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Diffstat (limited to 'opa_phase')
| -rw-r--r-- | opa_phase/430 seconds.png | bin | 0 -> 220783 bytes | |||
| -rw-r--r-- | opa_phase/chapter.tex | 35 | ||||
| -rw-r--r-- | opa_phase/cross interference.png | bin | 0 -> 180297 bytes |
3 files changed, 35 insertions, 0 deletions
diff --git a/opa_phase/430 seconds.png b/opa_phase/430 seconds.png Binary files differnew file mode 100644 index 0000000..e9c5cf5 --- /dev/null +++ b/opa_phase/430 seconds.png diff --git a/opa_phase/chapter.tex b/opa_phase/chapter.tex new file mode 100644 index 0000000..774ab45 --- /dev/null +++ b/opa_phase/chapter.tex @@ -0,0 +1,35 @@ +\chapter{Abandon the random phase approximation} \label{cha:rpa} + +Recently we've made some measurements that seem to imply phase stability between the fs OPAs. % +We've typically assumed that the OPAs have random phase on every shot, making coherent heterodyne +processes average to zero. % +These measurements show that this is a very bad assumption. % + +I've taken the interferogram of OPA1 vs OPA2, Clearly the OPAs remain phase locked for many shots. % +In 'over time' I show the spectral phase pattern (D = 500 fs) for 1000 single shot acquisitions +over 430 seconds in lab time. % +The phase does drift, but it is certainly not quickly randomized. % + +I have more data showing: +How the spectral phase changes over the course of hours. +How the phase evolves as we scan the OPAs against each-other in color. +The reproducibility of phase as the OPA motors move away and then return to a given color. + +I'll work this data up and send out another email with many more details and thoughts once I have +time. % +This quick note is just to let the group know that we must abandon the 'random phase' assumption +when thinking about what heterodyne processes can happen as coherent artifacts. % + +\begin{figure} + \includegraphics[width=\textwidth]{"opa_phase/cross interference"} + \caption[CAPTION TODO]{ + CAPTION TODO + } +\end{figure} + +\begin{figure} + \includegraphics[width=\textwidth]{"opa_phase/430 seconds"} + \caption[CAPTION TODO]{ + CAPTION TODO + } +\end{figure} diff --git a/opa_phase/cross interference.png b/opa_phase/cross interference.png Binary files differnew file mode 100644 index 0000000..8891214 --- /dev/null +++ b/opa_phase/cross interference.png |
