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Understanding the quantum dynamics of the strongly driven dissipative system within the standard theory of quantum optics remains challenging due to the lack of a framework that considers the higher-order effect of the drive. On the other hand, recent developments in open systems provide a framework for investigating higher-order processes. In this context, this thesis aims to utilize the tools of open systems to explore the second-order effects of the drive, namely (i) the drive-induced dissipation and (ii) the drive-induced shifts to investigate the unexplored regimes of quantum optical phenomena that are difficult to explain using existing frameworks. Possible applications of higher-order processes in some fundamental areas of quantum optics, such as dark-state spectroscopy, Resonance fluorescence experiment, cavity quantum electrodynamics, etc., are investigated with feasible experimental proposals well within the current experimental reach. |