M1 and M2 reflectivity measurements using IRISM1 and M2 reflectivity 2023The M1 and M2 were re-aluminised June 8th 2023 at WHT. The Aluminising Report states:
M1 and M2 reflectivity 2018The M1 was washed on May 2015 and again November 2016. The plot below shows the fresh aluminum literature reflectivity (black line), the 2014 reflectivity before (magenta) and after realuminisation (green) and reflectivity after wet washing, May 2015 (blue) and November 2016. The briefcase indicates test plates which are kept in a briefcase in the mechanics room. These measurements were taken with the ING reflectometer.A comment from Neil O'Mahony (the ING Optics Technician) "Your scattering is also as good as we've got in the past. So I think you can be happy with your cleaning technique, especially in the extreme bands" November 2018: "Compared with measurements 2 years ago, reflectivity is down by less than 1% in blue, improved in red by about half of one percent. Scattering losses show a similar trend from blue to red, also observed in aged coatings at ING." 
M1 and M2 reflectivity 2014The M1 and M2 were realuminised on June 2014 (previously July 2009).
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