Andreev Alexander L, Andreeva Tatiana B, Kompanets Igor N, Zalyapin Nikolay V
Appl Opt. 2018 Feb 20;57(6):1331-1337. doi: 10.1364/AO.57.001331.
Spatially inhomogeneous modulation of a phase delay with the depth of the order π or more makes it possible to destroy phase relations in a laser beam passing through an electro-optical cell with the ferroelectric liquid crystal (FLC) and, as a consequence, to suppress speckle noise in images formed by this beam. Such a modulation is a consequence of chaotic changes in the position of the scattering indicatrix of helix-free FLC, when an electro-optical cell is simultaneously supplied with a low-frequency and high-frequency bipolar control voltage. In this work, the phase modulation and effective suppressing of the speckles are realized using a new type of helix-free FLC material with periodic deformations of smectic layers.
相位延迟随深度呈空间非均匀调制，调制量达到π或更大时，能够破坏通过含有铁电液晶（FLC）的电光盒的激光束中的相位关系，从而抑制该光束所形成图像中的散斑噪声。这种调制是无螺旋FLC散射指示体位置发生混沌变化的结果，此时电光盒同时被施加低频和高频双极控制电压。在这项工作中，利用一种具有近晶层周期性变形的新型无螺旋FLC材料实现了相位调制和对散斑的有效抑制。
