links back to the library that holds it. No account is needed.
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Showing 1 to 20 of 60 for “"Anti-Stokes"”.
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Coherent anti-Stokes Raman spectroscopy of diamond
… were performed to investigate Coherent Anti-Stokes Raman Scattering (CARS) in diamond. Aspects of this type of non-linear scattering are presented theoretically, and various experimental configurations were attempted in order to study them. These included the dependence of the CARS …
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Applications of femtosecond coherent anti-stokes Raman scattering in combustion
… of chirped-probe-pulse femtosecond coherent anti-Stokes Raman spectroscopy (CPP fs-CARS) for applications of gas phase thermometry and extension to methane concentration measurements. The main effort has been to assess the usefulness and robustness of the technique in turbulent combustors of …
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The sol-gel synthesis of anti-stokes luminescent glass materials
… in the field of transparent glass materials with anti-Stokes luminescent properties are described. The literature has shown that rare earth doped oxide glasses, whilst chemically durable and relatively easy to manufacture, have weak anti-Stokes emissions, whereas rare earth doped fluoride …
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Developing Single-Laser Sources for Multimodal Coherent Anti-Stokes Raman Scattering Microscopy
Coherent anti-Stokes Raman scattering (CARS) microscopy has developed rapidly and is opening the door to new types of experiments. This work describes the development of new laser sources for CARS microscopy and their use for different applications. It is specifically focused on multimodal …
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Dynamics of Phonons in Crystals as Studied by Picosecond Coherent Anti-Stokes Raman Spectroscopy
… function. In this thesis the picosecond coherent anti-Stokes Raman (CARS) technique is applied to the study of intermolecular and intramolecular phonons in organic molecular crystals and ionic crystals. In conjunction with recent theoretical calculations on the phonon dynamics in naphthalene, the …
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Polarization Controlled Coherent Anti-Stokes Raman Scattering Microscopy for Determination of Structural Order of the Myelin Sheath
Coherent Anti-Stokes Raman Scattering (CARS) is a laser-scanning microscopy technique that generates a strong label-free signal in lipid. The myelin sheath surrounding nerves is up to 80% lipid, and therefore is an ideal candidate for CARS imaging. The long lipid chains forming the myelin wraps …
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Experimental Measurements of Pressure, Temperature, and Density Using High-Resolution N(2) Coherent Anti-Stokes Raman Scattering
… P/T/p measurements are compared to similar quantities extracted from a RANS CFD simulation. The agreement between the mean CARS measurements and CFD predictions along the jet centerline and radial traverses is generally excellent. This CARS technique is able to capture the low-pressure and …
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Experimental and Theoretical Investigations of Coherent Anti -Stokes Raman Scattering as a Nonintrusive Diagnostic for Gas -Phase Systems
The second portion of the work concerned the development of a theoretical model for electronic-resonance-enhanced CARS (ERE CARS) spectra of nitric oxide. This model incorporates the effects of the Raman resonance in conjunction with an electronic resonance to provide the first known theoretical …
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The use of coherent anti-Stokes Raman Spectroscopy as a diagnostic technique for studying the hydrogenation of carbon moxide in a tube-wall reactor
… associated with fixed bed reactors. Coherent Anti-Stokes Raman Spectroscopy (CARS) is a relatively new laser-based spectroscopic technique which may be used to obtain the concentrations of species in the gas phase. The aim of this work was to study the methanation reaction over various …
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Ultrafast Raman Scattering in Plasmonic Nanocavities
… This vibrational pumping leads to non-linear anti-Stokes scattering observable at room temperature. Further, the optomechanical coupling induces a red-shift of the vibrational energy by >100 cm<sup>−1</sup> and broadening of the Raman line at high peak laser powers (optomechanical spring …
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Raman scattering in free standing porous Si films
… are calculated by comparing intensities of Stokes and anti-Stokes Raman peaks. Compared to crystalline Si, we find strong decrease in thermal conductivity accompanied by a change in the phonon spectra. Also, comparing Stokes and anti-Stokes Raman spectra, we find that porous Si is a …
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Quantum applications of Raman-mediated photon-pair generation
… to generate photon pairs. Using the spontaneous Stokes Raman interaction, a photon from a strong pump laser pulse is annihilated, and a Stokes photon and Raman-mediated collective excitation are created. This excitation can then be read out deterministically as an anti-Stokes photon with the …
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Resonance Raman spectroscopy of single-walled carbon nanotubes
… Raman spectra, and unique features in the Stokes and anti-Stokes Raman spectra. The Raman tangential G-band feature associated with semiconducting nanotubes have a different characteristic lineshape than those associated with metallic carbon nanotubes. The differences in the electronic …
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Emissionsdetektierte Femtosekunden Spektroskopie an Polyatomaren Molekülen
… durch nicht-resonante anti-Stokes Raman Streuung nach ultraschnellen internen Konversion.
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Vibrational Dynamics in Disordered Molecular Crystals by Picosecond Coherent Raman and Photon Echo Spectroscopies (Exciton, Low Temperature)
… temperature by picosecond time-delayed Coherent Anti-Stokes Raman Scattering (psCARS) and photon echo spectroscopy (PE).
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Investigation of broadband laser spectral fluctuation to CARS
… laser with a view to reducing noise in Coherent Anti-Stokes Raman Spectroscopy (CARS). Combinations of three dyes and methods of quantifying noise in spectra are investigated. Correlations between groups of modes in the dye laser are shown to exist and vary from dye to dye. Investigation is made …
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Backward stimulated raman scattering
… for the steady state linewidth of the forward Stokes output in the presence of a depleted pump. The theory is developed with the aim of gaining an understanding of the mechanism which favours stimulated Raman output in the backward direction. The experimental investigation with hydrogen as the …
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