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In this paper, we report the improved lasing threshold in cholesteric liquid crystal (ChLC) lasers using an in-plane helix alignment, where the helix axis lies in the in-plane direction of the cell. The in-plane helix alignment of ChLCs was obtained by applying an in-plane electric field in a cell with homeotropic surface treatment while cooling the sample from the isotropic phase. The energy threshold of this device was 0.3 mJ/(cm 2 ·pulse), which was found to be less than 1/35 that of conventional planarly aligned ChLC lasers.
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Inoue et al. (2010) studied this question.
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