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Real time phase modulation measurements in liquid crystals

Bennis N., Merta I., Kalbarczyk A., Maciejewski M., Marc P., Spadlo A., Jaroszewicz L. R.

Opto-Electronics Review

2017

Vol. 25, No. 2

69--73

We propose real time phase measurements in liquid crystals cells using Young’s interferometer constructed with a new principle with possibility to control the distance between two point sources. The optical interference optical pattern is detected by a bicell photo-detector in a back Fourier focal plane. A phase modulation controlled by a mono pixel liquid crystals’ cell placed in a reference arm of interferometer is observed as a dynamic shift of the fringes’ pattern in spatial domain. Concept of signals’ demodulation in the Fourier focal plane will be described using a new approach to the demodulation signals. In this work we evaluate the demodulation condition of our setup and we present measurements of a dynamic phase response for nematic liquid crystals and antiferroelectric liquid crystals cells.