CN107446380B

CN107446380B - Two azo dye doped organic-inorganic composite materials, and preparation method and application thereof

Info

Publication number: CN107446380B
Application number: CN201710678362.XA
Authority: CN
Inventors: 高恬溪; 张春红; 胡笑钏; 张赞
Original assignee: Changan University
Current assignee: Changan University
Priority date: 2017-08-07
Filing date: 2017-08-07
Publication date: 2023-07-28
Anticipated expiration: 2037-08-07
Also published as: CN107446380A

Abstract

The invention relates to an organic-inorganic composite material doped with two azo dyes, a preparation method and application thereof, wherein gamma- (2, 3-glycidoxy) propyl trimethoxy silane, ethanol and water are mixed, and then an acid catalyst is added to obtain a solution A; uniformly mixing tetrabutyl titanate and acetylacetone to obtain a solution B; uniformly mixing the solution A and the solution B to obtain an organic-inorganic composite matrix mother solution; adding 4-hydroxyazobenzene and disperse red 1 into the organic-inorganic composite matrix mother solution, and uniformly stirring to obtain a suspension; and depositing the suspension on a glass slide by using a spin coating process to form a film, and performing heat treatment on the film to obtain the two azo dye doped organic-inorganic composite materials. The invention adopts an improved sol-gel technology and combines a spin coating technology to dope two azo dyes together, and the prepared material has the function of simultaneously processing double-input optical signals under the excitation of two pumping light with different wavelengths.

Description

Two azo dye doped organic-inorganic composite materials, and preparation method and application thereof

Technical Field

The invention belongs to the field of optical materials, and particularly relates to an organic-inorganic composite material doped with two azo dyes, a preparation method and application thereof.

Background

Optical computing has been expected by the computer sciences community to have photons with much more bandwidth than electrons, and therefore can process more data faster, and materials and devices with all-optical signal processing capabilities become hot spots of investigation. In the related research in the past, optical memory is mostly only used for single-wavelength input signals, and few simultaneous detection and processing of optical signals with different wavelengths are involved, which reduces efficiency and increases loss in multi-signal processing. One of the ideas for solving the problem is to dope a plurality of specific various optical functional dyes in the material preparation process, and adjust the wavelength positions of a plurality of characteristic peaks by adjusting specific preparation parameters of the material, so that the requirement of multi-signal processing is met.

In recent years, organic-inorganic composite materials based on organic modified silicate are researched and proved to have great value in the field of integrated optical application, which mainly results from the addition of a doping organic molecule functional group, so that integrated optical devices with all-optical signal processing function are possible, and organic molecules in an organic-inorganic composite structure can fill holes in an inorganic oxide chain, so that the material is more compact. Therefore, the application of the composite material based on the organic modified silicate in the aspect of integrated photonics attracts great attention of scientists internationally, and by using the related technology, a compact, low-loss and several-micrometer-thick single-layer high-optical-quality film can be obtained at low temperature (even close to room temperature), and the prepared photonic device can be directly integrated with a semiconductor light source, a detector and various optical functional devices.

However, in the prior art, optical signals with different wavelengths are processed by different materials, mainly, a plurality of materials are combined together by device preparation, and the optical signals are combined in a physical layer, and if the combination mode is close fit, optical transmission loss can be generated at an interface; if combined separately, the device size may be increased.

Disclosure of Invention

The invention aims to overcome the problems in the prior art, and provides two azo dye doped organic-inorganic composite materials, a preparation method and application thereof, and double-signal optical memory is realized by preparing the two azo dye doped organic-inorganic composite materials.

In order to achieve the above purpose, the invention adopts the following technical scheme:

the method comprises the following steps:

(1) Mixing gamma- (2, 3-epoxypropoxy) propyl trimethoxy silane, ethanol and water, and adding an acidic catalyst to obtain a solution A, wherein the molar ratio of the gamma- (2, 3-epoxypropoxy) propyl trimethoxy silane to the ethanol is 1:4, a step of; the molar ratio is 1:4, uniformly mixing tetrabutyl titanate and acetylacetone to obtain a solution B;

(2) The molar ratio of gamma- (2, 3 glycidoxy) propyl trimethoxy silane to tetrabutyl titanate is (70-90): (30-10), uniformly mixing the solution A and the solution B to obtain an organic-inorganic composite matrix mother solution;

(3) Adding 4-hydroxyazobenzene and disperse red 1 which are all accounting for 0.5-3% of the weight of the organic-inorganic composite matrix mother liquor into the organic-inorganic composite matrix mother liquor, and uniformly stirring to obtain suspension;

(4) And depositing the suspension on a glass slide by using a spin coating process to form a film, and performing heat treatment on the film to obtain the two azo dye doped organic-inorganic composite materials.

Further, in the step (1), the molar ratio of ethanol to water is 1:1.

further, the acid catalyst in the step (1) is hydrochloric acid with a mass concentration of 37%; hydrochloric acid is added to make the pH value of the obtained solution A be 3.1-4.3.

Further, the rotating speed in the rotary coating process in the step (4) is 2500-3500 rpm.

Further, the heat treatment in the step (4) is performed at 80 to 120℃for 10 to 13 minutes.

Two azo dye doped organic-inorganic composite materials prepared by the preparation method are provided.

Use of two azo dye doped organic-inorganic composite materials as described above for simultaneous processing of dual input optical signals.

Further, the method comprises the following processing steps:

(1) A polarizer, an attenuation sheet, a spectroscope and a reflecting mirror are sequentially arranged at the rear sides of the output ends of the two pump lasers with fixed wavelengths respectively to form a first pump light path and a second pump light path; a polarizer is arranged at the rear side of the output end of the detection laser with continuously adjustable wavelength to form a detection light path; the laser beams of the first pumping light path, the second pumping light path and the detection light path are finally converged at a point, two azo dye doped organic-inorganic composite materials are placed at the point, and optical filters are arranged at the rear sides of the two azo dye doped organic-inorganic composite materials; the spectroscope comprises a reflection light path and a transmission light path connected with the reflector, and the reflection light path and the optical filter of the spectroscope are connected with the detector to finish overlapping of the light paths;

(2) The laser emitted by the two pump lasers is shielded in sequence and used for simulating the change of an input optical signal, and the signal change conditions of the two pump lights and the one detection light are detected through the three detectors respectively.

Further, the wavelengths of the laser light emitted by the two pump lasers are respectively located in two characteristic absorption peaks of the two azo dye doped organic-inorganic composite materials.

Further, the wavelengths of the two pump lasers are respectively 532nm and 355nm; the wavelength adjustable range of the detection laser is 430 nm-2300 nm.

Compared with the prior art, the invention has the following beneficial technical effects:

the method adopts an improved sol-gel technology and combines a spin coating technology to prepare, two azo dyes are doped together, the effects of the dyes are not independent of each other, the influence on the optical function characteristics of the material becomes a whole, the purpose of simultaneously processing lasers with different wavelengths can be realized by doping the two dyes, and the method has the advantages of low synthesis temperature, simple process requirement, good repeatability and the like.

The material is a low-temperature organic-inorganic composite film material taking titanium dioxide and organic modified silicate as matrixes, and has the optical function characteristic by doping two different azo dye micromolecular functional groups, so that the prepared material has the advantages of good flexibility and mechanical characteristic, and the prepared device is easy to process, grind and polish, and the prepared film material has the function of simultaneously processing double-input optical signals under the excitation of two bundles of pumping light with different wavelengths. In addition, the invention is based on a single-layer optical quality waveguide film with thickness of a few micrometers and adjustable refractive index at low temperature, so that the integration of a photon device is facilitated, and is an important trend of development of photonics.

The low-temperature organic-inorganic composite material is a low-temperature organic-inorganic composite photon information material for all-optical signal processing, and can be used in the fields of optical signal detection, calculation, memory and the like.

Furthermore, the invention adopts pump lasers with wavelengths of 532nm and 355nm respectively, is classical, common and has wide application range, so that the optical path of the invention can be used for testing thin films, liquid and solid materials with the following two characteristic conditions: 1. the double absorption peak is around 350nm and 500 nm; 2. in the case of simultaneous irradiation of the above-mentioned two wavelength lasers, there is a wavelength position in the absorption spectrum where the absorption intensity remains unchanged.

Drawings

FIG. 1 is an absorption spectrum of a titanium dioxide-organically modified silicate film material containing disperse red 1 dye and 4-hydroxyazobenzene dye small molecules, each having a doping specific gravity of 1%.

FIG. 2 shows the absorption spectrum of a titanium dioxide-organically modified silicate film material containing disperse red 1 dye and 4-hydroxyazobenzene dye small molecules, which has a doping density of 1%, with time when irradiated by a mercury lamp light source with a wavelength of 504 nm.

FIG. 3 shows the absorption spectrum of a titanium dioxide-organically modified silicate film material containing disperse red 1 dye and 4-hydroxyazobenzene dye small molecules, which has a doping density of 1%, with time when irradiated by a 355nm wavelength mercury lamp light source.

FIG. 4 shows the absorption spectrum of a titanium dioxide-organically modified silicate film material containing dispersed red 1 dye and 4-hydroxyazobenzene dye small molecules, both of which have a doping density of 1%, under the irradiation of a mercury lamp light source with wavelengths of 504nm and 355nm, with time.

FIG. 5 is a diagram of an optical path device for characterizing the dual signal optical memory properties of a thin film material. The wavelengths of the pumping light used as input signals of the two beams are 532nm and 355nm respectively, the wavelength of the detection light is 470nm, and the lasers are all continuous lasers. Wherein P is a polarizer; NA is the attenuation piece; BS is a spectroscope; m is a reflector; d is a detector; f is an optical filter.

Fig. 6 shows an optical function test of a thin film material doped with two dyes by using the optical path device shown in fig. 5, wherein the input optical signal is changed by manually shielding two laser beams sequentially, and the shielding time is about 3s, 5s and 60s sequentially.

Detailed Description

The invention is described in further detail below with reference to the accompanying drawings.

The preparation method of the material comprises the following steps:

1) Firstly, mixing 1 mole of gamma- (2, 3-glycidoxy) propyl trimethoxy silane, 4 moles of ethanol and 4 moles of deionized water, and then adding hydrochloric acid as a catalyst to make the solution acidic, wherein the pH value is 3.1-4.3, and the mass concentration of the hydrochloric acid is 37%; continuously stirring uniformly to obtain a solution A; 1 mol of tetrabutyl titanate and 4 mol of acetylacetone are mixed and stirred continuously to be uniform to obtain a solution B.

In the invention, the pH value can influence the position of the absorption peak of the material, the smaller the pH value is, the whole blue shift of the absorption peak of the material is, and on the contrary, the larger the pH value is, the whole red shift of the absorption peak of the material is. This detail is essential to the characteristics of the present invention in that the wavelength of the probe light needs to be readjusted after the entire shift of the absorption peak, which is also why the probe light needs to be a wavelength-continuously tunable laser.

2) The molar ratio of gamma- (2, 3 glycidoxy) propyl trimethoxy silane to tetrabutyl titanate is (70-90): (30-10), mixing the solution A and the solution B, and continuously stirring the mixed solution at room temperature to obtain a low-temperature organic-inorganic composite matrix mother solution containing uniform silicon and titanium;

3) Adding two azo dyes into the organic-inorganic composite matrix mother liquor, wherein the azo dyes are respectively 4-hydroxyazobenzene accounting for 0.5-3% of the weight of the organic-inorganic composite matrix mother liquor and dispersed red 1 micromolecules accounting for 0.5-3% of the weight of the matrix, and stirring uniformly at room temperature to obtain a suspension;

4) And (3) depositing the obtained suspension on a glass slide by utilizing a spin coating process at the rotating speed of 2500-3500 revolutions per minute, and then treating the deposited film sample at the temperature of 80-120 ℃ for 10-13 minutes to obtain the double-dye-doped titanium dioxide-organic modified silicate-based organic-inorganic composite optical waveguide film material with a single layer, smooth and flat surface and high optical quality.

Example 1

1) Firstly, mixing 1 mole of gamma- (2, 3-glycidoxy) propyl trimethoxy silane, 4 moles of ethanol and 4 moles of deionized water, then adding hydrochloric acid as a catalyst to make the solution acidic, and continuously stirring uniformly to obtain a solution A, wherein the pH value is 3.5; 1 mol of tetrabutyl titanate and 4 mol of acetylacetone are mixed and stirred continuously to be uniform to obtain a solution B.

2) Then the molar ratio of gamma- (2, 3 glycidoxy) propyl trimethoxy silane to tetrabutyl titanate is 80:20, mixing the solution A and the solution B, and continuously stirring the mixed solution at room temperature to obtain a low-temperature organic-inorganic composite matrix mother solution containing uniform silicon and titanium;

3) Adding two azo dyes into the organic-inorganic composite matrix mother solution, wherein the azo dyes are respectively 4-hydroxyazobenzene accounting for 1% of the weight of the matrix and disperse red 1 micromolecules accounting for 1% of the weight of the matrix, and stirring uniformly at room temperature to obtain a suspension;

4) And (3) depositing the obtained suspension on a glass slide at a rotating speed of 3000 rpm by utilizing a rotary coating process, and then treating a deposited film sample at 80 ℃ for 12 minutes to obtain the titanium dioxide-organic modified silicate-based organic-inorganic composite optical waveguide film material with a single layer, smooth and flat surface and high optical quality and double-dye doping.

FIG. 1 is an absorption spectrum of example 1. As can be seen from the graph, the film doped with two different azo dyes has two obvious characteristic absorption peaks near 334nm and 500nm respectively, and simultaneously has an absorption valley near 410nm and positioned between the two absorption peaks, so that the two absorption peaks have obvious intervals. As can be seen from the results of fig. 1, the two absorption peaks are the results of dispersing the cis-isomer and trans-isomer in the red 1-and 4-hydroxyazobenzene-small molecules, and since the cis-trans structure isomerization process of the two dye molecules is rapid and reversible, the thin film material doped with the two dyes is sensitive to light sources with wavelengths around 334nm and 500 nm.

FIG. 2 shows the absorption spectrum of example 1 with time when irradiated with a light source having a wavelength of 504nm, which is a mercury lamp using a filter. As can be seen from the graph, as the illumination time increases, both characteristic peak intensities of the film decrease, the intensity of the absorption valleys does not change, and no significant blue or red shift occurs between the peak and valley positions.

FIG. 3 shows the absorption spectrum of example 1 with time when irradiated with a 355nm wavelength light source, which is a mercury lamp using a filter. As can be seen from the graph, unlike fig. 2, as the illumination time increases, the absorption peak intensity at around 334nm decreases, the absorption peak at around 500nm hardly changes, the absorption valley intensity at around 410nm increases, and the position of the absorption valley is significantly blue-shifted.

FIG. 4 shows the absorption spectrum of example 1 under the irradiation of light sources having wavelengths of 504nm and 355nm, the light source being a mercury lamp using a filter. As can be seen from the graph, as the illumination time increases, the intensity of the absorption peak near 334nm is significantly reduced, and the intensity of the absorption peak near 500nm is not significantly changed, but the position thereof is significantly blue-shifted, and at the same time, the intensity of the absorption valley near 410nm is increased, and the position thereof is also blue-shifted. It should be noted that, although the absorption peaks and the absorption valleys of the film sample are differently changed in the case of simultaneous irradiation with the dual light sources, the absorption intensities at the two wavelength positions remain unchanged, respectively in the vicinity of 400nm and 470nm, so that a continuous laser with a wavelength tunable in the vicinity of 470nm is selected as the detection light source.

The invention utilizes the improved sol-gel technology and spin coating technology to obtain the optical functional film with a plurality of characteristic absorption peaks by doping two different azo optical functional dyes. Under the respective irradiation of light sources with wavelengths of 355nm and 504nm, the intensity of two characteristic absorption peaks in an ultraviolet-visible light absorption spectrum of the film can be changed to different degrees; under the simultaneous irradiation of the two light sources of the two lasers, the change trend of the two characteristic absorption peaks of the film material is different from that of the film material irradiated by the single light source, and it is notable that in the case, a fixed wavelength position is arranged near 470nm in the absorption spectrum of the film, and the absorption intensity is unchanged under the simultaneous irradiation of the two light sources; when any one of the light sources is removed, the absorption intensity changes at the wavelength position where the original absorption intensity is unchanged.

In order to characterize the prepared film sample based on the dual-signal optical memory characteristic, an optical path device based on a pumping detection principle is built by utilizing the characteristic, and 355nm and 532nm wavelength lasers are set as pumping light to be two input optical signals; a laser light of 470nm wavelength is set as the probe light, and an optical signal is output. The preparation and the construction of the optical path of the material are a method for realizing the optical memory of double signals, and can finish the function of simultaneously detecting and memorizing two optical signals with different wavelengths.

FIG. 5 is a diagram of an optical path device for characterizing the dual signal optical memory properties of a thin film material. The two pumping light beams used as different input signals have different wavelengths of 532nm and 355nm respectively, the detection light is used for displaying the result of the sample after the two pumping light beams are subjected to signal processing, the output wavelength is 470nm, the two pumping light beams are emitted by lasers, the lasers are all continuous lasers, and the continuous wavelength range which can be emitted by the detection light lasers is 430-2300 nm. The two beams of pumping light are polarized and then converged on the sample, and under the action of illumination, the dispersed red 1 small molecules and the 4-hydroxyazobenzene small molecules in the film sample are subjected to photoinduced cis-trans structural isomerization, so that the absorption intensity of the film sample at each wavelength position is changed. The effect of the detection light is to detect the irradiation condition of two beams of pump light, and as can be seen in combination with fig. 2,3 and 4, when two beams of light sources act on the sample at the same time, the absorption rate of the sample near 470nm is kept unchanged; when the 355nm light source is removed and only 532nm light is reserved, the absorption rate of the sample near 470nm is reduced; conversely, when the 532nm light source is removed and only 355nm light is retained, the absorbance of the sample near 470nm increases.

The optical path of the invention can be used for testing thin films, liquids and solid materials with absorption peaks near 350nm and 500nm and similar wavelength positions not affected by illumination of two pump lights applied in the optical path; the position is set to the detection light wavelength, and the laser light used for the detection light is not fixed but adjustable in wavelength.

The invention realizes the whole output of the optical path of the double-signal optical memory method based on the two azo dye doped organic-inorganic composite materials as the change of the detection light intensity passing through the sample, and the basic principle is that when two beams of pumping light act on the sample, the output detection light intensity is unchanged, and when any beam of pumping light is blocked, namely the input optical signal changes, the output detection light intensity can be fluctuated.

Fig. 6 shows an optical function test performed on the thin film manufactured in embodiment 1 by using the optical path device shown in fig. 5, wherein the input optical signal is changed in such a way that two laser beams are manually blocked, and the blocking time period is about 3s, 5s, and 60s in sequence. As can be seen from the figure, when two laser beams are simultaneously applied to the sample, the light intensity of the probe light output is unchanged; when a 355nm light source is shielded manually and 532nm light is reserved, the light intensity of the detected light output is reduced, and the longer the light source is shielded, the more obvious the continuous reduction of the output light intensity is; conversely, if the 532nm light source is blocked manually, and 355nm light is retained, the light intensity of the detection light output will rise, and similarly, the longer the light source is blocked, the more obvious the output light intensity continuously drops. When the blocked light signal is recovered, the output light signal is basically recovered to the initial state of double-light source irradiation. The test results as above agree with the conclusions drawn by the analysis in connection with fig. 1, 2 and 3. The test can detect and memorize the dual input optical signal through the output detection light result.

Example 2

1) Firstly, mixing 1 mole of gamma- (2, 3-glycidoxy) propyl trimethoxy silane, 4 moles of ethanol and 4 moles of deionized water, then adding hydrochloric acid as a catalyst to make the solution acidic, and continuously stirring uniformly to obtain a solution A, wherein the pH value is 3.1; 1 mol of tetrabutyl titanate and 4 mol of acetylacetone are mixed and stirred continuously to be uniform to obtain a solution B.

2) Then the molar ratio of gamma- (2, 3 glycidoxy) propyl trimethoxy silane to tetrabutyl titanate is 70:30, mixing the solution A and the solution B, and continuously stirring the mixed solution at room temperature to obtain a low-temperature organic-inorganic composite matrix mother solution containing uniform silicon and titanium;

3) Adding two azo dyes into the organic-inorganic composite matrix mother solution, wherein the azo dyes are respectively 4-hydroxyazobenzene accounting for 0.5 percent of the weight of the matrix and dispersed red 1 small molecules accounting for 0.5 percent of the weight of the matrix, and stirring uniformly at room temperature to obtain suspension;

4) And (3) depositing the obtained suspension on a glass slide by using a spin coating process at the rotating speed of 2500 rpm, and then treating the deposited film sample at the temperature of 100 ℃ for 13 minutes to obtain the titanium dioxide-organic modified silicate-based organic-inorganic composite optical waveguide film material with single layer, smooth and flat surface and high optical quality and double-dye doping.

Example 3

1) Firstly, mixing 1 mole of gamma- (2, 3-glycidoxy) propyl trimethoxy silane, 4 moles of ethanol and 4 moles of deionized water, then adding hydrochloric acid as a catalyst to make the solution acidic, and continuously stirring uniformly to obtain a solution A, wherein the pH value is 4.3; 1 mol of tetrabutyl titanate and 4 mol of acetylacetone are mixed and stirred continuously to be uniform to obtain a solution B.

2) Then the molar ratio of gamma- (2, 3 glycidoxy) propyl trimethoxy silane to tetrabutyl titanate is 90:10, mixing the solution A and the solution B, and continuously stirring the mixed solution at room temperature to obtain a low-temperature organic-inorganic composite matrix mother solution containing uniform silicon and titanium;

3) Adding two azo dyes into the organic-inorganic composite matrix mother solution, wherein the azo dyes are respectively 4-hydroxyazobenzene accounting for 3% of the weight of the matrix and disperse red 1 micromolecules accounting for 3% of the weight of the matrix, and stirring uniformly at room temperature to obtain a suspension;

4) And (3) depositing the obtained suspension on a glass slide by utilizing a spin coating process at the rotating speed of 3500 revolutions per minute, and then treating the deposited film sample at the temperature of 120 ℃ for 10 minutes to obtain the titanium dioxide-organic modified silicate-based organic-inorganic composite optical waveguide film material with single layer, smooth and flat surface and high optical quality and double dye doping.

In summary, the titanium dioxide-organic modified silicate film doped with two dyes of disperse red 1 and 4-hydroxyazobenzene small molecules can be prepared by combining a sol-gel method with a spin coating method, and the light sensitivity characteristics near two characteristic absorption peaks of the titanium dioxide-organic modified silicate film are tested by utilizing a mercury lamp with an optical filter, so that the condition that the absorption light intensity of each absorption peak and each absorption valley of a film sample is changed under the condition of single light source and double light source irradiation is obtained, and the wavelength position with unchanged absorption rate under the condition of double light source irradiation is determined to be near 470 nm. By using the optical path device constructed by using fig. 5, 355nm and 532nm near two absorption peaks of the film are set as pump light, namely, dual-input optical signals, 470nm with unchanged absorption rate under the condition of dual-light source irradiation is set as detection light, and the purpose of detecting two pump light signals simultaneously can be achieved by testing the detection light signals passing through the sample. Specifically, when both input optical signals are 1, the output optical signal is kept 0 unchanged; when the 355nm optical signal is "0" and the 532nm optical signal is "1", the output optical signal is "-1"; when the 355nm optical signal is "1", the 532nm optical signal is "0", the output optical signal is "1". The detection and memory of the two light signals with different wavelengths can be completed simultaneously by combining the double-dye doped film sample with the light path device provided by the figure 5. Possible application scenario descriptions: the invention can be applied to the single cell research field of an all-optical neural network, wherein a film sample is one cell in the neural network, two input optical signals with different wavelengths are used for simulating two different external stimuli, such as two objects seen by a simulated visual cell, when the states of the two objects are not changed, the output signals processed by the cell are kept unchanged, and when the state of any one object is changed, the output optical signals are detected and recorded to be changed correspondingly. Compared with single-signal optical memory, the dual-signal simultaneous detection and processing function has obvious advantages, can effectively improve efficiency, reduces loss and has application value. It should be noted that the above application scenario is only for example, and is not limited thereto, and thus described.

Claims

1. The preparation method of the two azo dye doped organic-inorganic composite materials is characterized by comprising the following steps: the method comprises the following steps:

(4) Depositing the suspension on a glass slide by using a spin coating process to form a film, and performing heat treatment on the film to obtain two azo dye doped organic-inorganic composite materials;

the mole ratio of ethanol to water in the step (1) is 1:1, a step of;

the acid catalyst in the step (1) is hydrochloric acid with the mass concentration of 37%; and adding hydrochloric acid to enable the pH value of the obtained solution A to be 3.1-4.3.

2. The method for preparing two azo dye doped organic-inorganic composite materials according to claim 1, wherein: the rotating speed in the rotary coating process of the step (4) is 2500-3500 rpm.

3. The method for preparing two azo dye doped organic-inorganic composite materials according to claim 1, wherein: the heat treatment in the step (4) is carried out at 80-120 ℃ for 10-13 minutes.

4. Two azo dye doped organic-inorganic composite materials prepared by the preparation method of claim 1.

5. Use of two azo dye doped organic-inorganic composite materials according to claim 4 for simultaneous processing of dual input optical signals.

6. Use of two azo dye doped organic-inorganic composite materials according to claim 4 for simultaneous processing of dual input optical signals, characterized in that: the method comprises the following processing steps:

7. Use of two azo dye doped organic-inorganic composite materials according to claim 6 for simultaneous processing of dual input optical signals, characterized in that: the wavelengths of the laser light emitted by the two pump lasers are respectively positioned in two characteristic absorption peaks of the organic-inorganic composite material doped with the two azo dyes.

8. Use of two azo dye doped organic-inorganic composite materials according to claim 6 for simultaneous processing of dual input optical signals, characterized in that: the wavelengths of the two pump lasers are respectively 532nm and 355nm; the wavelength adjustable range of the detection laser is 430 nm-2300 nm.