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Optics Letters

Optics Letters


  • Vol. 24, Iss. 21 — Nov. 1, 1999
  • pp: 1481–1483

Polymer relaxations determined by use of a temporally and thermally stable interferometer

F. Ghebremichael and R. J. Knize  »View Author Affiliations

Optics Letters, Vol. 24, Issue 21, pp. 1481-1483 (1999)

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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

OCIS Codes
(120.3180) Instrumentation, measurement, and metrology : Interferometry
(120.4640) Instrumentation, measurement, and metrology : Optical instruments
(310.3840) Thin films : Materials and process characterization
(310.6860) Thin films : Thin films, optical properties

F. Ghebremichael and R. J. Knize, "Polymer relaxations determined by use of a temporally and thermally stable interferometer," Opt. Lett. 24, 1481-1483 (1999)

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