149
edits
Zjs log: Difference between revisions
Jump to navigation
Jump to search
no edit summary
No edit summary |
No edit summary |
||
|
*There are wiggles at 100Hz or so on top of the transmitted peak (it's really more of a band because of the fast feedback). These wiggles cause locking performance to suffer as well. This is difficult to untangle from the other issues. It appears laser feedback/current can be adjusted to suppress these wiggles. Then the transmitted power band looks smooth and the locked output is very stable.
*As per Nick the temp bandwidth is a couple degrees so we can adjust it by a 1/2 a degree or so to modify the shape of the error signal and get better locking performance. Considering the tuning sensitivity to temp (16deg/nm), we would want to adjust the temp a bit on opposite ends of a 1nm scan for example.
*It seems our number one priority now is squashing the wiggles on the transmitted band. Although difficult to achieve, when the wiggles are gone and the laser is locked, the output is very quiet. It's not clear what is causing those wiggles. I though it was the laser piezo drifting, but shorting it did not eliminate the problem.
| |||