We present a tunable delay line suitable for femtosecond pulse trains based on cascaded electrically-controlled nematic liquid crystal cells. Simple and collinear implementations enable to shape the achievable temporal range, with sub-femtosecond temporal accuracy, thus disclosing ultrafast applications in nematic liquid crystal-based devices. Independent control of the phase and group delay of femtosecond pulses is demonstrated. Furthermore, we successfully extend the method to Fourier-Transform hyperspectral imaging. The proposed devices are compact, low-cost, with no moving parts, scalable in size and spectral range.
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