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User name X. Zheng
Log entry time 14:44:03 on June19,2001
Entry number 63788
keyword=Rotate half waveplates back
Target polarization dropped from 34% to 25% four hours after the field was rotated from 0 to 180 degrees. So during the controlled access at 11am, Wolfgang, XiaoFeng and I went to laser hut and rotate half waveplates back to the original direction. One explaination to the adjustment we did yesterday is that the laser absorption does not depend on the laser polarization only, it is possible that when the laser is not circularly polarized, part of the laser power depolarizes rubidium and the rest of laser pump it back. So the total absorption is higher but in fact the laser polarization is worse.