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利用光学相位延迟法 ,观察到平行排列丝状液晶在超短脉冲激光 (10ns)激励下的瞬态扭曲形变 .实验结果表明 ,虽然脉冲激光的电场强度远远大于液晶发生扭曲形变的阈值 ,但并不能保证液晶会发生瞬态扭曲形变 .这主要是因为脉冲激光的激励时间非常短 ,而液晶分子发生扭曲形变的响应时间相对较长 ,从而使其来不及形变 .分析发现 :激励激光的偏振方向与平行排列丝状液晶分子的最佳夹角是 4 5°.利用此条件 ,观察到掺微量D型苏氨酸卟啉的平行排列丝状液晶在超短脉冲激光激励后具有记忆效应 ,这在光存储和记忆显示方面有很大的实用价值 .
The optical phase retardation method was used to observe the transient torsional deformation of parallel-arranged filamentous liquid crystals excited by ultra-short pulse laser (10ns). The experimental results show that although the electric field intensity of pulsed laser is far greater than the threshold value of torsional deformation of liquid crystal, And can not guarantee the liquid crystal transient distortion occurs.This is mainly because the pulse laser excitation time is very short, and liquid crystal molecules distort the deformation response time is relatively long, which makes it too late to deformation analysis found that: the excitation laser polarization direction And parallel arrangement of the filamentous liquid crystal molecules is the best angle of 45 ° .Under this condition, it is observed that the D-type threonine porphyrin doped parallel arrangement of filamentous liquid crystal has a memory effect after ultrashort pulse laser excitation, which In the optical storage and memory display has great practical value.