[Hugh R.  Suresh D.]


     Yesterday we swapped out the HAM3 oplev laser (Sl. 122-1 was replaced by Sl. No. 199).  However the Sl# 199 which had behaved well in the lab for four days chose to go into wild 100% power drops when placed in LVEA.  The period between drop outs increased gradually as the laser approached thermal equilibrium (see the attached pic). However this was not a stable configuration so I brought it back to the lab and found that the problem was with the laser temperature servo.  The power drop outs went away after a bit of tweaking of the servo gains and the set point (which was too high).  

      The Sl#199 has been replaced back in the HAM3 oplev and I am monitoring its performance.