The inertial stability of a uniquely balanced optical scanner is analyzed and reported. A scanner having two symmetric pairs of facets is balanced additionally to inertial stress, and is shown to exhibit significantly reduced dynamic deformation and scanned beam aberration. Evaluation of an aluminum scanner rotating at the high speed of 30,000 rpm reveals a developed focal spot astigmatic oblateness of less than 4%.
"Inertial stability of the dual open-mirror optical scanner", Proc. SPIE 3131, Optical Scanning Systems: Design and Applications, (7 July 1997); doi: 10.1117/12.277762; https://doi.org/10.1117/12.277762