The 2-mirrors cavity has 460ppm of transmission for M1 and 10ppm for M2 which should exhibit a Finesse around 13400.
Today, we managed to lock the NKT laser (with an AOM for fast feedback) onto the cavity, and we made 5 Finesse measurements with the modulation technic : 14151, 13847, 13968, 14604, 13892 with an average around 14000 => LW = 216MHz/F ~ 16kHz.
On the plot (Frequency span 1MHz <=> Time span 10s)
blue curve : raw data
black curve : cleaned data
red curve : fitted data
| Alice Renaux wrote: |
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Yesterday, we changed the M1 mirror to a 161185 Gamma Factory mirror of transmission 460ppm, the cavity finesse is now 13360.
We managed to lock it today.
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The dust meter cap was cleaned using Alcohol, and using the filter white cap the dust count was (0 Av. 10 min)
After the dust counter was hand held in direct airflow, it counted (1581 p/m3 Av. 2 min).
I tested the count also in the SAS, and it counted twice the amount ~ 4500 p/m3
Note: discussion on the next steps to take for the airflow filtering !!!!!!!! |