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Electro-tunable liquid crystal waveguide laser

机译：电可调谐液晶波导激光器

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摘要

Electrically tunable laser action has been demonstrated in a dye-doped nematic liquid crystal (NLC) waveguide by holographic excitation. The optical feedback were provided by a transient grating induced by two-beam interference using Lloyd mirror configuration, and the distributed feedback (DFB) laser action was observed. Electrical tuning of lasing wavelength was realized due to the change of the effective refractive index of the NLC core layer caused by the reorientation of NLC molecules. The total shift of lasing wavelength was about 30 nm, which could be realized with less than about 1.4 V of applied voltage. Based on a waveguiding mode theory, numerical analysis of TM-guided mode in the presence of applied electric field was performed, and field-induced tuning of the lasing wavelength was investigated in detail. Prospects for the realization of a single-mode operation and tuning of the lasing wavelength was also shown. Based on the numerical results, single-mode operation of lasing was experimentally realized utilizing NLC with low refractive indices.
机译：通过全息激发，已在染料掺杂的向列液晶（NLC）波导中证明了电可调激光作用。通过使用劳埃德镜配置由两光束干涉引起的瞬态光栅提供光反馈，并观察到分布式反馈（DFB）激光作用。由于NLC分子的重新取向导致NLC核心层的有效折射率发生变化，因此实现了激光发射波长的电调谐。激射波长的总偏移约为30 nm，这可以通过施加小于约1.4 V的电压来实现。基于波模理论，对存在外加电场的TM导模进行了数值分析，并详细研究了激射波长的场致调谐。还显示了实现单模操作和调整激光波长的前景。基于数值结果，利用低折射率的NLC通过实验实现了激光的单模操作。

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