From 0f87beb9b3cbf8447f4850be0eb9874e9c4fb64f Mon Sep 17 00:00:00 2001
From: Blaise Thompson <blaise@untzag.com>
Date: Sun, 15 Apr 2018 16:11:28 -0500
Subject: 2018-04-15 16:11

---
 introduction/chapter.tex | 30 ++++++++++++++++++++----------
 1 file changed, 20 insertions(+), 10 deletions(-)

(limited to 'introduction/chapter.tex')

diff --git a/introduction/chapter.tex b/introduction/chapter.tex
index f6adc46..b3d9df5 100644
--- a/introduction/chapter.tex
+++ b/introduction/chapter.tex
@@ -16,10 +16,10 @@
 
 Coherent multidimensional spectroscopy (CMDS) is a family of experimental strategies capable of
 providing unique insights into microscopic material physics.  %
-It is similar to more familiar multidimensional NMR experiments \cite{ZhaoWei2000b,
-  PakoulevAndreiV2006a}, although the implementation is different due to differences between the
-behavior of nuclear spin states (probed by NMR) and electronic and vibrational states (probed by
-CMDS).  %
+It is similar to more familiar multidimensional NMR experiments \cite{KeustersDorine1999a,
+  ZhaoWei2000b, PakoulevAndreiV2006a}, although the implementation is different due to differences
+between the behavior of nuclear spin states (probed by NMR) and electronic and vibrational states
+(probed by CMDS).  %
 CMDS can resolve couplings between states, and can decongest spectra by taking advantage of
 dimensionality and selection rules.  %
 With the advent of ultrafast lasers, CMDS can resolve dynamics in excited states and the coupling
@@ -146,6 +146,16 @@ complementary to chopping.  %
 Automated poynting correction and power correction can account for non-idealities in OPA
 performance.  %
 
+MR-CMDS instruments rely on OPAs as tunable light sources.  %
+OPAs are very sensitive to changes in upstream lasers and lab conditions, so OPA tuning is
+regularly required.  %
+Manual OPA tuning can easily take a full day of human effort. %
+Furthermore, manual tuning typically results in inferior tuning curves, since it is difficult for
+humans to consider all available information simultaneously.  %
+Automated OPA tuning makes OPA upkeep easier, faster and more reproducible, facilitating higher
+throughput, higher quality frequency domain experiments. %
+Chapter \ref{cha:opa} describes fully automated tuning algorithms which I have developed.  %
+
 The theory that is used to describe CMDS is typically derived in one of two limits.  %
 In the impulsive limit, pulses are broad in frequency and short in time compared to material
 resonances.  %
@@ -183,8 +193,8 @@ They are easy to synthesize, store and prepare in the solution phase, and they h
 relatively narrow band-edge excitons which are easy to interrogate using MR-CMDS.  %
 In \autoref{cha:pss}, we describe a simple approach to extracting the quantitative third-order
 susceptibility of PbSe quantum dots using MR-CMDS.  %
-Using a simple approach of standard dilutions, we define this susceptibility in ratio to the known
-well-quantified susceptibility of our solvent and cuvette windows.  %
+Using standard dilutions, we define this susceptibility in ratio to the known well-quantified
+susceptibility of our solvent and cuvette windows.  %
 A few-parameter model is employed to extract this ratio.  %
 We are optimistic that this approach will be generally applicable, making it simple to perform
 quantitative solution-phase MR-CMDS.  %
@@ -213,23 +223,23 @@ frequency-frequency-delay transient grating spectroscopy to understand the basic
 dynamics of MoS\textsubscript{2}.  %
 We show that the band-edge excitons of MoS\textsubscript{2} are not easily resolved, and the
 dynamics of MoS\textsubscript{2} are fast.  %
-We develop a picture of MoS\textsubscript{2} electronic states that is consistent with our
+We describe a picture of MoS\textsubscript{2} electronic states that is consistent with our
 results.  %
 
 In \autoref{cha:pps} we use MR-CMDS to interrogate the dynamics of electronic states of
-(PEDOT:PSS).  %
+PEDOT:PSS.  %
 PEDOT:PSS is a transparent, electrically conductive polymer.  %
 The exact origin of the conductivity is not well understood, so it is unclear how to improve the
 conductivity or synthesize other conductive polymers.  %
 We performed photon echo experiments on PEDOT:PSS, directly interrogating the electronic states
-that are responsible for conductivity in the polymer.  %
+that are speculated to participate in conductivity.  %
 Using a sophisticated model extended from the work in \autoref{cha:mix}, we constrain the pure and
 ensemble dephasing lifetimes of PEDOT:PSS.  %
 These lifetimes can be directly related to the homogeneous and inhomogeneous broadening parameters
 in PEDOT:PSS.  %
 Amazingly, we find that PEDOT:PSS has very broad homogeneous \emph{and} inhomogeneous
 linewidths.  %
-We cannot constrain either quantity, but we can put lower limits on both.  %
+We cannot fully determine either quantity, but we can put lower limits on both.  %
 This basic information is complementary to other experiments in the ongoing effort to fully
 understand PEDOT:PSS.  %
 
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