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Entry  Mon Dec 9 19:19:04 2019, Yehonathan, Update, PSL, AOM first order beam alignment 20191209_193112.jpg20191209_193203_HDR.jpgimageedit_2_7551928142.gifimageedit_3_5863650538.gif
    Reply  Tue Dec 10 01:24:17 2019, Yehonathan, Update, PSL, AOM first order beam alignment 
       Reply  Tue Dec 10 13:26:46 2019, Yehonathan, Update, PSL, AOM first order beam alignment 
    Reply  Fri Jan 17 21:56:22 2020, Yehonathan, Update, PSL, AOM first order beam alignment 20200117_174841.jpg
       Reply  Wed Jan 22 11:00:21 2020, gautam, Update, PSL, PMC REFL ghost beam 
Message ID: 15131     Entry time: Fri Jan 17 21:56:22 2020     In reply to: 15087     Reply to this: 15138
Author: Yehonathan 
Type: Update 
Category: PSL 
Subject: AOM first order beam alignment 

Today I noticed that the beam reflected from the PMC into the RFPD has a ghost (attachment) due to reflection from the back of the high transmission beam splitter that stirs the beam into the RFPD.

The two beams are focused into the RFPD.

In the past, the ghost beam was probably blocked by the BS mirror mount.

I put an iris to block the ghost beam.

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