This webpage contains information about the measurements.

Reflectivity results - Notes on the data

• Equipment: SMS μscan reflectivitymeter

• Lambda (micron): 0.67

• Incident angle (degree): 25

• BW (Bandwidth) limits: 1 - 0.1

• RMS - Root Mean Square surface roughness in Angstrom

• BSDF - Bidirectional scatter distribution function, it is equal to the scattered power per unit solid angle normalized by the incident power and cosθ

IMPORTANT notes (Tibor):

- it turned out (December, 2006) the head could be sensitive to the temperature changes, so it is essential to bring the reflectivitymeter to the place where the measurement of the given mirror will take place and leave there at least 15 minutes before the measurement (in these places the temperature could be considered as stable)

- also because of the same reason, after CO2 cleaning of the mirrors it is necessary wait approx. 15 minutes until the mirror is cooled down, and take the measurements only after this 15 minutes; otherwise it can happen that the reflectivitymeter will show incorrect results (e.g. reflectivity above 100%)