Humidity dependence of the birefringence in poly(methyl methacrylate) waveguides.
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 δ(TM) - δ9(TE) were found within the range of 5-90% relative humidity (RH). From the obtained data, Δ(n(TE) - n(TM))/ΔRH as a function of humidity was calculated and plotted.
Pincenti
J C
JC
Naylor
D L
DL