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Ultrahigh-polarity chiral liquid crystal material, liquid crystal laser and preparation method of liquid crystal laser

A chiral liquid crystal and laser technology, applied in liquid crystal materials, chemical instruments and methods, nonlinear optics, etc., can solve the problems of inability to fundamentally solve, low luminous efficiency, poor stability, etc., to avoid low luminous efficiency, easy to achieve Membrane properties, the effect of improving stability

Active Publication Date: 2021-02-05
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, this technology inevitably uses laser dye doping to provide gain, and the problems of low luminous efficiency, poor stability and fluorescent bleaching cannot be fundamentally solved, and there are still great limitations in popularization and application.

Method used

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  • Ultrahigh-polarity chiral liquid crystal material, liquid crystal laser and preparation method of liquid crystal laser
  • Ultrahigh-polarity chiral liquid crystal material, liquid crystal laser and preparation method of liquid crystal laser
  • Ultrahigh-polarity chiral liquid crystal material, liquid crystal laser and preparation method of liquid crystal laser

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0109] The preparation method of polar cholesteric liquid crystal with chiral molecular doping concentration of 10% is as follows:

[0110] Using chloroform as a solvent, prepare a certain mass fraction of chiral small molecules and polar nematic liquid crystal solutions respectively, and then prepare the mixture solution according to the mass ratio of chiral molecules: polar nematic liquid crystals as 1 / 9, and vacuum dry A homogeneous mixture was obtained, labeled 10% S1 / RM734.

[0111]

[0112] is the polar nematic liquid crystal, R 1 , R 2 for methyl

[0113]

[0114] is the chiral molecule, R 1 , R 2 for-C 6 h 13

[0115] The phase transition temperature range of cholesteric phase was determined by polarizing microscope and DSC test, and the effect of chiral dopant concentration on the pitch was determined by Cano Wedge method.

[0116] Wherein, the central wavelength λc of the reflection spectrum of the circularly polarized light selectively reflected by the...

Embodiment 2

[0118] The preparation method of polar cholesteric liquid crystal with chiral molecular doping concentration of 5% is as follows:

[0119] Using chloroform as a solvent, prepare a certain mass fraction of chiral small molecules and polar nematic liquid crystal solutions respectively, and then prepare the mixture solution according to the chiral molecule: polar nematic liquid crystal mass ratio of 1 / 19, and vacuum dry A homogeneous mixture was obtained, labeled 5% S1 / RM734.

Embodiment 3

[0121] The preparation method of polar cholesteric liquid crystal with chiral molecular doping concentration of 20% is as follows:

[0122] Using chloroform as a solvent, prepare a certain mass fraction of chiral small molecules and polar nematic liquid crystal solutions, and then prepare a mixture solution with a mass ratio of chiral molecules: polar nematic liquid crystals of 1 / 4, and vacuum dry A homogeneous mixture was obtained, labeled 20% S1 / RM734.

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Abstract

The invention discloses an ultrahigh-polarity chiral liquid crystal material, a liquid crystal laser and a preparation method of the liquid crystal laser. Cholesteric liquid crystals with ultrahigh dielectric constants (epsilon-104) and ultrahigh polarity are obtained by doping polar nematic liquid crystals with chiral molecules. The material is different from common cholesteric liquid crystals, retains an ultra-strong nonlinear optical effect, and can excite high-strength second harmonics (ten times or more of quartz crystals). Based on the amplification effect of cholesteric phase periodicity on laser, the material can be applied to the fields of laser high-order frequency multiplication modulation, harmonic imaging and the like. The cholesteric phase molecular pitch is tuned through theconcentration of a chiral agent, so that the continuous regulation and control of the reflection wavelength of 100-1000 nm are realized. Meanwhile, the material has the characteristic of low temperature sensitivity, and is beneficial to stable optical signal output of the device in a wide temperature range.

Description

technical field [0001] The invention belongs to the field of preparation and application of liquid crystal materials, and in particular relates to an ultrahigh polarity chiral liquid crystal material, a liquid crystal laser and a preparation method thereof. Background technique [0002] Liquid crystal is an important optoelectronic material, which has extremely important application value in the fields of optoelectronic display and spatial light modulation. Generally, nematic liquid crystals only have an orientation sequence but not a position sequence. Although a single molecule has a permanent dipole moment, the distribution probability of the director upward and downward is the same, so the polarity of the entire liquid crystal system is destructive. , does not have ferroelectric properties. [0003] In 2017, Richard Mandle and John Goodby of the University of York, UK, synthesized a wedge-shaped molecule with a large electric dipole. The study found that the molecule b...

Claims

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Application Information

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IPC IPC(8): C09K19/20G02F1/1337G02F1/137
CPCC09K19/20G02F1/13718G02F1/133723C09K2019/2078C09K19/2007C09K2019/3422C09K19/2028C09K19/3402C09K19/586G02F1/133784G02F1/133788
Inventor 谢晓晨黄明俊西川浩矢李金星向后润一周俊琛赵秀虎
Owner SOUTH CHINA UNIV OF TECH
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