I like to ask someone to review the calculation on the wiki.
In the calculation, the round trip loss and the front mirror T are the unknown variables.
The end mirror T of 10ppm was assumed. (End mirror T)+(Round trip loss) is almost invariant, and T_end does not change the other results much.
Arm cavity loss measurement (Dec. 14, 2009)
X Arm:
- Arm visibility (given): 0.897 +/- 0.005 (20 pts) (2.5%UP!!)
- Cut off freq (given): 1616 +/- 14 [Hz] (2.1%UP!!)
- Finesse (derived): 1206 +/- 10 (2.1%UP!!)
- Round Trip loss (estimated): 127 +/- 6 [ppm] (28%DOWN!!)
- Front Mirror T (estimated): 0.00506 +/- 0.00004
Y Arm:
- Arm visibility (given): 0.893 +/- 0.004 (20 pts) (2.1%UP!!)
- Cut off freq (given): 1590 +/- 4 [Hz] (8.2%UP!!)
- Finesse (derived): 1220 +/- 3 (8.2%UP!!)
- Round Trip loss (estimated): 131 +/- 6 [ppm] (37%DOWN!!)
- Front Mirror T (estimated): 0.00500 +/- 0.00001
Previous measurement (Oct 07, 2009 & Nov 10, 2009)
X Arm:
- Arm visibility (given): 0.875 +/- 0.005 (34 pts)
- Cut off freq (given): 1650 +/- 70 [Hz]
- Finesse (derived): 1181 +/- 50
- Round Trip loss (estimated): 162 +/- 10 [ppm]
- Front Mirror T (estimated): 0.0051 +/- 0.0002
Y Arm:
- Arm visibility (given): 0.869 +/- 0.006 (26 pts)
- Cut off freq (given): 1720 +/- 70 [Hz]
- Finesse (derived): 1128 +/- 46
- Round Trip loss (estimated): 179 +/- 12 [ppm]
- Front Mirror T (estimated): 0.0054 +/- 0.0002
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