Slides by Takashi Yamanaka
Participants: Tauchi, Terunuma, Kuroda, Okugi, Yamanaka, Kamiya(WebEx)
Topic: Phase Stability Measurement using Phase Monitor
* Phase measurement has done by using the CW laser to remove the
effect of laser angular jitter.
* Phase monitor ch2 seems to have less phase search resolution.
* As a result, phase jitter pulse by pulse disappeard but the seconds
order vibration remained althogh the phase stability in 1 min is
improve to 170 mrad.
* Phase drift in long time has no correlation to the air temperature.
* If I hammer the optical table lightly, phase jump was observed.
And also the vibration source was put near the optical table on purpose,
the phase stability was degenerated to 260 mrad in this case.
* From the frequency analysis phases of two monitors has a clear inverse
correlation below 0.01 Hz and above this frequency the correlation getting
worse.
Suggestion: To clear the cause of phase drift, longer measurement (longer
than 1 day) is needed.
Suggestion: To make the measurement reliable, you need to do performance
test of phase monitor.