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Showing 1 to 14 of 14 for “"Coherent anti-stokes raman spectroscopy"”.
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Coherent anti-Stokes Raman spectroscopy of diamond
Experiments 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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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 …
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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
… normally 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 …
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Investigation of broadband laser spectral fluctuation to CARS
… dye 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 …
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Methodology For Validating Multi-Dimensional Engine Combustion Models And Fuel Surrogates Using An Optically Accessible Compression Ignition Engine
… on a McKenna Flat Flame Burner. Spectral and Coherent anti-Stokes Raman Spectroscopy (CARS) measurements are used to propose a value of α in the soot emissivity model.</p>
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Ultrafast Ultra-confined Plasmon Phonon Interactions
… mode” by performing ultrafast pump- probe spectroscopy on single constructs. Thorough finite element method simulations allow us to create a simple analytical model relat- ing the nanoparticle-substrate contact area to the bouncing mode period. This means that by measuring the bouncing mode …
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C.A.R.S. temperature measurements and chemical kinetic modelling of autoignition in a methanol-fuelled internal combustion engine
… knocking conditions, is measured by means of Coherent Anti-Stokes Raman Spectroscopy (CARS), and the pressure is measured with a pressure transducer. In order to obviate any errors arising from deficiencies in the spectral scaling laws which are commonly used to represent nitrogen Q-branch …
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Multi-pulse nonlinear optical spectroscopy and light-matter interactions in layered materials.
… to enhance nonlinear optical phenomena, such as Raman spectroscopy. Here, we have investigated four-wave mixing (FWM) processes in bulk MoS2 using a multiplex coherent anti-Stokes Raman spectroscopy setup. The observed FWM signal has a resonance at approximately 680 nm, corresponding to the …
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Development Of A Two-Color Optical Diagnostic For The Determination Of Engine In-Cylinder Soot Temperature And Volume Fraction Evolution With A Flame-Calibrated Emissivity Model
… thus very important to have the capability to quantify this parameter in-cylinder. Optical diagnostic techniques such as -- Rayleigh scattering, filtered Raman scattering (Doppler), Raman scattering, coherent anti-stokes Raman spectroscopy (CARS), vibrational thermally-assisted fluorescence, …
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Development of novel laser diagnostic techniques for the quantitative study of premixed flames
… was on the improvement and application of a coherent anti-Stokes Raman spectroscopy (CARS) setup to an acoustically-forced turbulent lean premixed flame stabilised on a burner, whose design was modelled to mimic phenomena of relevance in industrial combustors. In a related previous study …
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Mathematical modelling of premixed laminar methane-air flames
… and successfully validated with non-intrusive Coherent Anti-Stokes Raman Spectroscopy (CARS) temperature measurements. With the first model, the heat releaser ate model, volumetric heat release rate was generalised from one-dimensional computations. This approximation greatly simplified the set …
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Applications of femtosecond coherent anti-stokes Raman scattering in combustion
… development 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 …
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Fiber Laser Based Nonlinear Spectroscopy
To date, nonlinear spectroscopy has been considered an expensive technique and confined mostly to experimental laboratory settings. Over recent years, optical-fiber lasers that are highly reliable, simple to operate and relatively inexpensive have become commercially available, removing one of the …