Attached is a plot of the diffracted power versus offset slider position.
With the current slider setting of 6.35, we are diffracting around 3 W of
light.  Even if the output power of the laser was only 100 W, this would
be 3% not the indicated ~15%.  However we know the output power of the laser
is greater than 100 W, so obviously the percent diffracted light is even less
than 3%.

   This is noticeably less than when the ISS was last tuned up.  Back then a
slider setting of 6.35 would diffract about 7 W.  Although nothing has changed
hardware-wise, it is possible that the 80 MHz source for the ISS AOM is no
longer providing the ~32 dBm, or the AOM driver is deteriorating.




Jason/Peter