In summary, the health of the laser is okay.



The first plot is of the output power of the frontend laser pump diodes, D1, D2, D3, and D4.  The output power decline for D1 and D2
is fairly small, declining about 2.5% over the last 6 months.  For diodes D3 and D4 the picture is less clear as the signal is a little
noisier, but it looks like about 5% over the last 6 months.

The second plot is of the diode currents.  DCUR1 corresponds to the currents for D1 and D2.  DCUR2 for D3 and D4.  Considering that
none of us have explicitly changed the diode current this should appear constant (and it does).

The third plot is of the output power of the various stages in the power amplifier.  The fluctuations in the power monitors for stages
1 through 3 might be due to relative humidity fluctuations in the LAE.  The output of the frontend laser decreased by ~2 W about 120
days ago.  This might be a real power decrease or the alignment of the beam onto the monitoring photodiode.

The NPRO output power has steadily declined.  Attached are 3 plots of the NPRO output power.  6 months, 2 years and going back to
May 2012.  To recover some out the output power, we should consider increasing the diode current.


/* Note the frontend diode box was switched out on June 6th, 2014. */