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基于胆甾相液晶螺距及折射率随温度与电场变化的特性, 研究了温度与电场对液晶染料可调谐激光器发射特性的影响. 首先探讨了手性剂浓度、温度与液晶螺距的关系, 制作了液晶染料可调谐激光器, 在温度23–35℃变化时, 其发射波长调谐范围为618.90–594.76 nm, 达到24.14 nm, 在电压0–9 V 变化时, 其发射波长调谐范围为617.40–608.11 nm, 共9.29 nm.
关键词:
可调谐激光器
胆甾相液晶
激光染料 相似文献
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Effect of Molecular Weight on Liquid Crystal Photoalignment by Photosensitive Polyester Containing Thrifluoromethyl Moieties 下载免费PDF全文
We investigate the liquid-crystal (LC) alignment direction on photoalignment films formed from photosensitive polyester containing thrifluoromethyl moieties (PPDA) with various molecular weights by crossed polarized optical microscopy. It is found that LC alignment behaviour changes with molecular weight of PPDA. The LC alignment on PPDA irradiated films with the highest molecular weight is homogeneous, while those with low and intermediate molecular weights are homeotropic. However, surface morphologies show weak dependence on molecular weight. The surfaces are smooth and there is no clear morphological anisotropy on these aligned films observed by an atomic force microscope. The surface energies of the irradiated films are also measured by using an indirect contact-angle method where both surface energy and its polar component, increase with increasing molecular weight. Different polar surface energies can be considered as a main reason for different alignment characteristics. 相似文献
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学生自主选择教师上课的教学管理制度的宗旨是在教学中引入竞争机制, 使优胜劣汰的竞争机制在课
堂教学中发挥作用, 从而提升教师对本科教学的重视程度, 提升教师教学能力, 增加教师之间的沟通、 交流以及促进
教师对课程内容的深入研究. 在这种制度下, 学生可自主选择适合自己风格的教师听课, 即学生能主动参与到教学
活动中, 充分体现了“ 以学生为中心”的教学理念, 并调动了学生自主学习的积极性. 介绍了哈尔滨工业大学在大学
物理课程中实施学生自主选择教师上课制度的教学实践过程及获得的教学效果 相似文献
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