Abstract
Thanks to their transparency in a wide range of the electromagnetic spectrum and high birefringence, liquid crystals offer a versatile platform for light manipulation. Several optical functions, as spectral filters, light shaping, delay lines and phase shifter are implemented. Controlling group delay can be directly achieved for ultrafast (femtosecond) pulses by using simple nematic liquid crystal cells, offering potential applications in coherent beam combining and ultrafast optical measurement. On the other hand, by exploiting two-wave mixing in liquid crystal light-valves, a large group delay is produced in the liquid crystal layer. The large group delay induces an enhanced phase sensitivity, which can be exploited for precision interferometry and high sensitivity Doppler shift detection.
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