阅读说明：本技术 一种生物随机激光器样品的制备工艺 (Preparation process of biological random laser sample ) 是由 尚真真 戴光 王学荣 于 2020-07-17 设计创作，主要内容包括：本发明提供一种生物随机激光器样品的制备工艺,包括翅膀前处理、液晶混合溶液制备以及激光器样品制作,具体步骤为将蝴蝶翅膀放入乙醇中浸泡8小时；将浸泡后的蝴蝶翅膀使用去离子水反复冲洗20分钟；将冲洗后的蝴蝶翅膀静置在无尘环境中晾干；将晾干后的翅膀剪块后得到翅膀小块；在液晶溶液中加入染料分散液,并进行振荡后获得混合溶液；将翅膀小块固定到两块玻璃基片之间；对玻璃基片的两侧进行密封；将混合溶液滴在玻璃基片未密封的两侧,利用毛细现象将混合溶液渗透到玻璃基片之间；静置后获得激光器样品；所获得的激光器样品通过实验数据证明可以大幅度提高激光发射模式的稳定性,对于未来随机激光器的实际应用具有非常重要的指导意义。(The invention provides a preparation process of a biological random laser sample, which comprises the steps of wing pretreatment, liquid crystal mixed solution preparation and laser sample preparation, and specifically comprises the steps of soaking butterfly wings in ethanol for 8 hours; repeatedly washing the soaked butterfly wings for 20 minutes by using deionized water; standing the washed butterfly wing in a dust-free environment and airing; cutting the dried wings to obtain small wing blocks; adding a dye dispersion liquid into a liquid crystal solution, and oscillating to obtain a mixed solution; fixing the wing small block between the two glass substrates; sealing two sides of the glass substrate; dropping the mixed solution on the two unsealed sides of the glass substrate, and permeating the mixed solution between the glass substrates by utilizing the capillary phenomenon; standing to obtain a laser sample; the obtained laser sample is proved by experimental data to greatly improve the stability of a laser emission mode, and has very important guiding significance for the practical application of a random laser in the future.)

1. A preparation process of a biological random laser sample is characterized by comprising the following steps:

pretreatment of wings:

soaking butterfly wings in ethanol for 7-9 hours;

repeatedly washing the soaked butterfly wings for 10-30 minutes by using deionized water;

standing the washed butterfly wing in a dust-free environment and airing;

cutting the dried wings to obtain small wing blocks;

preparing a liquid crystal mixed solution:

adding a dye dispersion liquid into a liquid crystal solution, and oscillating to obtain a mixed solution;

laser sample preparation:

fixing the wing small block between the two glass substrates;

sealing two sides of the glass substrate;

dropping the mixed solution on the two unsealed sides of the glass substrate, and permeating the mixed solution between the glass substrates by utilizing the capillary phenomenon;

after standing, a laser sample was obtained.

2. The process of claim 1, wherein the butterfly wing is repeatedly rinsed with deionized water by placing the butterfly wing on a glass slide.

3. The process of claim 1, wherein the wing pieces have a size of 0.8-1.2 cm.

4. The process according to claim 1, wherein the dye dispersion is a DCM dye dispersion, and the steps of the process are as follows: DCM dye was dissolved in acetone to a molar volume of 10^-2The dye dispersion according to (1).

5. The process for preparing a biological random laser sample according to claim 4, wherein the liquid crystal solution is a nematic liquid crystal P0616A solution, and the specific process for preparing the liquid crystal mixed solution is as follows: 0.2 ml of dye dispersion was added to 1 ml of nematic liquid crystal P0616A solution, and the mixture was ultrasonically vibrated for 30 to 60 minutes to obtain a mixed solution.

6. The process according to claim 1, wherein the glass substrate is an ITO conductive glass substrate, the ITO conductive glass substrate has a length and a width of 2cm and a thickness of 20 μm.

7. The process according to claim 1, wherein the laser sample is obtained after the standing for 20-40 min.

Technical Field

The invention relates to the technical field of laser, in particular to a preparation process of a biological random laser sample.

Background

The random laser is a laser formed by stimulated radiation of a random medium and is called as a random laser, because the random laser has excellent characteristics and potential application values different from those of the traditional laser, many researchers begin to try to research the random laser by using semiconductor powder, liquid crystal, metal nano structures, thin films, waveguide structures and the like, the current random laser basically takes the semiconductor powder random laser as a main part, and the laser emission mode of the semiconductor powder random laser is unstable, so that the application value of the random laser cannot be completely reflected.

However, many biological materials exist in the nature and can be directly applied to the design of random lasers, the earliest research on the biological random lasers is the random laser experiment performed by Siddique et al in 1995 using chicken and pork fat tissues soaked by dyes, in recent years, biological tissues are gradually applied to the random laser experiment by researchers, for example, in 2012, Toffanin et al use fibroin as a carrier to design a single-mode emission random laser, and in 2013, Da Silva et al use fibroin to manufacture a thin film random laser based on a grating structure.

Although the stability of the laser emission mode of the bio-random laser is improved compared to that of the semiconductor powder random laser, the stability of the bio-random laser does not meet the requirement of practical application, and therefore, a random laser capable of improving the stability of the laser emission mode is needed.

Disclosure of Invention

Therefore, the invention provides a preparation process of a biological random laser sample, the random laser sample made of butterfly wings can greatly improve the stability of a laser emission mode, and the preparation process has very important guiding significance for the practical application of a random laser in the future.

The technical scheme of the invention is realized as follows:

a preparation process of a biological random laser sample comprises the following steps:

pretreatment of wings:

soaking butterfly wings in ethanol for 7-9 hours;

repeatedly washing the soaked butterfly wings for 10-30 minutes by using deionized water;

standing the washed butterfly wing in a dust-free environment and airing;

cutting the dried wings to obtain small wing blocks;

preparing a liquid crystal mixed solution:

adding a dye dispersion liquid into a liquid crystal solution, and oscillating to obtain a mixed solution;

laser sample preparation:

fixing the wing small block between the two glass substrates;

sealing two sides of the glass substrate;

dropping the mixed solution on the two unsealed sides of the glass substrate, and permeating the mixed solution between the glass substrates by utilizing the capillary phenomenon;

after standing, a laser sample was obtained.

Preferably, when the butterfly wings are repeatedly washed by deionized water, the butterfly wings are placed on the glass sheet for repeated washing.

Preferably, the wing small block size is 0.8-1.2 cm.

Preferably, the dye dispersion is a DCM dye dispersion, and the preparation steps are: DCM dye was dissolved in acetone to a molar volume of 10^-2The dye dispersion according to (1).

Preferably, the liquid crystal solution is a nematic liquid crystal P0616A solution, and the specific process for preparing the liquid crystal mixed solution is as follows: 0.2 ml of dye dispersion was added to 1 ml of nematic liquid crystal P0616A solution, and the mixture was ultrasonically vibrated for 30 to 60 minutes to obtain a mixed solution.

Preferably, the glass substrate is an ITO conductive glass substrate, the length and the width of the ITO conductive glass substrate are 2 centimeters, and the thickness of the ITO conductive glass substrate is 20 micrometers.

Preferably, the laser sample obtained after said standing is allowed to stand for a period of 20 to 40 minutes.

Compared with the prior art, the invention has the beneficial effects that:

the invention provides a preparation process of a biological random laser sample, which is based on the preparation of a butterfly wing as a random laser sample, wherein the butterfly wing is pretreated firstly, dust and impurities on the butterfly wing are taken out, meanwhile, liquid crystal is used as a scattering medium, a liquid crystal solution and a dye dispersion solution are mixed to obtain a mixed solution, two glass substrates are used as substrates, the butterfly wing is fixed on the glass substrates, and then the mixed solution is infiltrated between the glass substrates by utilizing the capillary phenomenon.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only preferred embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained according to these drawings without inventive exercise.

FIG. 1 is a flow chart of a process for preparing a sample of a biorandom laser according to the present invention;

FIG. 2 is a graph of the emission spectrum of sample 1 as a function of pump energy;

FIG. 3 is a graph of the emission spectral energy and the line full width at half maximum of the sample 1 as a function of the pump energy;

FIG. 4 shows multiple single-pulse emission spectra of sample 1 at the same location with a pump energy of 595 μ J;

FIG. 5 is a graph of the spacing between adjacent patterns corresponding to the marker spikes of FIG. 4;

FIG. 6 is a graph of the emission spectrum of sample 2 as a function of pump energy;

FIG. 7 is a graph of the emission spectrum of sample 3 as a function of pump energy;

FIG. 8 is a graph of the emission spectral energy and the line full width at half maximum of sample 2 as a function of pump energy;

FIG. 9 is a graph of the emission spectral energy and the line full width at half maximum of the sample 3 as a function of pump energy;

FIG. 10 is a graph of the emission spectrum of sample 3 at position2 as a function of pump energy;

FIG. 11 is a graph of the emission spectrum of sample 3 at position3 as a function of pump energy;

FIG. 12 is a graph of the emission spectrum of sample 3 at position4 as a function of pump energy;

FIG. 13 is a graph of the emission spectral energy and line full width at half maximum with pump energy for sample 3 at position 2;

FIG. 14 is a graph of the emission spectral energy and line full width at half maximum with pump energy for sample 3 at position 3;

FIG. 15 is a graph of the emission spectral energy and line full width at half maximum with pump energy for sample 3 at position 4;

FIG. 16 is a plurality of single pulse emission spectra for sample 3 at position2 with a pump energy of 260 μ J;

FIG. 17 is a comparison of the threshold of random laser emission at four different locations for sample 3;

fig. 18 is a graph showing the positions of peaks appearing in the emission spectra of sample 2 and sample 3.

Detailed Description

For a better understanding of the technical content of the present invention, a specific embodiment is provided below, and the present invention is further described with reference to the accompanying drawings.

Referring to fig. 1, the preparation process of a biological random laser sample provided by the invention comprises the following steps:

pretreatment of wings:

soaking butterfly wings in ethanol for 7-9 hours, wherein the preferred soaking time is 8 hours;

placing the soaked butterfly wing on a glass sheet, and repeatedly washing the butterfly wing for 10-30 minutes by using deionized water, wherein the preferred washing time is 20 minutes;

standing the washed butterfly wing in a dust-free environment and airing;

cutting the dried wings to obtain small wing blocks, wherein the size of each small wing block is 0.8-1.2cm, and the preferred size of each small wing block is 1 cm;

preparing a liquid crystal mixed solution:

DCM dye was dissolved in acetone to a molar volume of 10^-2The dye dispersion of (1);

the liquid crystal solution is nematic liquid crystal P0616A solution, 0.2 ml of dye dispersion is added into 1 ml of nematic liquid crystal P0616A solution, ultrasonic oscillation is adopted for 30-60 minutes to obtain mixed solution, and the ultrasonic oscillation time is preferably 40 minutes;

laser sample preparation:

fixing the wing small block between two glass substrates, wherein the glass substrates are ITO conductive glass substrates, the thickness of the ITO conductive glass substrates is 20 micrometers, and the length and the width of the ITO conductive glass substrates are both 2 centimeters;

sealing two sides of the glass substrate;

dropping the mixed solution on the two unsealed sides of the glass substrate, and permeating the mixed solution between the glass substrates by utilizing the capillary phenomenon;

and standing for 20-40 minutes to obtain a laser sample.

Compared with the traditional semiconductor powder random laser and other biological random lasers, the biological random laser prepared and obtained by the invention has a more stable laser emission mode, has very important guiding significance for the practical application of the random laser in the future, and verifies the effect of the butterfly wing random laser on improving the stability of the laser emission mode through corresponding experiments.

First, 3 samples were prepared:

sample 1(PM 597/Wing): a capillary glass tube sample doped with butterfly powder and dye PM 597;

sample 2 (DCM/LC): capillary glass tube samples doped with DCM and nematic liquid crystal;

sample 3 (DCM/LC/Wing): dye DCM with a substrate of a massive butterfly wing is doped with nematic liquid crystal samples;

sample 3 was prepared by the inventive process, and before sample 1 and sample 2 were prepared, Pyrromethene-597(PM597) was selected as the gain medium, and PM597 dye was dissolved in ethanol to make up a molar volume of 10^-3 Sample 1, a dye dispersionAnd sample 2 was prepared using a capillary glass tube 50mm in length and 5mm in diameter by first doping butterfly powder into 1 ml of an ethanol dispersion of the dye PM597 and stirring uniformly to prepare a PM597/Wing solution, then adding 0.2 ml of an acetone solution containing DCM to 1 ml of nematic liquid crystal P0616A to obtain a DCM/LC solution, and after shaking the PM597/Wing solution and the DCM/LC solution using ultrasonic waves for 40 minutes, pouring the solutions into the capillary glass tube to prepare sample 1 and sample 2, respectively.

FIG. 2 is a graph of the emission spectrum of sample 1 as a function of pump energy, from which it can be seen that when the pump energy is 123, sample 1 emits only a spontaneous emission spectrum with a width at half maximum of about 25nm, and the gain of the system may not yet compensate for the loss, and as the pump energy increases to 161, a narrower peak with a width at half maximum of about 1.5nm appears in the emission spectrum of the sample; continuing to increase the pump energy to 244, a sudden narrower peak appears, corresponding to a half-width of about 0.33 nm; the appearance of the peaks in the emission spectrum in fig. 2 illustrates that some random coherent equivalent cavities are formed in the sample and that the gain in the cavities is greater than the loss, providing the feedback needed for random laser emission, which is related to microcavity localization in butterfly wing microstructures and scattering at the microstructure edges, because the microstructures are not completely periodic, plus the fluctuations of the pump pulses, so that the peak positions of the emission spectrum of sample 1 at different energies are slightly shifted.

Fig. 3 is a graph of the energy of the emission spectrum of sample 1 as a function of the pump energy, where a distinct threshold behavior can be found, the threshold being about 133, which again confirms the behavior of sample 1 emitting random laser light, as can be seen from the peak positions marked by the arrows in fig. 2, as the pump energy increases, the position of the peak in the emission spectrum of sample 1 emitting random laser light does not vary much 1, which means that the random laser equivalent cavity in the butterfly wing is relatively stable, to prove this hypothesis, the pump position of sample 1 is fixed, a plurality of single-pulse emission spectra of sample 1 are recorded at a pump energy of 595, the interval recording time of two adjacent single-pulse emission spectra is 3 minutes, where we have recorded 6 spectra, as shown in fig. 4, the positions of the peaks in the single-pulse emission spectra recorded at different times are substantially constant, in particular the main peaks are substantially fixed around 572.08 ± 0.06nm and 573.12 ± 0.08nm, the position of five peaks is marked with arrows in fig. 4, and then the mode spacing of two adjacent peaks is plotted in fig. 5, from which it can be seen that the mode spacing is also very stable, the four spacing values are 1.08, 0.98, 1.02 and 1.07nm, respectively, and the stability of the peak position and adjacent peak spacing of the emission spectrum of sample 1 is related to the limitations of the microstructure in butterfly wings.

In order to further determine the control of the butterfly wing on the random laser emission mode, the emission spectra of the sample 2 and the sample 3 are compared, fig. 6 and 7 are the random emission spectra of the sample 2 and the sample 3 under different pump energies, respectively, and it can be found from fig. 6 that when the pump energy is 27.9, the emission spectrum of the sample 2 is a smooth spontaneous emission spectrum; when the pump energy was increased to 49.5, the full width at half maximum of the emission spectrum narrowed to about 8 nm; when the pump energy is increased to 69.9, a plurality of peaks with a full width at half maximum of about 0.3nm begin to appear in the emission spectrum, and the positions of the plurality of peaks under different pump energies are random and unstable, which is related to multiple scattering of light caused by liquid crystal molecules, and different scattering paths correspond to different emission modes, and the sample 3 in fig. 7 also shows a random lasing phenomenon similar to that in fig. 6: when the pumping energy is low, the sample 3 only emits a spontaneous emission spectrum; as the pump energy increased to 168, a spike in the emission spectrum started to appear with a full width at half maximum of about 0.65 nm; continuing to increase the pump energy, the line full width at half maximum continues to narrow, a peak at half maximum of about 0.3nm appears in the emission spectrum, fig. 8 and 8 are the intensity and full width at half maximum of the emission spectra of samples 2 and 3 at different pump energies, respectively, and a significant threshold behavior appears in both fig. 8 and 9, which further determines the random lasing behavior in the samples, with the threshold magnitudes of samples 2 and 3 being 49.5 and 161.3, respectively, as can be seen by comparing fig. 6 and 7, because of the presence of the microstructure of the butterfly wing, the number of peaks in the emission spectrum of sample 3 is significantly less than the number of peaks in the corresponding spectrum of sample 2.

Referring to fig. 7, 10-12, the present invention detects the emission spectra of the same sample 3 at four different positions, similar to the emission spectra in fig. 7, where the pumping energy is low, the full width at half maximum of the emission spectra in fig. 10, 11 and 12 is wide, and no random laser light appears; when the pump energy increases to a certain value, the emission spectra show spikes, which are also indicative of the occurrence of random lasing behavior, fig. 13, 14, 15 correspond to the intensity and the full width at half maximum of the emission spectra in fig. 10, 11 and 12, from which it is found that in fig. 13, 14, 15, distinct threshold behaviors are shown, corresponding to thresholds of 61.3, 33.9 and 80.3, respectively, and most importantly, the number of spikes of the emission spectra in fig. 10, 11 and 12 is much reduced compared to fig. 6, which again determines the effect of the microstructure of the butterfly wing on the regulation of the number of random lasing modes, indicating that the microstructure of the butterfly wing enhances the locality of the random cavity, and that the local modes dominate the random lasing emission compared to the other modes.

In the comparison of fig. 2 and 5, the effect of the butterfly wing structure on the improvement of the stability of the random laser emission pattern has been determined, and it can be seen from the emission spectra in fig. 7, 10-12 and 6 that the additional effect of the butterfly wing structure on the regulation of the stability of the random laser emission pattern is that, compared to fig. 6, the peak Position of the emission spectrum of the sample 3 in fig. 7, 10-12 does not vary much with the pump energy, is substantially stable, the peak stability on the emission spectrum of the sample 3 is related to the microstructure of the butterfly wing on the one hand and the uniform distribution of liquid crystal molecules on the butterfly wing on the other hand, in order to further determine the effect of the butterfly wing, fig. 16 shows a plurality of single-pulse emission spectra of the sample 3 at a Position2 with a pump energy of 260, where the recording interval is recorded once in 3 minutes, and a total of 7 spectra are recorded, it can be seen that the main peak positions in the single-pulse emission spectra recorded at different times in fig. 16 are substantially constant, which again confirms that the butterfly wings have the effect of regulating the stability of the random laser pattern.

FIG. 17 shows the threshold values of random laser emission at four different positions of sample 3, from which it can be seen that the threshold values of random laser emission at different positions of sample 3 (161.3, 61.3, 33.9 and 80.3) are different and are smaller than the threshold value of random laser emission at sample 2 (49.5), the threshold value variation of random laser emission at different positions of sample 3 is related to the variation of butterfly wing microstructure, FIG. 18 shows the distribution of peak positions in the emission spectra of sample 2 and sample 3, in which Positon1, Positon2, Positon3 and Positon4 represent four different random positions of the same sample 3, the data of FIG. 18 are obtained from FIG. 6 and FIG. 7, and from FIG. 10, 10 and 11 corresponding peak positions in the emission spectra, and as the results obtained in most experiments, sample 2 emits conventional random laser emission spectra with many unpredictable random patterns, the peak positions are distributed in the wavelength range of 616.5-636.1 nm, although the curve in the graph is a continuous straight line, actually the peak positions are a plurality of isolated and compact points, but because the peaks in fig. 6 are too many, the peaks are replaced by an approximate straight line, however, the number of peaks in the random laser spectrum emitted by four random different positions of the sample 3 is obviously reduced, and moreover, the peak position fluctuation of the emission spectrum of the different positions of the sample 3 is not very large, and the maximum fluctuation is about 2.23nm between the main peak position of 617.05nm corresponding to the Positon1 of the sample 3 and the main peak position of 619.28nm corresponding to the Positon 2; the other positions where the peaks appear in the emission spectra of the four different positions are all concentrated at about 609.851.0nm and 615.021.2nm, and the phenomenon shows that the butterfly wing structure reduces the number of emission modes of random laser on one hand and ensures the stability of the emission modes on the other hand.

The effect of the butterfly wing structure on improving the stability of the random laser emission mode is proved by the experimental data and the curve.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.