It is well-known that vapor phase axial deposition (VAD), unlike all other alternative layering processes such as MCVD and OVD, generates the entire radial refractive-index profile simultaneously on the end-on deposition surface of the growing soot form.1,2 Although the details of the deposition physics are relatively complex, encompassing chemical reaction and multiphase/species fluid dynamics phenomena, former investigators have empirically ascribed the deposition surface temperature distribution as the major factor governing the process.3

© 1986 Optical Society of America

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