Let me put some klog links related to mirror scattering measurement.
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16 May 2022: "Laser scattering measurement (test samples and ITMY)" link
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07 June 2022: "Camera calibration for scatter light measurement of mirror" link
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16 June 2022: "Mirror scattering estimation" link
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17 June 2022: "Clean up of the mirror scattering measurement set up": link