Liquid crystal photonic crystal fiber random laser and its manufacturing method

A photonic crystal fiber and random laser technology, which is applied in the field of optical lasers, can solve the problems of weak light intensity and uncertainty of random laser emission direction, and achieve the effect of improving laser intensity.

Active Publication Date: 2019-07-16
HARBIN ENG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Through searching, all these studies are based on the research on the structure of the liquid crystal cell, and there is a characteristic that the emission direction of the random laser is uncertain, and the light intensity is the main problem.

Method used

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  • Liquid crystal photonic crystal fiber random laser and its manufacturing method
  • Liquid crystal photonic crystal fiber random laser and its manufacturing method
  • Liquid crystal photonic crystal fiber random laser and its manufacturing method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Liquid crystal photonic crystal fiber random laser, including hollow photonic crystal fiber 1, dye-doped cholesteric liquid crystal microspheres and polyvinyl alcohol aqueous solution 2, the dye-doped cholesteric liquid crystal microspheres are composed of large-sized doped Dye cholesteric liquid crystal microspheres 3 and small-sized dye-doped cholesteric liquid crystal microspheres 4; inject the dye-doped cholesteric liquid crystal microspheres and the aqueous solution 2 of polyvinyl alcohol into the hollow photonic crystal fiber 1 after stirring In the middle of the core.

[0030] The core size of the hollow photonic crystal fiber 1 is 50-200 microns, and five to seven layers of air holes are arranged in a triangular shape around the core.

[0031] The cholesteric liquid crystal microspheres doped with dyes are cholesteric liquid crystal microspheres doped with laser dyes.

[0032] The diameter of the dye-doped cholesteric liquid crystal microspheres is 0.5-10 micro...

Embodiment 2

[0043] After the aqueous solution of dye-doped cholesteric liquid crystal and polyvinyl alcohol is stirred, the liquid crystal droplets are suspended in the aqueous solution of polyvinyl alcohol in the form of microspheres of different sizes, and the larger-sized droplets in the microspheres have a good helical structure , while small-sized droplets have no regular helical structure due to the length of the pitch. Such larger liquid crystal micro-droplets play the role of gain, and small micro-droplets play the role of dispersion, and the aqueous solution of polyvinyl alcohol can make the liquid crystal micro-droplets exist in the form of intact spheres. Due to the scattering effect of small droplets, the direction of random emission is uncontrollable. The microstructure of the photonic crystal fiber reflects the emitted light, thereby controlling the transmission direction of the emitted light along the fiber, and thus improving the emission efficiency of the laser.

[0044]...

Embodiment 3

[0051] Same as embodiment 2, its difference mainly lies in:

[0052] The fiber core is selected as a hollow photonic crystal fiber with a core diameter of 50-200 microns, and five to seven layers of air holes are arranged in a triangular shape around the core;

[0053] The chiral agent is used to configure the cholesteric liquid crystal, and the mass percentage concentration of the chiral agent is adjusted to obtain a photonic band gap position consistent with the forbidden band position of the photonic crystal fiber itself. Select the laser dye whose fluorescence spectrum is in the forbidden band interval, dope it into the prepared cholesteric liquid crystal, and use ultrasonic oscillation equipment to carry out sufficient and uniform mixing;

[0054] Prepare an aqueous solution with a mass percentage of polyvinyl alcohol of 5%-15%, mix and stir with the dye-doped cholesteric liquid crystal, and the volume of the two is between 1:1 and 1:2. Liquid crystal microspheres of var...

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Abstract

The invention belongs to the technical field of optical lasers, and specifically relates to a liquid crystal photonic crystal fiber random laser and a manufacturing method therefor. The invention provides the liquid crystal fiber laser with a function of controlling the random laser emitting direction. According to the invention, the aqueous solution of cholesteric liquid crystal which is doped with a laser dye and mixed with polyvinyl alcohol is injected into a photonic crystal fiber, and the liquid crystal laser which can control the random laser emitting direction can be constructed through the light transmission characteristics of the photonic crystal fiber. Therefore, the conventional random laser emitting direction can be controlled, thereby improving the laser intensity of the photonic crystal fiber to a great extent.

Description

technical field [0001] The invention belongs to the technical field of optical lasers, and relates to a liquid crystal photonic crystal fiber random laser capable of controlling the emission direction of random laser, and also relates to a manufacturing method of the liquid crystal photonic crystal fiber random laser. [0002] technical background [0003] In the past ten years, in the research field of random media, people have discovered high-intensity stimulated radiation many times. Stimulated radiation is when the luminescent atoms in the excited state transition to the low-energy state or the ground state under the action of an external radiation field. , the phenomenon of radiating photons. At this time, the energy of the external radiation must be exactly the energy difference between the two energy levels of the atom, and the frequency, phase, propagation direction and polarization state of the photon emitted by the stimulated radiation and the external photon are al...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01S3/067G02F1/137
CPCG02F1/13718H01S3/06741
Inventor 刘永军王斐儒侯天文孙伟民
Owner HARBIN ENG UNIV
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