40m QIL Cryo_Lab CTN SUS_Lab TCS_Lab OMC_Lab CRIME_Lab FEA ENG_Labs OptContFac Mariner WBEEShop
  PSL  Not logged in ELOG logo
Entry  Wed Jun 30 11:34:37 2010, Frank, HowTo, PMC, PMC fixed 
    Reply  Wed Jun 30 12:31:22 2010, tarac, HowTo, PMC, PMC fixed 
       Reply  Wed Jun 30 12:39:17 2010, Frank, HowTo, PMC, PMC fixed 
Message ID: 191     Entry time: Wed Jun 30 12:31:22 2010     In reply to: 190     Reply to this: 192
Author: tarac 
Type: HowTo 
Category: PMC 
Subject: PMC fixed 

Quote:

the reason why you had this flickering problem was that you had too much power on the RFPD in reflection of the PMC. You already saturated it.
I also reduced the RF power as the error signals were not signals anymore, just spikes.

my new settings are:

RF power : 3.0
Phase : 2.5
PMC Gain: 14dB

reduced laser power to 40mW. Transmitted power is 32mW .You have to exchange the output coupler mirror in front of the RFPD in order to increase the power. I think 32mW is enough, it's something like 13mW per cavity.

 

 

 Ok, I'll find another output coupler mirror and replace the current one, and make sure that it will not saturate the RFPD.

ELOG V3.1.3-