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A dye self-polymerized thin film random laser and its preparation method

A random laser and self-aggregation technology, applied in the laser field, can solve the problem of high random laser threshold, and achieve the effects of lowering the preparation cost, lowering the threshold and simplifying the preparation process.

Active Publication Date: 2020-01-03
SOUTHEAST UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In addition, the article "OPTICS LETTERS, 2015, 40, 1552-1555" reported that when the nonlinear optical dye DCNP is mixed into the film, when the dye concentration is very high (the mass ratio of the dye DCNP to the film PMMA is 2%), due to the weight of the dye Crystallization can form micro-nano crystals and emit random laser light, but the threshold of random laser light is still very high (7.5mJ / cm 2 )

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  • A dye self-polymerized thin film random laser and its preparation method
  • A dye self-polymerized thin film random laser and its preparation method

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Embodiment 1

[0032] Such as figure 1 with 2 As shown, a dye self-polymerization thin-film random laser includes an external pump light 1 and a thin-film sample 3; the thin-film sample is composed of a glass negative 5 and a PDMS thin film 7, and the glass negative 5 and the PDMS thin-film 7 together form a leaky waveguide structure; the PDMS film 7 contains spontaneously aggregated PM597 dye micro-nano crystals 6-1, 6-2, 6-3; the dye micro-nano crystals are formed by spontaneous aggregation of dye molecules, and this micro-nano crystals are formed in It acts as a scattering medium and a gain medium at the same time during the random laser emission process. At the same time, the leaky waveguide structure jointly formed by the glass substrate 5 and the PDMS thin film 7 confines the pump light and provides optical feedback for the formation of random laser light. The green light with a wavelength of 532nm output by the Nd:YAG laser passes through the external pump light path, and finally fo...

Embodiment 2

[0034] Preparation method of dye self-polymerized thin film random laser:

[0035] (1) Mix PDMS prepolymer A and toluene solvent in a mass ratio of 1:6, and stir with a magnetic stirrer for 20 minutes to make the solution evenly mixed;

[0036] (2) Add PM597 dye molecules to the mixed solution, and ultrasonicate for 10min-20min;

[0037] (3) After ultrasonication, add PDMS curing agent B, the mass ratio of PDMS curing agent B and PDMS prepolymer A is 1:8, stir for 1 hour; mix the solution evenly;

[0038](4) Add the mixed solution obtained in step (3) evenly dropwise onto a pre-cleaned 2cm*3cm glass negative, and let stand overnight to remove air bubbles and volatilize the toluene.

[0039] (5) Heat the glass negative film dripped with the mixed solution overnight at 70°C for 8 hours to evaporate excess toluene, and solidify the mixed solution to form a film on the glass negative film to prepare a PDMS film sample.

[0040] (6) The thin film sample prepared in step (5) is co...

Embodiment 3

[0043] Preparation method of dye self-polymerized thin film random laser:

[0044] (1) Mix PDMS prepolymer A and toluene solvent in a mass ratio of 2:3, stir with a magnetic stirrer for 40 minutes, and mix the solution evenly;

[0045] (2) Add PM597 dye molecules to the mixed solution, and sonicate for 20 minutes;

[0046] (3) After ultrasonication, add PDMS curing agent B, the mass ratio of PDMS curing agent B and PDMS prepolymer A is 1:10, stir for 2 hours; mix the solution evenly;

[0047] (4) Add the mixed solution obtained in step (3) evenly dropwise onto a pre-cleaned 2cm*3cm glass negative, and let stand overnight to remove air bubbles and volatilize the toluene.

[0048] (5) Heat the glass negative film dripped with the mixed solution overnight at 90°C for 6 hours to evaporate excess toluene, and solidify the mixed solution to form a film on the glass negative film to prepare a PDMS film sample.

[0049] (6) The thin film sample prepared in step (5) is combined with ...

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Abstract

The invention discloses a dye auto-polymerized thin film random laser. The dye auto-polymerized thin film random laser comprises external pump light and a thin film sample, wherein the thin film sample consists of a glass negative and a PDMS thin film; the glass negative and the PDMS thin film together form a leakage waveguide structure; and the PDMS thin film contains an auto-aggregated dye micro-nano crystal which is formed by auto aggregation of PM597 dye molecules. The invention furthermore discloses a preparation method of the dye auto-polymerized thin film random laser. According to the dye auto-polymerized thin film random laser, the low-concentration dye molecules are low in energy of self-absorption loss, so that the threshold value of the random laser is reduced and then the energy loss of the pump light is reduced; the solubility of the dye molecules change and the dye molecules aggregate to form the micro-nano crystal which serves as a scattering medium and a gain medium in a random laser outgoing process, so that the preparation method of the random laser is simplified; and the thin film random laser is low in threshold value and simple in preparation process.

Description

technical field [0001] The invention relates to the field of laser technology, in particular to a dye self-polymerization film random laser and a preparation method thereof. Background technique [0002] In recent years, random lasers have become a hot research field in the international laser community. 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 without Additional resonator. Random laser radiation can be observed in all directions, and when the viewing angle is different, the spectral line structure and emission intensity will also change, and the luminescence characteristics fluctuate randomly in time, space, and spectrum. Due to its special feedback mechanism, random laser has th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01S3/16
CPCH01S3/168H01S3/169
Inventor 叶莉华冯洋洋王著元程志祥崔一平
Owner SOUTHEAST UNIV
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