Nankai University

Taishan Sports Industry Group Co., Ltd.

Yongfa Kong

Jingjun Xu

Shaolin Chen

Wei Li

Guangyin Zhang

Hui Huang

Bin Shi

Qiang Wu

Qian Sun

Xinzheng Zhang

Baiquan Tang

Guangao Li

Dahuai Zheng

Shiguo Liu

Xiaojun Chen

Wei Cui

Peiming Xu

Ziheng Huang

Zhiyong Bian

Zhenhua Wang

Ling Zhang

Irena Drevensek-Olenik

Hongde Liu

The method for orientation of liquid crystals in a micro/nano region on the basis of laser direct writing and a system thereof includes a laser direct writing system employed to build a micro/nano structure. Liquid crystal molecules in a micro/nano structural region perform self-orientation; and the orientation of liquid crystals is generated by fine structures on side walls of polymer strips which form the micro/nano structure. The dimension of the micro/nano region varies from the micrometer magnitude to the nanometer magnitude exceeding the diffraction limit. The orientating direction can be adjusted and controlled in the micro/nano region, which is favorable for the miniaturization of the liquid crystal display devices and the orientation of the complicated three-dimensional liquid crystal structure.

Method for orientation of liquid crystals in micro/nano region on basis of laser direct writing and system thereof

A bismuth and magnesium co-doped lithium niobate crystal includes LiCO, NbO, BiOand MgO, wherein the molar ratio of [Li] and [Nb] is 0.90-1.00, the molar percentage of BiOin the mixture is 0.25-0.80%, and the molar percentage of MgO in the mixture is 3.0-7.0%. The bismuth and magnesium co-doped lithium niobate crystal has enhanced photorefraction, improved photorefractive sensitivity, shortened holographic grating saturation writing time, and the photorefractive diffraction efficiency can reach up to 17%. The response time is only 170 ms, when the holographic storage experiment is carried out using 488 nm continuous laser. Therefore, this crystal can be used in the field of holographic imaging.

Bismuth and magnesium co-doped lithium niobate crystal, preparation method thereof and application thereof

This invention relates to the field of materials of the photorefractive crystal. The composition of these crystals is Li Nb O : Fe , M , where M can be magnesium, indium, or zinc; when using q to denote the ion valence of M (q&equals;2 when M is Mg or Zn, and q&equals;3 when M is In), the values of x, y, m, and n are in the range of 0.05&lE;x&lE;0.13, 0.00&lE;y&lE;0.01, 5.0&times;10 &lE;m&lE;7.5&times;10 , and 0.02&lE;qn&lE;0.13. This invention greatly improves the photorefractive properties of LiNbO crystals: makes it have a high diffraction efficiency (more than 68%), a fast response speed for photorefraction (an order of magnitude faster than iron doped LiNbO ), and a high resistance to optical scattering (the light intensity threshold to photorefractive fan scattering near two orders of magnitude larger than LiNbO : Fe). This invention is an excellent three-dimensional optical storage material and has a vast potential market.

Doubly doped lithium niobate crystals

Growing community of inventors

Tianjin, China

Yongfa Kong