NON-LOCK LEVEL

• Turn OFF the servo of the electronic.
• Take a look at the oscilloscope.
  
  • Check if the reflected power is plugged on channel 1.
  • At the front panel, push on "shift" button, then "setup" button.
  • Under the screen panel push the "Recall saved Setup".
  • On the right screen push "Recall Setup 2".
  • Now you must note the no-lock level of the reflected diode in mV (Vna).

LOCK LEVEL

• Turn ON the servo of the electronic, and wait the cavity is locked
• Select the "Powermeter 2" Epics window on the optic table:





• Note the stat mean value and the standart deviation value on Channel A.
  This value is the incident power of the photon beam.
• Select the "Powermeter 1" Epics window on the optic table:





• Note the stat mean value and the standart deviation value on Channel A et B.
  The value on channel A is the power on sphere S2, and channel B is the power on sphere S1, both staying after the optical cavity.
• Take a look at the oscilloscope.
  "Recall Setup 3".
  Now you must note the lock level of the reflected diode in mV (Va).

TURN OFF THE LASER

• Take a look at the oscilloscope.
  Select the "Recall Setup 1".
  It is the predifined setup for the finesse mesurement with the reflected power.
• Turn OFF the laser
• Go back to the oscilloscope and check if the decreasing power is well.
  If yes, then:
  • Insert disk in the driver
  • On the front panel push the "shift" button and the "waveform" button
  • Under the screen panel push the "save waveform ChX"
  • On the screen right push the "to file" button
  • The device choose a name tekxxxx.csv
• Then, at the front panel of the oscilloscope, push on "shift" button, then "setup" button.
  "Recall Setup 3".
  Note the noise level of the reflected diode in mV (Vobs)
• Note the stat mean value and the standart deviation value of the Channel A on powermeter 2, and values of channels A and B on powermeter 1.

Do the same thing for the LEFT photon polarization