NEXT
Make New Entry,
Make Followup Entry
User name Jin
Log entry time 15:59:38 on December 02, 2008
Entry number 251759
This entry is a followup to: 251716
keyword=Target Laser 1/4 plate calibration with absorption spectrum
Target pumping Laser 1/4 plates are calibrated to maximize absorption
peak @ 795.1nm ( = minimize absorption)
The initial state is
* Holding Field = Transvers -
* Spin = -
* 3 x Comet Laser
* He3 Position, no beam
The initial 1/4 plate angle is
Motor # 0338 = 9 Degree
Motor # 1474 = -81.2 Degree
Absorption Peak = 10250 (arbitary unit)
optimized 1/4 plate angle is
Motor # 0338 = 3 Degree
Motor # 1474 = -84 Degree
Absorption Peak = 10750 (arbitary unit)
Finialized 1/4 plate angle is
Motor # 0338 = 6.5 Degree
Motor # 1474 = -83.5 Degree
Absorption Peak = 10600 (arbitary unit)
optimized 1/4 plate angle is not used because it's outside range of
limit switch (6 to 10 Degree or -84 to -80 Degree).
If the equlibrium polarization during following production is not
higher than before, we can always fall back to original 1/4plate
settings at any time.
A copy of this log entry has been emailed to: yqiang, jpchen