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  Sun Nov 8 14:35:25 2009, Frank, Laser, RefCav, resonance frequencies 
    Reply  Mon Nov 9 02:19:45 2009, rana, Laser, RefCav, resonance frequencies 
       Reply  Mon Nov 9 18:49:15 2009, Frank, Laser, RefCav, resonance frequencies 
Message ID: 2     Entry time: Sun Nov 8 14:35:25 2009     Reply to this: 4
Author: Frank 
Type: Laser 
Category: RefCav 
Subject: resonance frequencies 

i checked the resonant frequency of both cavities in order to see if we can lock both using the existing frequency actuator (AOM) for the first one. Used the slow frequency actuator of the NPRO (temp) to scan the frequency.

refcav1 is resonant @ 0.7578V

refcav2 is resonant @ 0.5068V

assuming about 1GHz/V the resonances are about 250MHz different. So we have to use the thermal actuator on one of the cavities in order to tune it. I started a calibration scan for the heater on friday in order to set the correct heating power as the time constant is more than an hour and trial and error method would take too long...

ELOG V3.1.3-