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Dye-doped liquid crystal random laser based on multiphoton absorption and its preparation method

A multi-photon absorption and random laser technology, which is applied in the field of lasers, can solve the problems of mutual interference between photo-orientation and stimulated emission processes, and achieve the effects of preventing material denaturation, improving pumping efficiency, and reducing damage

Active Publication Date: 2019-07-12
SOUTHEAST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] Purpose of the invention: The purpose of the present invention is to address the deficiencies of the prior art, to provide a dye-doped liquid crystal random laser based on multiphoton absorption and its preparation method, which can solve the problem of mutual interference between photo-alignment and stimulated emission processes

Method used

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  • Dye-doped liquid crystal random laser based on multiphoton absorption and its preparation method
  • Dye-doped liquid crystal random laser based on multiphoton absorption and its preparation method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] 1. Clean the cut glass substrate 1 (20mm*15mm) ultrasonically for 20 minutes with acetone, ethanol and deionized water and dry it;

[0026] 2. At 85°C, configure a saturated aqueous solution of surface polymer material 5 (polyvinyl alcohol PVA) and light control dye 3 (azo dye methyl red), mix evenly at a weight ratio of 3:50, and spin coat on a clean surface. The surface of the glass substrate 1 is dried for 24 hours to form a thin film;

[0027] 3. Use the short-wavelength laser (532nm) generated by the Nd:YAG pulsed laser to irradiate the glass substrate 1 after the film curing treatment, and the light-controlled dye 3 undergoes cis-trans isomerism under the light to complete the photo-orientation;

[0028] 4. Ultrasonic mixing of liquid crystal 2 and laser dye 4 (rhodamine 6G dye) with a fluorescence emission range of 620nm to form a dye-doped liquid crystal 2 mixed solution, where laser dye 4 accounts for 0.2wt% in the dye-doped liquid crystal 2 mixed solution, spi...

Embodiment 2

[0031] 1. The cut glass substrate (20mm*15mm) is ultrasonically cleaned with acetone, ethanol and deionized water for 20 minutes and dried;

[0032] 2. At 85°C, prepare a saturated aqueous solution of surface polymeric material (polymethyl methacrylate PMMA) and light control dye (azo dye methyl red), mix evenly at a weight ratio of 4:50, and spin coat on Dry the surface of the clean glass substrate for 24 hours to form a thin film;

[0033] 3. Use the short-wavelength laser (500nm) generated by the semiconductor-pumped solid-state laser to irradiate the glass substrate after the film curing treatment, and the light-controlled dye (azo dye methyl red) undergoes cis-trans isomerism under the light to complete the photo-orientation;

[0034] 4. Ultrasonic mixing of liquid crystal and laser dye (DCM dye) with a fluorescence emission range of 550nm to form a dye-doped liquid crystal mixed solution. The laser dye accounts for 0.5wt% in the dye-doped liquid crystal mixed solution, a...

Embodiment 3

[0037] 1. The cut glass substrate (20mm*15mm) is ultrasonically cleaned with acetone, ethanol and deionized water for 20 minutes and dried;

[0038] 2. At 85°C, configure a saturated aqueous solution of surface polymeric material (polymethyl methacrylate PMMA) and light control dye (azo dye methyl red), mix evenly at a weight ratio of 5:50, and spin coat on Dry the surface of the clean glass substrate for 24 hours to form a thin film;

[0039] 3. The short-wavelength laser (550nm) generated by the semiconductor-pumped solid-state laser is used to irradiate the glass substrate after the film curing treatment, and the light-controlled dye (azo dye methyl red) undergoes cis-trans isomerism under the light to complete the photo-orientation;

[0040] 4. Ultrasonic mixing of liquid crystal and laser dye (rhodamine 6G dye) with a fluorescence emission range of 700nm to form a dye-doped liquid crystal mixed solution. The laser dye accounts for 2wt% in the dye-doped liquid crystal mixe...

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Abstract

The invention provides a multi-photon absorption-based dye-doped liquid crystal random laser. The multi-photon absorption-based dye-doped liquid crystal random laser comprises a glass substrate, a curing layer and a mixed layer, wherein the curing layer and the mixed layer are sequentially attached onto the glass substrate, the curing layer is a thin film formed by curing a saturated solution of alight-controlled dye and a surface polymer material, and the mixed layer is a mixed solution layer of a liquid crystal and a laser dye. On the basis of a multi-photon absorption effect, pumping lightis relatively low in loss at a surface layer of the laser in a long wave band, can penetrate through the surface and enters a medium, so that multi-photon absorption is generated at a relatively deepposition of the laser, no special requirement on the thickness of the random laser is generated, and the pumping efficiency can be effectively improved; and moreover, long-band photons of a multi-photon pumping light source are relatively low in energy, damage to the material can be reduced, and the problem of material degeneration caused by short-band photons can be prevented.

Description

technical field [0001] The invention relates to a laser, in particular to a random laser and a preparation method thereof. Background technique [0002] Since random laser does not require an external resonator, its manufacturing cost is low, its size is small, and its emission characteristics such as wavelength can be adjusted by adjusting its material parameters, which has great research significance and application value. There are many significant differences between random lasers and traditional lasers in terms of generation mechanism and luminescence characteristics. Random laser radiation originates from activated disordered media, and provides optical feedback through multiple scattering of radiated light in the media, thereby obtaining greater gain. [0003] Liquid crystal random lasers are random lasers that use liquid crystals as a disordered scattering medium. The feedback of the laser comes from the multiple scattering of photons between liquid crystal molecules...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01S3/30H01S3/08
CPCH01S3/08H01S3/307
Inventor 叶莉华刘雨璇孙嘉楠吕昌贵崔一平
Owner SOUTHEAST UNIV