Jull Ethan I L, Gleeson Helen F
Appl Opt. 2017 Oct 10;56(29):8061-8066. doi: 10.1364/AO.56.008061.
The use of a liquid crystal Lyot filter as a simple and compact switchable laser protection system is demonstrated. The system OFF state exhibits a wavelength-independent transmission and switches to an ON state, which rejects a selected wavelength. The response time of the switchable system is <110 ms, depending on the rejected wavelength, with the ability for faster switching of <5 ms when using a lower-order rejection band. A rejection tuning range between 480 and 640 nm is demonstrated, and the potential to operate outside of the visible spectrum is discussed. In the ON state, the transmission at the rejected wavelength was found to be effectively limited by the polarizer extinction ratio, while transmission at other wavelengths allows for partial observations through the system even when in protection mode.
展示了使用液晶利奥特滤波器作为一种简单紧凑的可切换激光防护系统。该系统的关闭状态呈现出与波长无关的透射率，并切换到开启状态，此时会滤除选定的波长。可切换系统的响应时间小于110毫秒，具体取决于被滤除的波长，当使用低阶抑制带时，能够实现小于5毫秒的更快切换。展示了480至640纳米的抑制调谐范围，并讨论了在可见光谱之外运行的潜力。在开启状态下，发现被滤除波长处的透射率实际上受到偏振器消光比的限制，而即使在保护模式下，其他波长处的透射率也允许通过该系统进行部分观测。
