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Entry  Sat May 5 20:30:21 2018, Koji, Update, PSL, Modulation depth measurement for the 3IFO aLIGO EOM and aftermath 
    Reply  Sat May 5 22:32:07 2018, Koji, Update, PSL, Modulation depth measurement for the 3IFO aLIGO EOM  
    Reply  Tue May 15 10:42:14 2018, Koji, Update, PSL, Modulation depth measurement for the 3IFO aLIGO EOM and aftermath 
Message ID: 13818     Entry time: Sat May 5 20:30:21 2018     Reply to this: 13819   13842
Author: Koji 
Type: Update 
Category: PSL 
Subject: Modulation depth measurement for the 3IFO aLIGO EOM and aftermath 

Caution: Because of this work and my negligence, the RF output of the main Marconi for the IFO modulation is probably off. The amplifier (freq gen. box) was turned on. Therefore, we need to turn the Marconi on for the IFO locking.

I worked on my EOM m easurement using the beat setup. As there was the aux injection electronics, I performed my measurement having tried not to disturb the aux setup. The aux Marconi, the splitted PD output, and an open channel of the oscilloscope were used for my purpose. I have brought the RF spectrum analyzer from the control room. I think I have restored all the electronics back as before. I have re-aligned the beat setup after the EOM removed. Note that the aux NPRO, which had been on, was turned off to save the remaining life of the laser diode.

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