Abstract

We have applied a new modified Sagnac interferometric technique to measure the real part of the intensity-dependent refractive index of a single-mode polymer optical fiber. For a 0.1% by weight squaraine dye in a poly(methyl methacrylate) core, Re[χ1111(3)] is 12(±7) × 10−13 cm3/erg at λ = 1064 nm. We discuss the effect of these measurements on all-optical devices.

© 1996 Optical Society of America

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