Abstract
A procedure is described that can measure optical phase retardations of birefrigent materials with a resolution 2×10−4 radians. The method relies on phase modulation with alternate right and left handed circularly polarized light. Phase sensitive detection is employed to reduce noise and thermal fluctuations in the optics and light source. The method is useful in Frederik’s transition measurements to determine the elastic constants of weakly birefringent polymer liquid crystals with long equilibration times.
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Dupré, D.B., Fernandes, J.R. (1985). The Determination of Elastic Constants in Weakly Birefringent Liquid Crystals. In: Blumstein, A. (eds) Polymeric Liquid Crystals. Polymer Science and Technology, vol 28. Springer, Boston, MA. https://doi.org/10.1007/978-1-4899-2299-1_27
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DOI: https://doi.org/10.1007/978-1-4899-2299-1_27
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