公开(公告)号：US11444427B2

公开(公告)日：2022-09-13

申请号：US15776312

申请日：2016-11-15

Applicant: Kent State University

Inventor： Jie Xiang ,  Andrii Varanytsia ,  Fred Minkowski ,  Oleg D. Lavrentovich ,  Peter Palffy-Muhoray ,  Corrie T. Imrie ,  Daniel E. Paterson ,  John M. Storey

IPC: G02F1/13 ,  H01S3/131 ,  C09K19/36 ,  C09K19/58 ,  G02F1/1343 ,  G02F1/137 ,  H01S3/094 ,  H01S3/16

Abstract: A lasing device includes an active layer comprising a cholesteric liquid crystal material and a laser dye, and a liquid crystal cell including spaced apart substrates defining a cell gap in which the active layer is disposed. The substrates include electrodes arranged to bias the active layer into an oblique helicoidal (ChOH) state. At least one substrate of the liquid crystal cell is optically transparent for a lasing wavelength range of the device.

公开(公告)号：US09732277B2

公开(公告)日：2017-08-15

申请号：US15053643

申请日：2016-02-25

Applicant: Kent State University

Inventor： Oleg D. Lavrentovich ,  Jie V. Xiang ,  Sergij V. Shiyanovskii ,  Corrie T. Imrie ,  Daniel A. Paterson ,  John M. Storey

IPC: C09K19/14 ,  C09K19/58 ,  G02F1/1343 ,  G02F1/137 ,  C09K19/04

CPC classification number: C09K19/586 ,  C09K19/14 ,  C09K2019/0444 ,  G02F1/134363 ,  G02F1/13718

Abstract: A liquid crystal cell includes substrates defining a gap and electrodes having one of (i) an in-plane geometry generating an electric field parallel with the substrates and (ii) a top-down geometry generating an electric field across the gap between the two spaced apart substrates. A liquid crystal material disposed in the gap between the substrates comprises a chiral nematic material formed by a mixture of: 1-(4-cyanobiphenyl-4′-yl)-6-(4-cyanobiphenyl-4′-yloxy)hexane (CB6OCB) or α,ω-bis(4,4-cyanobiphenyl)nonane (CB9CB) dimeric liquid crystal material; at least one additional dimeric liquid crystal material; and a chiral dopant. The liquid crystal material within an operational range of electric field applied by the electrodes exhibits a heliconical state with an oblique angle helicoid director whose helicoid axis is oriented parallel with the electric field and whose helicoid pitch is sized to provide diffraction or Bragg reflection of light in a spectral range of interest impinging on one of the substrates of the liquid crystal cell.

公开(公告)号：US20180323570A1

公开(公告)日：2018-11-08

申请号：US15776312

申请日：2016-11-15

Applicant: Kent State University

Inventor： Jie Xiang ,  Andrii Varanytsia ,  Fred Minkowski ,  Oleg D. Lavrentovich ,  Peter Palffy-Muhoray ,  Corrie T. Imrie ,  Daniel E. Paterson ,  John M. Storey

IPC: H01S3/131 ,  C09K19/36 ,  C09K19/58 ,  G02F1/1343 ,  H01S3/16 ,  H01S3/094 ,  G02F1/137

CPC classification number: H01S3/131 ,  C09K19/36 ,  C09K19/586 ,  C09K19/60 ,  C09K2019/0444 ,  G02F1/1334 ,  G02F1/1343 ,  G02F1/134309 ,  G02F1/137 ,  G02F1/13718 ,  G02F2202/04 ,  H01S3/094 ,  H01S3/1611 ,  H01S3/1643 ,  H01S3/1686

Abstract: A lasing device includes an active layer comprising a cholesteric liquid crystal material and a laser dye, and a liquid crystal cell including spaced apart substrates defining a cell gap in which the active layer is disposed. The substrates include electrodes arranged to bias the active layer into an oblique helicoidal (ChOH) state. At least one substrate of the liquid crystal cell is optically transparent for a lasing wavelength range of the device.

公开(公告)号：US20160252755A1

公开(公告)日：2016-09-01

申请号：US15053643

申请日：2016-02-25

Applicant: Kent State University

Inventor： Oleg D. Lavrentovich ,  Jie V. Xiang ,  Sergij V. Shiyanovskii ,  Corrie T. Imrie ,  Daniel A. Paterson

IPC: G02F1/137 ,  C09K19/58 ,  C09K19/22 ,  G02F1/1343

CPC classification number: C09K19/586 ,  C09K19/14 ,  C09K2019/0444 ,  G02F1/134363 ,  G02F1/13718

Abstract: A liquid crystal cell includes substrates defining a gap and electrodes having one of (i) an in-plane geometry generating an electric field parallel with the substrates and (ii) a top-down geometry generating an electric field across the gap between the two spaced apart substrates. A liquid crystal material disposed in the gap between the substrates comprises a chiral nematic material formed by a mixture of: 1-(4-cyanobiphenyl-4′-yl)-6-(4-cyanobiphenyl-4′-yloxy)hexane (CB6OCB) or α,ω-bis(4,4-cyanobiphenyl)nonane (CB9CB) dimeric liquid crystal material; at least one additional dimeric liquid crystal material; and a chiral dopant. The liquid crystal material within an operational range of electric field applied by the electrodes exhibits a heliconical state with an oblique angle helicoid director whose helicoid axis is oriented parallel with the electric field and whose helicoid pitch is sized to provide diffraction or Bragg reflection of light in a spectral range of interest impinging on one of the substrates of the liquid crystal cell.

Abstract translation: 液晶单元包括限定间隙的基板和电极，其具有以下之一：（i）产生与基板平行的电场的平面内几何形状，以及（ii）自上而下的几何形状，跨越两个间隔开的间隙产生电场 分开的基板。 设置在基板之间的间隙中的液晶材料包括由以下混合物形成的手征向列相材料：1-（4-氰基联苯-4'-基）-6-（4-氰基联苯-4'-基氧基）己烷（CB6OCB ）或α，ω-双（4,4-氰基联苯）壬烷（CB9CB）二聚液晶材料; 至少一种另外的二聚液晶材料; 和手性掺杂剂。 在由电极施加的电场的操作范围内的液晶材料呈现出具有斜角螺旋导向器的螺旋状态，其螺旋轴线与电场平行取向，并且其螺旋螺距的尺寸设置为提供光的衍射或布拉格反射 感兴趣的光谱范围在液晶单元的一个基板上。