Patent ID: 7854147

Claim:
A method for producing a semifinished product for an optical component of synthetic quartz glass of high homogeneity, the method comprising: (a) feeding a silicon-containing start compound, which can be converted by oxidation or hydrolysis into SiO 2 , to a deposition burner, and forming amorphous SiO 2 particles in a burner flame associated with the deposition burner; (b) forming a substantially solid-cylinder SiO 2 blank by depositing the SiO 2 particles onto a support with a longitudinal axis in successive layers, most of said layers extending in parallel with the longitudinal axis of the support and extending toward and ending at an outer cylindrical surface of the blank; and (c) homogenizing the SiO 2 blank, including twisting along an axis of rotation extending coaxially to or in parallel with the longitudinal axis while forming the semifinished product.