Absorption of light by a molecule sitting in a liquid crystalline (LC) medium firstly affects the orientational ordering of its closest neighbours. A generalised Light-Induced Order Modification (LIOM) model has been developed that accounts for the changes of the refractive indices of a thin LC layer resulted from the light-stimulated modulation of the LC order parameter. The LIOM-mechanism explains experimentally observed large optical nonlinearities with extremely fast as for the LC system recording times. Due to the efficient local response a very high resolution has been achieved (<1 μm) accompanied with quite high diffraction efficiency within the very wide intensity range of the actinic light. Being strictly local, the LIOM-mechanism allows for a spatial resolution opening new possibilities for volume grating recording. Effective at any wavelength it could also be applied for creation of arbitrary phase profiles over extensive areas as requested in several applications for light beam manipulation.

坐在液晶（LC）介质中的分子对光的吸收首先会影响其最近邻域的取向顺序。已经开发了一种广义的光诱导阶修正（LIOM）模型，该模型考虑了由LC阶参数的光刺激调制导致的薄LC层的折射率变化。LIOM机理解释了实验观察到的大光学非线性，并且与LC系统记录时间一样快。由于有效的局部响应，在非常宽的光化强度范围内，可以实现非常高的分辨率（<1μm），并具有很高的衍射效率。LIOM机制严格来说是局部的，它提供了空间分辨率，为体积光栅记录开辟了新的可能性。