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% graduate school requirement: less than 350 words
\chapter*{Abstract}
\addcontentsline{toc}{chapter}{Abstract}
Coherent multidimensional spectroscopy (CMDS) encompasses a family of experimental strategies
involving the nonlinear interaction between electric fields and a material under investigation. %
This approach has several unique capabilities: 1. resolving congested states [CITE KLUG], 2.
extracting spectra that would otherwise be selection-rule disslowed [CITE BOYLE], 3. resolving
fully coherent dyanmics [CITE], 4. measuring coupling [CITE], and 5. resolving ultrafast dynamics
[CITE]. %
CMDS can be collected in the frequency or the time domain, and each approach has advantages and
disadvantages. %
Frequency domain ``Multi-resonant'' CMDS (MR-CMDS) requires pulsed ultrafast light sources with
tunable output frequencies. %
These frequency-tunable pulses are directed into a material under investigation. %
The pulses interact with the material, and due to the specific interference between the multiple
fields the material is driven to emit a new pulse: the MR-CMDS signal. %
This new pulse may be different in frequency from the input pulses, and it may travel in a new
direction depending on the exact experiment being performed. %
The MR-CMDS experiment involves tracking the intensity of this output signal as a function of
different properties of the excitation pulses. %
These properties include 1. frequency 2. relative arrival time and separation (delay) 3. fluence
[CITE Z-SCAN], and 4. polarization [CITE KLUG], among others. %
Thus MR-CMDS can be thought of as a multidimensional experimental space, where experiments
typically involve explorations in one to four of the properties above. %
Because MR-CMDS is a family of related-but-separate experiments, each of them a multidimensional
space, there are special challenges that must be addressed when designing a general-purpose MR-CMDS
instrument. %
These issues require development of software, hardware, and theory. %
Five different improvements to MR-CMDS are presented in \hyperref[prt:development]{Part II:
Development}: 1. processing software (\autoref{cha:pro}), 2. acquisition software
(\autoref{cha:aqn}) 3, active artifact correction ([REF]), 4. automated OPA calibration
(\autoref{cha:opa}), and 5. finite pulse accountancy (\autoref{cha:mix}). %
\hyperref[prt:background]{Part I: Background} introduces relevant literature which informs on this
development work. %
Finally, \hyperref[prt:applications]{Part III: Applications} presents three examples where these
instruments, with these improvements, have been used to address chemical questions in
semiconductor systems. %
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