. <> = 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) === [[attachment:GnH.pdf]] {{attachment:GnH.png}} === CVI Y1S-0 === Note: The beam used to test this was primarily S-polarized with a 0.6% P-mode impurity {{attachment:Y1S0-1064.png}} {{attachment:Y1S0-532.png}} === CVI Y1S-45 === Note: The beam used to test this was primarily S-polarized with a 0.6% P-mode impurity {{attachment:Y1S45-1064.png}} {{attachment:Y1S45-532.png}} === CVI Y1-45S === {{attachment:Y45S-1064.png}} {{attachment:Y45S-532.png}} === CVI Y1-45P === {{attachment:Y45P-1064.png}} {{attachment:Y45P-532.png}} === CVI Y1-0 === {{attachment:Y150CC-1064.png}} {{attachment:Y150CC-532.png}} The data for all the Y1 measurements can be found in: [[attachment: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 ...