Abstract

A humidity-dependent birefringence in a poly(methyl methacrylate) waveguide has been observed. This dependence was determined by coupling both a transverse electric and a transverse magnetic mode into a waveguide and then measuring the relative phase at the output. With this method, values for δTM − δTE were found within the range of 5–90% relative humidity (RH). From the obtained data, Δ(n TEn TM)/ΔRH as a function of humidity was calculated and plotted.

© 1994 Optical Society of America

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