From 2bb70d88086d0150a270a79ccc268c8bbb493024 Mon Sep 17 00:00:00 2001
From: Blaise Thompson <blaise@untzag.com>
Date: Wed, 7 Mar 2018 18:07:43 -0600
Subject: 2018-03-07 18:07

---
 procedures/chapter.tex | 630 +++++++++++++++++++++++++++++++++++++++++++++----
 1 file changed, 583 insertions(+), 47 deletions(-)

(limited to 'procedures/chapter.tex')

diff --git a/procedures/chapter.tex b/procedures/chapter.tex
index fcac88e..fd04bc3 100644
--- a/procedures/chapter.tex
+++ b/procedures/chapter.tex
@@ -1,54 +1,81 @@
 \chapter{Procedures}
 
 \clearpage
-\section{Starting the Millenia V CW LASER.}
+\section{``Six-month'' maintenance}  % ------------------------------------------------------------
 
-The Millennia has problems with ‘thermal runaway’ upon startup if a user naively sends the laser to
-4.0 W in power mode (thermal runaway causes the infamous FAULT 146 system shut off, power adjust
-timeout error).  %
-The following procedure wakes the Millenia up gently enough to prevent thermal runaway.  %
-It assumes that the Millenia starts completely shutdown and cold.  %
+The laser system that the Wright Group's MR-CMDS instruments use requires regular maintenance.  %
+Each component is sensitive to lab conditions such as temperature, humidity, and vibrations.  %
+Small deviations in upstream components can cause large problems in downstream optics.  %
+Regular maintenance involves ``tune-up'' of upstream components so that upstream lasers function
+well and ideally couple into downstream lasers.  %
+
+Historically, the Wright Group has engaged in reactive maintenance: a ``fix it if it's broken,
+don't touch otherwise'' kind of approach.  %
+This approach makes a lot of sense for instruments that are quick to fix, and have few active
+users.  %
+
+I instituted a proactive, regular maintenance procedure (described below) that has improved the
+predictability of instrumental performance.  %
+Predictability is key for instruments with multiple users.  %
 
+Supplies needed:
 \begin{denumerate}
-  \item Check desiccant inside Millenia, replace if pink.
-  \item Ensure that Millenia shutter is closed such that no light is going downstream.  %
-  \item Flip orange power switch on diode box.
-  \item Wait for system to warm up ($\sim$30 minutes).
+  \item 5 gallons distilled water.
+  \item Filters.
     \begin{denumerate}
-      \item ``System Warming Up'' message should appear on control box.
-      \item Warm-up is finished when percentage complete indicator reaches 100.
-      \item The Millenia will start in SP Current mode.
+      \item 2x 5 micron Liquatec SDF-25-0505
+      \item 2x 20 micron general purpose water filter (sold in stockroom)
     \end{denumerate}
-  \item Record diode hours (choose ``Info'', scroll down).
-  \item Turn Millennia to 1.0 W in ``power mode'', wait for equilibration.
+  \item Nalco fluids.
+    \begin{denumerate}
+      \item 4 gallons Nalco 460-PCCL104 (the pink stuff).
+      \item 1 gallon Nalco 460-CCL2567 (the clear stuff).
+    \end{denumerate}
+  \item 150x 5 mg activated charcoal packets (Newport Part \# 90035762) 
 \end{denumerate}
 
-
-Turn Millennia to 1.0 W in “power mode”, wait for it to equilibrate. This entails the diode temperature and current being stable (within 0.1) over 5 minutes.
-Turn Millennia to “current mode”.
-Slowly ramp current until you have ~4 W (or more) (~70%)
-Allow the diode temperature to stabilize while remaining in “current mode” (check every 5 minutes until it doesn't change by more than 0.1)
-Turn Millennia to 4.0 W “power mode”.
-Wait 10 minutes for extra assurance of equilibration.
-Ensure again that temperature and current are not changing (over ~5 minute timescale).
-Measure and record actual Millenia output power, currents, temperatures. 
-These data should be recorded in the GoogleSheet document for Millennia.
+Procedure:
+\begin{denumerate}
+  \item Turn off all lasers in lab.
+  \item In no particular order:
+    \begin{ditemize}
+      \item Computers in lab.
+        \begin{denumerate}
+          \item Backup contents.
+          \item Uninstall unnecessary software.
+          \item Update all necessary software.
+          \item Restart.
+        \end{denumerate}
+      \item Chiller maintenance.
+        \begin{ditemize}
+          \item See x
+          \item See y
+          \item See z
+        \end{ditemize}
+      \item Lab cleaning.
+        \begin{denumerate}
+          \item Mop the floor, trying to get as much dust as possible. Sweeping in the laser lab is
+            discouraged, because it knocks more dust into the air and onto the lasers.
+          \item Take out trash.
+          \item Empty homeless cables box.
+          \item Empty homeless screws box.
+          \item Organize any cabling mess.
+          \item Remove unused components (optics, electronics, cabling, etc) from laser tables and
+            surroundings. Place into appropriate locations.
+          \item Organize optics cabinet.
+          \item Organize electronics bench.
+        \end{denumerate}
+    \end{ditemize}
+  \item Let lab sit overnight to allow dust to settle and the air to dehumidify.
+  \item Start up system again.
+    \begin{denumerate}
+      \item TODO
+    \end{denumerate}
+\end{denumerate}
 
 \clearpage
-\section{Calibrating the 407A}
+\section{Lytron Kodiak RC006}  % ------------------------------------------------------------------
 
-Calibrating the 407.A
-
-You may sometimes notice that the zero position changes dramatically from sensitivity to
-sensitivity with the 407A. If this happens, iterate through the following until zero stays
-consistent:
-
-Use the fine adjust (knob on side) to zero the 407A on the highest sensitivity
-
-Use the front adjust (flathead screwdriver needed) to zero on the lowest sensitivity
-
-\clearpage
-\section{Lytron Kodiak RC006
 We have one Lytron Kodiak RC006: Model Number RC006G03BB1C002, Serial Number 739383-02.
 
 Regular chiller maintenance:
@@ -83,7 +110,7 @@ Ideally the pressure drop across this loop is sufficient to still drive fluid th
 % TODO: figure
 
 \clearpage
-\section{PolyScience 6000 Series}
+\section{PolyScience 6000 Series}  % --------------------------------------------------------------
 
 We own two PolyScience chillers---different models but functionally equivalent.
 
@@ -115,25 +142,534 @@ Regular chiller maintenance:
     \end{denumerate}
 \end{denumerate}
 
-% TODO: figure
-
 \clearpage
-\section{NesLab Merlin M33}
+\section{NesLab Merlin M33}  % ====================================================================
+
+We have one NesLab Merlin M33 Chiller, Serial Number 106227049.  %
+
+This chiller serves four different lasers on the ultrafast system.  %
+The cycle goes chiller out $\rightarrow$ Millennia $\rightarrow$ Tsunami $\rightarrow$ Spitfire Ace
+$\rightarrow$ Spitfire Pro $\rightarrow$ chiller return.
+
+Regular chiller maintenance
+\begin{denumerate}
+  \item Gather supplies.
+  \item Drain system completely.
+  \item Clean chiller internals.
+  \item Disconnect tubing, plug return.
+  \item Remove old filter from chiller, discard, replace filter holder.
+  \item Drain system completely and flush with several gallons of distilled water (should require
+    2), until no suds are formed as new water goes through system.
+  \item Fill system with one gallon distilled water, circulate for at least 15 minutes, then drain
+    completely.
+  \item Place new filter into chiller.
+  \item Reconstruct tubing to include lasers in cycle. Ensure that cycle direction is correct.
+  \item Fill system with one gallon Nalco 460-PCCL104 (the pink stuff).
+  \item Turn chiller on, and allow system to flow for a while to get air bubbles out.
+  \item Top off with distilled water until chiller and tubing is full.
+\end{denumerate}
+
+% TODO: figures
 
 \clearpage
-\section{Aligining TOPAS-C}
+\section{Calibrating the 407A}  % =================================================================
+
+Calibrating the 407.A
+
+You may sometimes notice that the zero position changes dramatically from sensitivity to
+sensitivity with the 407A. If this happens, iterate through the following until zero stays
+consistent:
+
+Use the fine adjust (knob on side) to zero the 407A on the highest sensitivity
+
+Use the front adjust (flathead screwdriver needed) to zero on the lowest sensitivity
 
 \clearpage
-\section{Aligning Spitfire PRO}
+\section{Millenia}  % =============================================================================
+
+\subsection{Startup}  % ---------------------------------------------------------------------------
+
+The Millennia has problems with ‘thermal runaway’ upon startup if a user naively sends the laser to
+4.0 W in power mode (thermal runaway causes the infamous FAULT 146 system shut off: power adjust
+timeout error).  %
+The following procedure wakes the Millenia up gently enough to prevent thermal runaway.  %
+It assumes that the Millenia starts completely shutdown and cold.  %
+
+\begin{denumerate}
+  \item Check desiccant inside Millenia, replace if pink.
+  \item Ensure that Millenia shutter is closed such that no light is going downstream.  %
+  \item Flip orange power switch on diode box.
+  \item Wait for system to warm up ($\sim$30 minutes).
+    \begin{denumerate}
+      \item ``System Warming Up'' message should appear on control box.
+      \item Warm-up is finished when percentage complete indicator reaches 100.
+      \item The Millenia will start in SP Current mode.
+    \end{denumerate}
+  \item Record diode hours (choose ``Info'', scroll down).
+  \item Turn Millennia to 1.0 W in ``power mode'', wait for equilibration.
+    \begin{ditemize}
+      \item Equilibration occurs when diode temperature and current are stable (within 0.1) over 5
+        minutes.  %
+    \end{ditemize}
+  \item Switch Millennia to ``current mode''.  
+  \item Slowly ramp current until you have more than 4 W output (probably $\sim$70\%).
+  \item Again, wait for diode temperature and current equilibration.
+  \item Switch Millennia to ``power mode'' at 4.0 W.
+  \item Ensure one last time that diode temperature and current are not changing over 5 minute
+    timescale.
+  \item Measure and record actual Millenia output power, currents, temperatures.
+\end{denumerate}
+
+\subsection{Toggling service mode}  % -------------------------------------------------------------
+
+On the control board inside the laser, DIP switch \#4 toggles service mode.  %
+Service mode unlocks special SP modes.  %
+These allow us to record things like Diode hours.  %
+Service mode can be buggy, so it's best to leave the Millenia in normal Power mode during regular
+operation.  %
 
 \clearpage
-\section{Air Handling}
+\section{Spitfire Pro}  % =========================================================================
+
+Only tune up the Spitfire if you need to, and do not treat it casually---set aside an entire
+day.  %
+Merely opening the spitfire box exposes the optics to dust.  %
+Treating the Spitfire with the respect it deserves will only save time in the long run.  %
+
+The Spitfire contains 70 charcoal packets.  %
+These should be replaced every $\sim$6 months.  %
+
+\subsection{Startup}  % ---------------------------------------------------------------------------
+
+Spitfire Pro startup procedure, from cold.
+
+\begin{denumerate}
+  \item Ensure that the software is closed on control laptop.
+  \item Turn on Empower power supply (orange switch).
+  \item Turn on Timing and Delay Generator ``TDG'' (orange switch).
+  \item Turn on temperature control box (orange switch).
+  \item Turn key on Empower power supply.
+  \item Turn key on TDG.
+  \item Start Spitfire software.
+    \begin{ditemize}
+      \item Often have many faults, most will clear immediately.
+      \item Empower LBO temp fault may take a while to clear---normally clears after 5 minutes.
+    \end{ditemize}
+  \item If Empower has been off (totally, or just at zero amps), warm up at 20 Amps for 1 hour.
+    \begin{ditemize}
+      \item Use a \textit{good} beam block to block entry into the Cavity during this time.  % TODO: figure
+    \end{ditemize} 
+\end{denumerate}
+
+\subsection{Common alignment}  % ------------------------------------------------------------------
+
+\subsubsection{Preparation}
+
+\begin{denumerate}
+  \item Check desiccant in temperature control box (blue is good, pink is bad).
+  \item Connect the fast oscilliscope so that you can see the pulse train.
+  \item If Spitfire is off, go through startup procedure.  % TODO: link to section
+  \item If it has not been done in awhile, measure and record an Empower power curve.  % TODO: link
+    % to section
+  \item Place the 407A after the telescope between the large square mirrors on the empty mount.
+    \begin{ditemize}
+      \item This mount is dedicated for this purpose, and should be left in the Spitfire at all
+        times.
+    \end{ditemize}
+  \item Set Empower current such that the Empower is delivering $\sim$20 W to the crystal (refer to
+    Empower power curve).
+\end{denumerate}
 
+\subsubsection{Cavity and pump}
+
+The first goal in alignment will be to ensure that the cavity and pump are healthy without
+seeding (in ns-lasing mode).  %
+A well-aligned Spitfire will deliver 5 to 5.2 W to the 407A when pumped with 20 W.  %
+The idea of this procedure is to be minimally invasive, while demanding good performance from the
+laser.  %
+Do not move on to seeded operation until ns-lasing is healthy, but at the same time do not do more
+then you need to.  %
+
+\begin{denumerate}
+  \item Switch to ns lasing mode.
+    \begin{denumerate}
+      \item Block seed at output of stretcher.
+        \begin{ditemize}
+          \item Note that seed must still enter the stretcher with good enough alignment to defeat
+            the bandwidth detector.
+        \end{ditemize}
+      \item Activate Pockels Cells 2 and 3---do not use Pockels Cell 1.
+      \item Expect 20 to 30 ns (2 to 3 round trips) additional build-up time in ns operation.
+        \begin{ditemize}
+          \item Means you must change timing of Pockels Cell 3 when working in ns lasing mode.
+          \item Operate the laser at its ideal switch out time when aligning ns lasing.
+          \item Refer to the records to see if your switch-out time is unusual for recent
+            performance.
+        \end{ditemize}
+    \end{denumerate}
+  \item Clean all green optics in order of light hitting them.
+    \begin{ditemize}
+      \item You must get new spectrophotometric grade methanol for this cleaning.
+    \end{ditemize}
+  \item Loop through the following until ns lasing delivers more than 5 W to the 407A.
+    \begin{denumerate}
+      \item Check to ensure no optics are damaged, have dust on them etc.
+      \item Clean optics. Check power after each cleaning---at the very least you don't want to
+        lose power. When cleaning, wait at least a second before letting the light hit the optic
+        after cleaning.
+      \item Align pump.
+        \begin{denumerate}
+          \item Decrease the pump power to $\sim$17 A. This should decrease the ns lasing output to
+            around 2 Watts, so you should can increase the sensitivity on the 407A if you wish.
+          \item Find the ideal switch out (channel 3) time for this lower pump power. It will be
+            still later than the aforementioned ns lasing switch out time. Back off the ideal ns
+            switch out time by $sim$2 round trips for optimization.
+          \item Typically the two mirrors on either side of the cavity (immediate to the lenses)
+            are the only pump mirrors touched during alignment. The first pump mirror may be
+            touched in special cases but not for regular touch-up.
+          \item Block the back reflection with the mirror mount when aligning the second pump
+            mirror.  % TODO: figure
+          \item Align the back reflection mirror (without beam block).
+            \item Iterate through the mirrors until you are satisfied that pump poynting is ideal.
+        \end{denumerate}
+      \item Align cavity.
+        \begin{ditemize}
+          \item Never touch anything except the two outermost end mirrors.
+          \item Note that the alignment tool is poor to the cavity mode intentionally.
+        \end{ditemize}
+    \end{denumerate}
+\end{denumerate}
+
+\subsubsection{Seed}
+
+Now that the cavity is good, you mus couple the seed into it.  %
+If you have just aligned the oscillator you should wait at least 10 hours before attempting to
+align the seed.  %
+
+Expect 100 to 150 mW less in seeded mode.  %
+
+\begin{denumerate}
+  \item Remove stretcher cavity flange, being careful not to damage wires.
+  \item Align the two apertures either side of the Faraday isolator using mirrors external to
+    spitfire.
+  \item Align to two ``A'' mask positions in stretcher.
+  \item Align to three ``F'' mask positions on the way to cavity (this mirror system is
+    under-constrained; consider using the final mirror of the ``A'' mask alignment as a tweaking
+    mirror).
+  \item Let seed into cavity by turning on channel 1.
+  \item Optimize (mirror at D18 and periscope) to putput power before compressor---often useful to
+    go one or two round trips less ($\sim$210 ns on channel 3) when aligning seed to power (output
+    depends on seed more sensitively and you want to optimize for largest buildup reduction
+    time).
+  \item Can adjust quarter waveplate to minimize post-pulsing if necessary but be very careful to
+    not send the output back into the stretcher.
+  \item Ensure pulse is let out of the cavity at the optimal time (check oscilloscope and power).
+  \item Remove 407A.
+  \item Reconstruct flanges on stretcher cavity.
+\end{denumerate}
+
+\subsubsection{Output}
+
+Now you must ensure that the cavity output is properly routed through the telescope and compressor
+before leaving the Spitfire.  %
+
+Note that only $\sim$80\% of the cavity output power transmits through the compressor due to
+absorbance in the grating and other losses.  %
+
+\begin{denumerate}
+  \item Align to compressor positions (two ``H'') using backwards alignment tool. You will need to
+    unplug the compressor stage cable---remember to plug back in.
+  \item If the cavity or pump was touched, consider aligning the compressor.
+\end{denumerate}
+
+\subsubsection{Cleanup}
+
+\begin{denumerate}
+  \item Make sure you have taken all of your tools out of the laser.
+  \item Make sure you remembered to plug the compressor stage back in.
+  \item Wait at least 2 hours before moving on to downstream alignment---best to wait overnight if
+    you can. It's OK to make a first pass at rough alignment, but compression and pointing will
+    probably change slightly as the laser equilibrates.
+\end{denumerate}
+
+It's normal for the Spitfire output power change by 50 to 100 mW in the first days after
+alignment.  %
+After that initial change the Spitfire tends to be stable for weeks.  %
+During experiments it's a good idea to measure Spitfire output on a daily basis.  %
+
+\subsection{Stretcher alignment}  % ---------------------------------------------------------------
+
+This is our current best strategy for stretcher alignment.  %
+Use caution and keep your brain in gear when working on this.  %
+Since we have not messed with the stretcher frequently this guide cannot be trusted blindly.  %
+
+\subsubsection{Preparation}
+
+\begin{denumerate}
+  \item Ensure that the Spitfire is off (no pump present in cavity, Pockels cells powered down).
+  \item Force upstream oscillator to go CW, adjust output color to be at center of mode-locked
+    bandwidth.
+  \item Use external mirrors to align through Faraday isolator.
+  \item Use first two mirrors after isolator to alignment tool prior to stretcher grating.
+\end{denumerate}
+  
+\subsubsection{Adjustment}
+
+\begin{denumerate}
+  \item Adjust the stretcher grating until the four dots are overlapped.
+  \item Use pickoff mirror after stretcher to get the beam to alignment tool.
+\end{denumerate}
+ 
+\subsection{Compressor alignment}  % --------------------------------------------------------------
+
+\begin{denumerate}
+  \item Use the first telescope mirror to align to the alignment tool before the first square
+    mirror preceding the compressor.
+  \item Use the second telescope mirror to align to the alignment tool when place between the
+    square mirrors preceding the compressor.
+\end{denumerate}
+  
 \clearpage
-\section{Six Month Maintenance}
+\section{TOPAS-C}  % ==============================================================================
+
+% TODO: figure
+
+\subsection{Common alignment}  % ------------------------------------------------------------------
+
+This section discusses common alignment operations that will probably need adjustment on a monthly
+basis to ensure ideal OPA behavior.  %
+All fs table users should feel comfortable performing these tuneups.
+
+Tips and tricks:
+\begin{ditemize}
+  \item As a rule of thumb, if you don't need light through the poweramp the light should be
+    blocked to avoid hot spots and damage. The light should be blocked before M8.
+  \item Use a fluorescent card to visually get a better idea of the centering of the 800 nm beam
+    through the apertures.
+  \item Align OPA1 before OPA2. For the sake of consistency, we have agreed that compression should
+    be adjusted for OPA1 best performance. OPA2 will have to ``live with'' the compression that is
+    best suited for OPA1.
+\end{ditemize}
+
+\subsubsection{Preparation}
+
+\begin{denumerate}
+  \item Ensure that the Spitfire is working (between 3.8 and 4.0 W).
+  \item Ensure that the pump is not clipping on any mirrors between Spitfire and OPAs.
+  \item Inspect mode structure of pump for hot spots or diffraction. Clean any dust off of mirrors
+    between Spitfire and OPAs.
+  \item Open OPA lid.
+  \item Set OPA to 1300 nm, ensure motors are homed.
+\end{denumerate}
+
+\subsubsection{Preamp}
+
+\begin{denumerate}
+  \item Block pump into poweramp upstream of M8 using block of metal.
+  \item Open OPA shutter.
+  \item Ensure that the WL plate is not drilled---look for ``sparking''. This takes an experienced
+    eye---ask if you have a hard time deciding. If drilled, rotate the WL plate.
+  \item Ensure that input poynting and compression are good for the preamp by iterating through the
+    following adjustments. Stop iteration once all metrics are good without further adjustment.
+    \begin{denumerate}
+      \item Iteratively align through A0 and A2. The orange-colored white light should go through
+        A2.
+      \item Ensure that your poynting changes have not introduced clipping on external mirrors.
+      \item Ensure that white light is good.
+        \begin{ditemize}
+          \item If you are aligning OPA1, adjust compression such that WLG is maximized. Do not
+            adjust compression to OPA2 WL.
+          \item Adjust $A_{WL}$ until WL is symmetric and stable.  % TODO: figure
+          \end{ditemize}
+      \item Ensure that no OPG is present in C1.
+      \item Manually adjust D1 to maximize seed intensity.  
+    \end{denumerate}
+  \item Align seed down entire row of holes in-which L6, L7, DM2, NC2, and DM3 lie. Alignment is
+    accomplished using M5 and M6.
+    \begin{ditemize}
+      \item Consider blocking pump into C1 (passing only WL) to ``toggle'' the seed---this helps
+        distinguish between orange WL and slightly redder seed.
+    \end{ditemize}
+\end{denumerate}
+
+\subsubsection{Poweramp}
+
+\begin{denumerate}
+  \item Unblock pump into poweramp.
+  \item Setup 407A power meter outside of OPA.
+  \item Adjust manual D2 until over 600 mW is achieved.
+  \item Put ``Caution fs OPA free to coldwave'' sign on laser-lab doors.
+  \item Remove all optics downstream of Mixer 3: filter periscopes (wavelength selectors),
+    periscope, beam splitter, and beam dump.
+  \item Iterate the following until optimal power and collinearity are simultaneously reached:
+    \begin{denumerate}
+      \item Adjust collinearity of three beams using DM2
+        \begin{ditemize}
+          \item All beams should be overlapped far away.
+          \item Use surveyor's telescope to observe beams.
+        \end{ditemize}
+      \item Maximize 407A-measured power using manual D2.
+      \item Maximize 407A-measured power using M10.
+    \end{denumerate}
+  \item Reassemble optics downstream of Mixer 3.
+  \item Close OPA lid.
+  \item Allow a minute for equilibration.
+  \item Measure and record power---should be over 600 mW.
+\end{denumerate}
+
+\subsection{Full alignment}  % --------------------------------------------------------------------
+
+The following discussion endeavors to be as complete as possible.  %
+The goal is to have a procedure the produces a well-aligned OPA regardless of initial
+conditions.  %
+Experienced OPA users may find only pieces of this guide necessary to solve their particular
+problem.  %
+
+\subsubsection{Preparation}
+
+\begin{denumerate}
+  \item Ensure that the spitfire is working well (between 3.8 and 4.0 W).
+  \item Ensure that the pump is not clipping on any mirrors between Spitfire and OPA.
+  \item Inspect mode structure of pump for hot spots or diffraction. Clean any dust off of mirrors
+    between Spitfire and OPAs.
+  \item Open OPA lid.
+  \item Set OPA to 1300 nm, ensure motors are homed.
+  \item Block pump into poweramp upstream of M8 using block of metal.
+  \item Block seed between compensating crystal and M5.
+  \item Remove all side walls from OPA.
+\end{denumerate}
+  
+\subsubsection{Input poynting}
+
+Input poynting is adjusted to ensure good alignment through L1 and L2 into D1.
+
+\begin{denumerate}
+  \item Remove A1/L3, VF, $A_{WL}$.
+  \item Place D2 at nominal position (45 degrees).
+  \item Using external mirrors, ensure that beam propagates through the alignment tool at the holes
+    just after L2 and just before M1 (in D1).
+  \item Ensure that you have not introduced clipping external to the OPA.
+  \item Ensure that the L1/L2 telescope is outputting a collimated, undistorted beam.
+\end{denumerate}
+ 
+\subsubsection{D1 alignment}
+
+\begin{denumerate}
+  \item If you haven't already, remove A1/L3, VF.
+  \item Ensure that you are blocking light between compensating crystal and M5.
+  \item Remove WLG plate, L4, TD, DM1, knife edge.
+  \item Set C1 to surface normal (should be 0 degrees if affix is set correctly in software.)
+  \item Using M1 and M2, ensure that beam propagates through the alignment tool at the holes just
+    after M2 and just before M5.
+\end{denumerate}
+ 
+\subsubsection{White light}
+
+\begin{denumerate}
+  \item Block preamp pump after M3 during this procedure.
+  \item Remove WL plate if it is present.
+  \item Replace/adjust AL/L3, adjusting focus to be at white light plate desired position.
+  \item Replace VF and $A_{WL}$ if they are absent.
+  \item Replace the WL plate---ensure that the plate is normal to input beam by visual inspection.
+  \item Optimize WLG using VF, $A_{WL}$, and plate position.   
+    \begin{denumerate}
+      \item Begin with $A_{WL}$ closed.
+      \item Open $A_{WL}$ 10\%.
+      \item Adjust VF to just allow for onset of WLG.
+      \item Adjust position of sapphire plate to maximize visible component of continuum.
+      \item Adjust VF to attenuate WLG pump to lowest WLG threshold where central mode and first
+        outer rings are visible.
+      \item Adjust compression for WLG symmetry.
+      \item Continue to open $A_{WL}$ and adjust VS until $A_{WL}$ is as open as possible and VF is
+        as dark as possible (while maintaining stable WLG).
+    \end{denumerate}
+  \item Replace / adjust L4.
+    \begin{denumerate}
+      \item Remove DM1 if it is present.
+      \item Adjust L4 so that the visible component of the WL continuum is focused on A2. This will
+        ensure that the NIR component focuses at NC1.
+      \item Ensure that the WL remains centered on the alignment tool / A2.
+        \begin{ditemize}
+          \item L4 may be rotated to adjust height.
+        \end{ditemize}
+      \item Replace DM1. 
+    \end{denumerate} 
+\end{denumerate}
+ 
+\subsubsection{Preamp pump}
+
+\begin{denumerate}
+  \item Remove L5, M4.
+  \item Adjust M3 to alignment tool holes near edge of OPA to M5 mount. Note that M3 may be rotated
+    to change height.
+  \item Ensure that beam is passing through alignment tool near M3. If not, consider translating M3
+    or moving BS2. Before making these adjustments ensure that the beam is true into BS2 (see input
+    poynting section above).
+  \item Replace L5. Ensure that beam through L5 is on-axis with alignment tool in far field.
+  \item Replace M4. Point pump so that it intersects with the first red ring in the WL at DM1.
+  \item Adjust DM1 to spatially overlap pump with WL in NC1.
+  \item Adjust L5 so pump focus in in C1. If OPG in C1 is seen, back-off L5 by moving towards M3
+    until OPG disappears.
+\end{denumerate}
+ 
+\subsubsection{Seed}
+
+\begin{denumerate}
+  \item Ensure that both WL and pump are entering C1 properly.
+  \item Remove M5 if present.
+  \item Manually adjust D1 to optimize seed generation.
+  \item Make fine adjustments to M4 and DM1 to ensure that the seed travels along alignment tools
+    all the way to the OPA wall. If large adjustments need to be made something upstream must be
+    wrong.
+  \item Replace M5.
+  \item Replace knife edge, if absent.
+    \begin{ditemize}
+      \item Ensure you are not clipping the red seed profile.
+    \end{ditemize}
+  \item Remove L6 and L7 if present.
+  \item Use M5 and M6 to align the seed to the alignment guide through C2 and out of the OPA.
+  \item Replace L6 and L7.
+\end{denumerate}
+ 
+\subsubsection{Poweramp}
+
+\begin{denumerate}
+  \item Ensure that pump is not clipping on BS1, M7.
+  \item Center pump on M8 using M7.
+  \item Remove L8 if present.
+  \item Using M8, M9, alignment tool ensure that pump travels along holes from M9 to M10.
+  \item Replace L8.
+    \begin{ditemize}
+      \item Back of L8 Mount to front of M10 should be $\sim$15 cm.
+    \end{ditemize}
+  \item Without clipping, place M11 and point M10 to minimize off-axis angle at M10 (this requires
+    us to put the pump 1/4 inch right of center as viewed while facing M11).
+  \item Center pump on M12 using M11.
+  \item Center pump on DM2 using M12.
+  \item Overlap with seed in NC2 using DM2.
+  \item Make small adjustments to M10, DM2 to perfect collinearity and overlap.
+  \item Adjust manual D2 until over 600 mW is achived.
+  \item Put ``Caution fs OPA free to coldwave'' sign on laser-lab doors.
+  \item Remove all optics downstream of Mixer 3: filter periscopes (wavelength selectors),
+    periscope, beam splitter, and beam dump.
+  \item Iterate the following until optimal power and collinearity are simultaneously reached:
+    \begin{denumerate}
+      \item Adjust collinearity of three beams using DM2
+        \begin{ditemize}
+          \item All beams should be overlapped far away.
+          \item Use surveyor's telescope to observe beams.
+        \end{ditemize}
+      \item Maximize 407A-measured power using manual D2.
+      \item Maximize 407A-measured power using M10.
+    \end{denumerate}
+  \item Reassemble optics downstream of Mixer 3.
+  \item Close OPA lid.
+  \item Allow a minute for equilibration.
+  \item Measure and record power---should be over 600 mW.
+\end{denumerate}
 
 \clearpage
-\section{Tuning MicroHR Monochromator}
+\section{MicroHR Monochromator}  % ================================================================
 
 Visible Grating.  %
 
-- 
cgit v1.2.3

