Measurement of reflectivities and transmissivity of various mirrors
Motivation
- 532nm will be used in the 40m upgrade
- Various incident angle for 1064nm
Measurement setup
Results
G&H (measured by Shannon Sankar@MIT)
CVI Y1S-0
Note: The beam used to test this was primarily S-polarized with a 0.6% P-mode impurity 
CVI Y1S-45
Note: The beam used to test this was primarily S-polarized with a 0.6% P-mode impurity 
CVI Y1-45S
CVI Y1-45P
CVI Y1-0
The data for all the Y1 measurements can be found in: Y1_data.mat
ETM
The transmissivity of the ETM at normal (±1 degree) incidence was measured to be:
1064nm: 44 ± 5 ppm
532nm: 97.7% ± 0.5%
Beamsplitter
The Reflectivity and Transmissivity of the beamsplitter were measured at 45±1 degree incident:
532 nm: T = 97% ± 1.3%
- R = 2.1% ± 0.1%
1064nm: T = 52.02% ± 0.07%
- R = 48.05% ± 0.07%
This beamsplitter should be much closer to 50/50 for 1064, so it is probably worthwhile to repeat this measurement to confirm these numbers.
Summary
- XX mirror is useful for XXX purpose.
- XX mirror is useful for XXX purpose.
- Spare of the current ETM has R and T of XXX. Compared to the specification ...
- New XXX has R and T of XXX. Compared to the specification ...