diff options
| -rw-r--r-- | abstract.tex | 2 | ||||
| -rw-r--r-- | active_correction/chapter.tex | 23 | ||||
| -rw-r--r-- | introduction/chapter.tex | 23 |
3 files changed, 32 insertions, 16 deletions
diff --git a/abstract.tex b/abstract.tex index 5ef1404..1a1060d 100644 --- a/abstract.tex +++ b/abstract.tex @@ -10,7 +10,7 @@ This approach has several unique capabilities: \item resolving congested states \cite{ZhaoWei1999b, DonaldsonPaulMurray2008a} \item extracting spectra that would otherwise be selection-rule disallowed \cite{BoyleErinSelene2013b, BoyleErinSelene2014b}, - \item resolving fully coherent dyanmics \cite{PakoulevAndreiV2009a}, + \item resolving fully coherent dynamics \cite{PakoulevAndreiV2009a}, \item measuring coupling \cite{WrightJohnCurtis2011a}, and \item resolving ultrafast dynamics. % TODO: cite \end{denumerate} diff --git a/active_correction/chapter.tex b/active_correction/chapter.tex index f4447d0..30919cd 100644 --- a/active_correction/chapter.tex +++ b/active_correction/chapter.tex @@ -84,9 +84,24 @@ For this reason, SDC for split OPAs is a multidimensional problem, which in prin multi-dimensional acquisition to fully record. %
In practice, however, these corrections are recorded iteravely. %
-[ALTHOUGH ACTIVE, CAN SOMETIMES BE CORRECTED FOR IN POST: SEE WRIGHTTOOLS.OFFSET]
-
-[SDC IN CONTEXT OF WHITE LIGHT]
+White light sources are also interesting to consider in the context of spectral delay
+correction. %
+White light is typically quite chirped, with lower frequency (redder) colors traveling ahead of
+high frequency (bluer) colors. %
+Typically, white light might serve as a ``probe'' that interacts last with the sample. %
+If a scanning monochromator is used, spectral delay correction could be employed such that each
+color within the white light pulse arrives at the same delay. %
+If a fully coherent experiment is performed with chirped white light as one of the excitation
+pulses, the other pulses will provide a gating effect in time that isolates interaction from one
+frequency in the white pulse. %
+This is similar to the gating that is accomplished using ``delay 1'' in the TOPAS-C OPAs (see
+section ...). %
+By gating in this way, a \emph{frequency} axis along the white light dimension could be scanned
+using a delay stage. %
+COLORS' has taken this idea to it's logical conclusion, with support for ``OPAs'' that are actually
+controlled by delay stages, although the idea has not yet been realized in practice. %
+
+[DESCRIPTION OF FIGURE]
\begin{figure}
\includegraphics[width=0.45\textwidth]{"active_correction/sdc_before"}
@@ -98,6 +113,8 @@ In practice, however, these corrections are recorded iteravely. % \section{Poynting correction} % ==================================================================
+[CONTENT FROM KYLE SUNDEN]
+
\begin{figure}
\caption[CAPTION TODO]{
CAPTION TODO: POYNTING CORRECTION FIGURE
diff --git a/introduction/chapter.tex b/introduction/chapter.tex index 285bd14..4d1a566 100644 --- a/introduction/chapter.tex +++ b/introduction/chapter.tex @@ -101,13 +101,12 @@ WrightTools is made to be extended, so it will continue to evolve along with its From an instrumental perspective, MR-CMDS is a problem of calibration and coordination. %
Within the Wright Group, each of our two main instruments are composed of roughly ten actively
moving component hardwares. %
-Many of these components are purchased directly from vendors such as SpectraPhysics, National
-Instruments, Horiba, Thorlabs, and Newport. %
-Others are created or heavily modified by graduate students. %
+Many of these components are purchased directly from commercial vendors, while others are created
+or heavily modified by graduate students. %
The Wright Group has always maintained custom acquisition software packages which control the
complex, many-stepped dance that these components must perform to acquire MR-CMDS spectra. %
-When I joined the Wright Group, I saw that acquisition software was a real barrier to experimental
+When I joined the Wright Group, I saw that acquisition software was a barrier to experimental
progress and flexibility. %
Graduate students had ideas for instrumental enhancements that were infeasible because of the
challenge of incorporating the new components into the existing software ecosystem. %
@@ -126,7 +125,7 @@ This has enabled graduate students to add and remove hardware whenever necessary about a heavy additional programming burden. %
PyCMDS is now used to drive both MR-CMDS instruments in the Group, allowing for easy sharing of
component hardware and lessening the total amount of software that the Group needs to maintain. %
-Besides being more flexible, PyCMDS solves a number of other problems. %
+Besides being more flexible than prior software, PyCMDS solves a number of other problems. %
It offers fully automated strategies for calibrating component hardwares, making calibration less
arduous and more reproducible. %
It offers more fine-grained control of data acquisition and timing, enabling more complex
@@ -138,9 +137,8 @@ Like any analytical technique, MR-CMDS is subject to artifacts: features of the caused by instrumental imperfections or limitations, and do not reflect the intrinsic material
response that is of interest. %
% JCW: HOW THE EXPERIMENT WAS DONE, NOT WHAT IT IS HOPING TO MEASURE
-For example, consider absorptive effects \cite{CarlsonRogerJohn1989a}, pulse effects
-\cite{SpencerAustinP2015a}, and window contributions \cite{MurdochKiethM2000a}: all well-known
-artifacts in CMDS. %
+For example, consider well-known artifacts such as absorptive effects \cite{CarlsonRogerJohn1989a},
+pulse effects \cite{SpencerAustinP2015a}, and window contributions \cite{MurdochKiethM2000a}. %
Since MR-CMDS is a very active experiment, with many moving motors, an active approach to artifact
correction is particularly appropriate. %
Chapter \ref{cha:act} describes strategies for implementing such corrections. %
@@ -149,7 +147,7 @@ at the same time. % Dual chopping can correct for scatter and other unwanted processes, ensuring that the observed
signal depends on all of the excitation beams. %
Fibrillation can wash out interference between desired and undesired processes, and is
-complementary with chopping. %
+complementary to chopping. %
Automated poynting correction and power correction can account for non-idealities in OPA
performance. %
@@ -160,12 +158,13 @@ Resonant responses are impulsive, like a hammer hitting a bell. % The impulsive limit is particularly well suited for describing time domain experiments. %
In the driven limit, pulses are narrow in frequency and long in time compared to material
response. %
-Resonant responses are driven, like a jello dessert sitting on a washing machine. %
+Resonant responses are driven, like a jiggling jello dessert sitting on a washing machine. %
The expected spectrum in both of these limits can be computed analytically. %
Things get more complicated in the mixed domain, where pulses have similar bandwidth as the
material response. %
Experiments in this domain are a practical necessity as CMDS addresses systems with very fast
-dephasing times. \cite{SmallwoodChristopherL2016a, PerlikVaclav2017a} %
+dephasing times. \cite{SmallwoodChristopherL2016a, PerlikVaclav2017a} % BJT: connect bw and
+ % dephasing
At the same time, the marginal resolution in frequency \emph{and} time that the mixed domain
possess promises huge potential in pathway resolution and decongestion.
\cite{PakoulevAndreiV2009a} %
@@ -208,7 +207,7 @@ Despite challenges in software, hardware, and theory MR-CMDS is a crucial tool i scientists. %
This dissertation describes several ways to make MR-CMDS more accessible through software and
hardware development. %
-PyCMDS has made data collection faster and more artifact-free. %
+PyCMDS has enabled new experiments, and has made data collection faster and more artifact-free. %
WrightTools has trivialized data processing, tightening the loop between idea and execution. %
Theory can be used to guide experimental insight in the promising, if challenging, mixed domain. %
Applications of these ideas in three materials are presented. %
|