[Retracted] Nanoscale Characterization and Impurities of Fused Silica Optical Surfaces

Table 1

Impurity content of three samples of fused silica optical surfaces.

Type	Content (μg/g)
	Sample 1	Sample 2	Sample 3
Al	13.9	14.2	14.5
Ce	1.3	1.4	1.2
Fe	1.3	1.2	1.1
Cu	0.6	0.5	0.7