20 February 2017 Phase and group delay control of femtosecond pulses with liquid crystal cells and application to hyperspectral imaging
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Abstract
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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Aurélie Jullien, Aurélie Jullien, Umberto Bortolozzo, Umberto Bortolozzo, Stefania Residori, Stefania Residori, Stéphanie Grabielle, Stéphanie Grabielle, Nicolas Forget, Nicolas Forget, Jean-Pierre Huignard, Jean-Pierre Huignard, } "Phase and group delay control of femtosecond pulses with liquid crystal cells and application to hyperspectral imaging", Proc. SPIE 10119, Slow Light, Fast Light, and Opto-Atomic Precision Metrology X, 101191B (20 February 2017); doi: 10.1117/12.2261211; https://doi.org/10.1117/12.2261211
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