All-optical responsive azo-doped liquid crystal laser protection filter.
All-optical responsive azo-doped liquid crystal laser protection filter.
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DOI：
10.1364/oe.26.034179
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发表时间：
2018-12
期刊：
影响因子：
3.8
通讯作者：
Ethan I. L. Jull;H. Gleeson
中科院分区：
文献类型：
--
作者：
Ethan I. L. Jull;H. Gleeson
设计了一种全光可切换扭向列型液晶系统，该系统利用光诱导液晶序的变化作为激光保护滤波器。该滤光片采用光致变色偶氮掺杂液晶混合物，其已被光学表征并并入激光滤光片装置中。即使在低强度（0.5 mW）的连续405 nm激光照射下，传输和阻挡模式之间的切换能力也会发生。阻塞态消光仅由偏振器消光比来定义，并且在这些低激光强度下证明了亚秒切换。响应足够快，可以保护CCD相机免受激光损伤。光开关时间取决于温度和激光功率。这种自动光开关装置为被动激光保护提供了一种令人兴奋的方法。
An all-optical switchable twisted nematic liquid crystal system has been designed for use as a laser protection filter, which takes advantage of light-induced modification of liquid crystal order. The filter employs photochromic azo-doped liquid crystal mixtures that have been optically characterized and incorporated into a laser filter device. The ability to switch between transmission and blocking modes is shown to occur, even for incredibly low intensity (0.5 mW) irradiation with a continuous 405 nm laser. The blocking-state extinction is defined only by the polarizer extinction ratio, and sub-second switching is demonstrated for these low laser intensities. The response is sufficiently fast to provide protection for CCD cameras against laser damage. The optical switching time is shown to depend on both temperature and laser power. This automatic photo-switchable device offers an exciting approach for passive laser protection.