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15 February 2017 Femtoseconds-picoseconds nonlinear optics with nearly-mm thick cholesteric liquid crystals
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We have succeeded in fabricating unusually thick (up to ~ 550 microns), well aligned cholesteric liquid crystals that possess low scattering loss, large operating temperature range and well-defined photonic bandgap in the visible - near infrared regime. These CLC’s possess sufficiently large ultrafast (sub-picosecond) electronic optical nonlinearity needed for direct compression, stretching and recompression of femtoseconds-picoseconds laser pulses without additional optics, as demonstrated by theory and experiments. Despite such world-record setting thickness, these CLC’s are extremely compact in comparison to other state-of-the-art materials/devices used for similar operations. They are therefore highly promising for miniaturization and reduced complexity of photonic platform/systems for ultrafast pulse modulations.
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I. C. Khoo, Chun-Wei Chen, Tsung-Jui Ho, and Tsung-Hsien Lin "Femtoseconds-picoseconds nonlinear optics with nearly-mm thick cholesteric liquid crystals", Proc. SPIE 10125, Emerging Liquid Crystal Technologies XII, 1012507 (15 February 2017);

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