Patent ID: 9067816
Filing Date: 2015-06-30
Classification: C03B,C23C

Abstract:
1. A method of Plasma Chemical Vapor Deposition, comprising: supplying one or more glass-forming gases to a glass substrate tube; inducing, via microwave radiation at a wavelength λ, a plasma within the glass substrate tube to effect deposition of one or more glass layers onto the substrate tube's interior surface; and during the step of inducing a plasma to effect deposition of one or more glass layers, supplying plasma-reactive gas to the substrate tube in one or more pulses as a function of the plasma's axial position along the substrate tube's length to control deposition oscillation and/or refractive-index oscillation, wherein the one or more pulses correspond to longitudinal positions along the substrate tube's length equaling one half or an uneven multiple of one half of the microwave-radiation wavelength λ.