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Recently found ferroelectric nematic (NF) liquid crystals are unique polar states with highly fluidic nature, which may realize many unconventional/unprecedented applications. Here in this study, we doped NF with an infrared laser dye so that it equips laser gain. Since NF is a non-centrosymmetric state and thus inherently activated for even-order nonlinear optics, this makes it possible to upconvert infrared photons into ultra-violet, via the simultaneous coherent processes of lasing and frequency doubling.
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