Diffraction pattern

Surface Roughness

LPT NOM machine

Veeco being used to measure a plano mirror

Micro-roughness is one of the key parameters affecting mirror performance through scattering. It is also important for diffraction crystals.

Surface micro roughness is measured with the Veeco (Veeco NT2000) non-contacting optical interferometer.

Mirrors are measured on a grid of points over the entire optical area (typically a minimum of 10 points). The system has a resolution of <1Å rms and can measure an area of up to 5x5 mm in one measurement.

Roughness data

Example of roughness data