We describe a phase-controlled, highly stable interferometer that is ideal for use in long-time and high-temperature studies. We recorded output intensity variations of <0.2% for over 6 h at temperatures up to 150°C. The setup was used to study in situ the temperature and frequency characteristics of a thin polymer film composed of 4-dimethylamino-4′-nitrostilbene doped into poly(methyl methacrylate). The mobility of the dopant molecules, which governed the electro-optic property of the film, was used to probe the dye-doped polymer’s rheology. We demonstrate one application of the interferometer in probing both the α and the β relaxations of the polymer.

© 1999 Optical Society of America

[Optical Society of America ]

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