Experimental IFP

I I Monomer soiution (homogeneous refractive index) I I Viscous region (gradient refractive index) 

Polymer region -2. Viscous region, reaction zone 3. Monomer solution 

The position of the gradient maximum along the y axis of the cuvette is the front postion (as indicated by the dot at 0.5 cm). 

Other important hallmarks in the history of IFP include IFP systems with dopants. Ref [15] reports the first use of deuterated and fluorinated MMA derivatives to produce GRINS of lower signal loss. Additionally, Refs. [24], [25] and [50] report the use of metal-doped plastic optical fibers (POFs) to increase attenuation. In addition. Ref [26] reports the use of a two-step IFP process to 

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