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Flexible film random laser device adjustable in polarization degree and preparation method thereof

A random laser and flexible film technology, applied in the field of random laser, can solve the problems of narrow polarization adjustment range, unstable laser wavelength, complicated preparation process, etc., and achieve the effects of stable laser wavelength, simple structure and simple preparation process.

Active Publication Date: 2016-07-13
SOUTHEAST UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to provide a flexible thin-film random laser with adjustable polarization degree and its preparation method, so as to solve the problem of high energy consumption, complex structure and adjustable polarization degree in the prior art when realizing linearly polarized random laser. In the case of random laser, the polarization adjustment range is too narrow, the laser wavelength is unstable and the intensity is weakened, and the preparation process is complicated, etc.

Method used

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  • Flexible film random laser device adjustable in polarization degree and preparation method thereof

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preparation example Construction

[0049] The preparation method of the above-mentioned flexible thin-film random laser with adjustable degree of polarization comprises the following steps:

[0050] a. The laser dye and the nematic liquid crystal are uniformly mixed under ultrasonic conditions to form a dye-nematic liquid crystal mixed solution;

[0051] b. Add the dye nematic liquid crystal mixed solution and polyhydric alcohol into the aqueous solution of polyvinyl alcohol, heat and stir evenly;

[0052] c. The homogeneously mixed polyvinyl alcohol aqueous solution, polyhydric alcohol, and dye nematic liquid crystal solution are prepared into an emulsion containing dye liquid crystal droplets through ultrasonic treatment;

[0053] d. performing film-forming treatment on the emulsion containing the dye liquid crystal micro-droplets, and evaporating water to obtain a polyvinyl alcohol film containing the dye liquid crystal micro-droplets.

[0054] In step b, the heating temperature is 50°, and the stirring tim...

Embodiment 1

[0058] A polarization-tunable flexible thin-film random laser containing polyvinyl alcohol (n p =1.49), glycerin, laser dye PM597, nematic liquid crystal E7 (n e = 1.75, n o = 1.52). Concrete preparation process is as follows:

[0059] (1) The laser dye PM597 is ultrasonically mixed with the nematic liquid crystal E7, wherein the laser dye PM597 accounts for 1wt%;

[0060] (2) Add the dye liquid crystal mixed solution and glycerin to an aqueous solution containing 15wt% polyvinyl alcohol, heat to 50°, stir for 1 hour, and mix well;

[0061] (3) Utilize an ultrasonic cell breaker (power 325W, frequency 20KHz, ultrasonic 2s, interval 3s, total time 3min) to disperse the dye liquid crystal mixture to prepare a viscous emulsion containing dye liquid crystal droplets;

[0062] (4) Put the liquid crystal emulsion on the glass substrate by the wet film-making method to form a film with a length of 1cm, a width of 0.5cm, and a thickness of 40um. The film is peeled off from the gla...

Embodiment 2

[0067] A polarization-tunable flexible thin-film random laser containing polyvinyl alcohol (n p =1.49), glycerin, laser dye PM597, nematic liquid crystal E7 (n e = 1.75, n o = 1.52). Concrete preparation process is as follows:

[0068] (1) The laser dye PM597 is ultrasonically mixed with the nematic liquid crystal E7, wherein the laser dye PM597 accounts for 0.1wt%;

[0069] (2) Add the dye liquid crystal mixed solution and glycerin to an aqueous solution containing 15wt% polyvinyl alcohol, heat to 50°, stir for 1 hour, and mix well;

[0070] (3) Utilize an ultrasonic cell breaker (power 325W, frequency 20KHz, ultrasonic 2s, interval 3s, total time 3min) to disperse the dye liquid crystal mixture to prepare a viscous emulsion containing dye liquid crystal droplets;

[0071] (4) Put the liquid crystal emulsion on the glass substrate by the wet film-making method to form a film with a length of 1cm, a width of 0.5cm, and a thickness of 10um, and peel the film from the glass ...

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Abstract

The invention discloses a flexible film random laser device adjustable in polarization degree and a preparation method thereof. The random laser device is of a film-shaped structure and is prepared from polyvinyl alcohol, polyalcohol and dye nematic-phase liquid crystal micro-droplets, wherein the polyalcohol and the dye nematic-phase liquid crystal micro-droplets are located in a film prepared from the polyvinyl alcohol. The flexible film random laser device changes orientation of nematic-phase liquid crystal molecules in the polyvinyl alcohol film and achieves random laser emergence adjustable in polarization degree by mechanically stretching the polyvinyl alcohol film containing the dye nematic-phase liquid crystal micro-droplets under the condition of laser pumping based on optical anisotropy of nematic-phase liquid crystal, and the random laser polarization direction is parallel to the stretching direction. The flexible film random laser device can achieve the functions of random laser wavelength stabilization and continuous and adjustable polarization degree, has the advantages of being low in cost, simple in structure, convenient to achieve and the like and has the better application value on the aspects of laboratory polarization calibration, system-level performance detection and the like of displays, sensors and polarizing optical remote sensors.

Description

technical field [0001] The invention relates to the field of random lasers, in particular to a flexible thin-film random laser with adjustable polarization degree and a preparation method thereof. Background technique [0002] In recent years, random lasers have become a hot research field in the international laser community. The random laser radiation originates from the activated disordered medium, that is, the radiated light is optically fed back by multiple scattering in the activated disordered medium, so as to obtain a large gain, so no external resonant cavity is required. Polymer-dispersed liquid crystal random lasers dope the laser gain medium into the liquid crystal material and the polymer, and use the mismatch between the refractive index of the liquid crystal molecule in the long axis direction and the polymer to provide scattering, thereby forming multiple feedbacks and gain. It emits random laser light and has the characteristics of small size and easy integ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01S3/101G02F1/139
CPCG02F1/139H01S3/101
Inventor 叶莉华刘波王著元顾兵李芳杰崔一平
Owner SOUTHEAST UNIV
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