Thermal lens spectrometry using Gaussian and Laguerre Gaussian modes of excitation

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The dissertation introduces a Thermal Lens spectrometry model utilizing Laguerre Gaussian excitation for sample analysis. It details calculations of refractive index and temperature gradient profiles, contrasting these findings with those derived from fundamental Gaussian mode. The study reveals significant alterations in the refractive index near the propagation axis and an enhancement radially, which could greatly improve the sensitivity of the spectrometry technique.