Sheila, Corey, Brina, Lance, Genevieve, Oli

After the lockloss, we went to EX to adjust the ALS X laser current and temperature.  We found the settings at 1.874A, 25.06C, we left them at 1.889A, 25.17C.  

When we first looked at the beatnote on the agilent we could see that there were multiple beatnotes, and that the power was drifting back and forth between them, supporting the idea that the laser was mode hopping. We adjusted the current up and the temperature down until most of the power seemed to be stably in one beatnote, below 100MHz.  Then Corey was able to lock the PLL, and saw a beatnote strength of 4dBm and reset the threshold to it's normal value of -10dBm.  

The attached trend shows that in the last couple of hours, the beatnote has dropped down.  This may mean that we didn't move the current enough to completely avoid mode hopping.