Method based on light-induced regulation of optical absorption of materials and application thereof

Abstract

The application discloses a method based on light-induced regulation material optical absorption and application thereof, and belongs to the optical technical field, and specifically comprises the following steps: selecting a suitable excitation light source according to different materials to induce blackbody absorption phenomenon or using high-power density excitation light to induce the material to generate light-induced blackbody absorption phenomenon; selecting a suitable excitation light source according to the material to induce blackbody absorption phenomenon, which needs to ensure that the laser wavelength is matched with the characteristic absorption wavelength of the material, so that the light-induced blackbody absorption phenomenon can be generated; and using high-power density excitation light to induce the material to generate light-induced blackbody absorption phenomenon, which needs to ensure that the material used can produce not less than 0.1% light absorption to the excitation light. The method causes the material to generate light-induced blackbody absorption by laser irradiation, so that the optical absorption of the material is sharply increased in a wide wave band (200nm-2500nm).

Description

Technical Field

[0001] This invention belongs to the field of optical technology, specifically relating to a method for optical absorption based on photoinduced modulation of materials and its application. Background Technology

[0002] Utilizing the high power density of lasers, laser cutting machines and laser weapons have been developed. Their operating principle is as follows: a high-power-density laser beam irradiates the material, rapidly heating it to its vaporization temperature, causing it to evaporate and form a hole, thereby achieving the purpose of cutting the material and penetrating the target's armor. The key to achieving this is that the material has a high light absorption capacity for the laser. Since the wavelength of a laser is usually fixed, different wavelengths are only effective on certain specific materials (materials with high light absorption). If the laser wavelength does not match the absorption wavelength of the material, its working efficiency will be greatly reduced, or it may even fail to heat and vaporize the material at all. Summary of the Invention

[0003] To address the shortcomings of existing technologies, such as the mismatch between the wavelength of the laser and the absorption wavelength of the material, which leads to reduced working efficiency, this invention provides a method for controlling the optical absorption of materials based on light-induced modulation and its application. This method uses laser irradiation to induce light-induced blackbody absorption in the material, resulting in a dramatic increase in the optical absorption of the material over a wide wavelength range (200nm to 2500nm).

[0004] The specific details are as follows: Under intense 980nm laser irradiation, some materials emit bright white light, while simultaneously exhibiting blackbody absorption characteristics. That is, the material exhibits significant and strong absorption of electromagnetic waves across a wide wavelength range (200nm–2500nm) while emitting broadband electromagnetic waves. The sudden generation of broadband luminescence and the rapid increase in light absorption occur synchronously after a significant energy accumulation process. These characteristics are similar to photon avalanche luminescence. Reported avalanche luminescence generally satisfies the following conditions: weak E0 ground-state absorption, strong E1 excited-state absorption, and effective cross-relaxation between the two transitions from the E2 high-energy level to the E1 excited-state level and from the E0 ground-state level to the E1 excited-state level, gradually populating the E1 excited-state level. When the population of the E1 excited-state level reaches a certain level, the excited-state absorption of E1 and the cross-relaxation of E0→E1+E2→E1 increase rapidly, leading to a sharp increase in radiative transitions from the E2 high-energy level in an avalanche manner. Clearly, the enhancement of excited-state absorption and the increase in excited-state population constitute a positive feedback process, manifested as a sudden increase in luminescence. However, recent research has found that avalanche-like luminescence enhancement is accompanied by avalanche-like light absorption enhancement, exhibiting blackbody absorption characteristics. When photoinduced blackbody absorption occurs, the material used in the experiment strongly absorbs the irradiated light, regardless of its wavelength, exhibiting strong light absorption across the entire spectrum. These two characteristics precisely indicate that these broadband, strongly absorbed energy levels are newly generated quantum states, photoinduced under strong light irradiation, and possess strong light absorption characteristics across the entire spectrum. More precisely, after this novel photon avalanche optical frequency conversion, the material converts the light irradiated onto it into broadband electromagnetic radiation, the spectrum of which is very similar to blackbody radiation (or thermal radiation). Simultaneously, the material exhibits significant and strong absorption (greater than 90%) of electromagnetic waves in a wide wavelength range (200 nm–2500 nm). This phenomenon is termed photoinduced blackbody absorption.

[0005] To verify whether changes in optical absorption are related to the material's temperature, the optical absorption of the material was measured when it was heated. Experimental results showed that electric heating or flame heating had no significant effect on its optical absorption. Clearly, a high-power-density irradiation field is the fundamental factor altering the material's absorption properties. For example, a white powder sample rapidly transforms into a blackbody material with strong absorption under strong light irradiation, but reverts to its original state (like white powder) when the light is removed. Under near-infrared laser focused irradiation, the sample (typically white) emits strong broadband light radiation, with a significant and rapid increase in optical absorption in the ultraviolet, visible, and infrared spectral regions, exceeding 90%, much like a blackbody. In other words, when these samples emit strong white light, their optical absorption suddenly increases abruptly, and simultaneously, the spectral color temperature of the sample can reach over 2800℃.

[0006] Similar experiments were conducted using lasers of other wavelengths, revealing that light-induced blackbody absorption could occur as long as the laser wavelength matched the material's characteristic absorption wavelength. For example, if the material is doped with Yb... 3+ Ions, and a -980nm laser can induce blackbody absorption; if the material is doped with Er... 3+ Ions, and a laser beam at -1530nm can induce blackbody absorption; if the material is doped with Nd... 3+ For ions, a laser at -1064 nm can induce blackbody absorption; if the material is doped with CdSe quantum dots, depending on the size of the quantum dots, a laser at 400–600 nm can induce blackbody absorption, and so on.

[0007] The above findings indicate that:

[0008] 1. When light-induced blackbody absorption occurs, the material's absorption of light is no longer selective; that is, light or laser light of any wavelength will be strongly absorbed by the material. This characteristic expands the range of wavelengths available for laser cutting and laser weapons.

[0009] 2. If the initial light absorption of a material is high (usually not less than 0.1%), light-induced blackbody absorption will occur. The larger the initial light absorption coefficient, the easier it is for light-induced blackbody absorption to occur. Utilizing this characteristic, light-induced blackbody absorbing materials can be designed and fabricated for specific laser wavelengths. For example, a high-power laser A is intended to perform laser cutting or laser ablation on α material. However, if the wavelength of laser A does not match the light absorption wavelength of α material, the efficiency of laser cutting or laser ablation will be very low or even impossible. In previous work, very high-power lasers were required to achieve laser cutting or laser ablation of materials, placing high demands on laser power. These requirements could only be met under specific conditions, making laser processing or laser ablation very difficult.

[0010] 3. By utilizing the light-induced blackbody absorption effect, the above situation can be completely changed, increasing the efficiency of laser cutting or laser destruction and expanding the application range of existing lasers. The specific method is as follows:

[0011] (1) Select a laser wavelength with strong light absorption in α-materials to induce a photoinduced blackbody absorption effect on the material surface. Since different materials have different light absorption wavelengths, this method places high demands on the laser and has poor versatility. Finding a high-power laser that matches the light absorption of α-materials will cause many application inconveniences.

[0012] (2) Increase the output power of laser A to induce nonlinear absorption in the α material. This method places higher demands on the laser, and the power loss of the laser will be relatively large in application.

[0013] (3) Using a laser B that matches the light absorption wavelength of the α material, photoinduced blackbody absorption is induced on the surface of the α material, resulting in strong absorption of laser A by the α material. The advantage of this method is that it uses a relatively low-power laser B to induce strong absorption of the material by a high-power laser A, making full use of existing high-power lasers without special requirements on the output wavelength of the high-power laser. The disadvantage is that although the output power requirement of the laser is not high, it is still necessary to find another laser wavelength that matches the light absorption of the α material.

[0014] (4) Utilizing the photoinduced blackbody absorption effect, a photoinducible material is coated onto the surface of the α material, and a matching induced laser is used to generate a photoinduced blackbody absorption effect on the surface of the α material. This increases the absorption rate of the α material to laser A, further enhancing the photoinduced blackbody absorption effect and generating high temperatures above 2800℃ on the surface and inside the α material, achieving the purpose of laser cutting and laser destruction. The advantages of this method are that the wavelength of the inducing material and the inducing laser are easily matched, there are no requirements for the materials to be laser cut or laser destroyed, the method is simple, and it has a wide range of applications.

[0015] (5) Femtosecond, picosecond and nanosecond pulsed lasers have large peak power. Using them together with high-power continuous lasers will accelerate the generation of light-induced blackbody absorption.

[0016] Specifically, this invention relates to a method for controlling the optical absorption of materials based on photoinduced modulation and its application. This method utilizes a high-power laser to irradiate the material, achieving a laser power density (not less than 1 W / mm²). 2 After exceeding a certain threshold, the material emits bright white light, exhibiting obvious broadband avalanche luminescence characteristics. At this time, a new energy state is generated inside the material. It is the generation of the new energy state that gives the material a strong light absorption capability. Moreover, this new energy level with broadband strong absorption capability is a newly generated quantum state, which is light-induced under strong light irradiation. After the irradiation light is removed, the new energy state disappears rapidly.

[0017] This invention is achieved through the following technical solution:

[0018] A method for controlling the optical absorption of materials based on photoinduced modulation includes the following:

[0019] Select a suitable excitation source based on different materials to induce blackbody absorption, or utilize a high power density (not less than 1W / mm²). 2 The excitation light is used to induce the material to produce photoinduced blackbody absorption.

[0020] Specifically, to induce blackbody absorption by selecting a suitable excitation source based on the material, it is necessary to ensure that the laser wavelength matches the characteristic absorption wavelength of the material in order to achieve the generation of light-induced blackbody absorption.

[0021] When the wavelength of the working laser does not match the characteristic absorption wavelength of the material, a photoinduced blackbody absorbing material is coated on the surface of the material and irradiated with a matching induced laser, so that the surface of the material undergoes photoinduced blackbody absorption, thereby causing the material to strongly absorb the working laser.

[0022] Utilizing high power density (not less than 1W / mm) 2 To induce photoinduced blackbody absorption in materials using excitation light, it is necessary to ensure that the materials used can absorb at least 0.1% of the excitation light.

[0023] Furthermore, the selection of a suitable excitation light source based on the material is as follows:

[0024] If the material contains Yb 3+ Ions, using a ~980nm laser to induce blackbody absorption; if the material contains Er 3+ Ions, blackbody absorption induced by a laser at ~1530nm; if the material contains Nd 3+ For ions, blackbody absorption is induced by a laser at ~1064nm; if the material contains CdSe quantum dots, blackbody absorption is induced by a laser at 400-600nm, depending on the size of the quantum dots, and so on, so that the light absorption coefficient of the material is greater than 90% over a wide wavelength range.

[0025] Furthermore, the wideband is 200nm to 2500nm.

[0026] Furthermore, utilizing high power density (not less than 1W / mm²) 2 In the process of inducing photoinduced blackbody absorption by excitation light, the materials used include oxides, fluorides, MREF4, mixed nanostructures, or carbon-based materials; wherein M is Li, Na, K, or Ba; the oxides include Y2O3, La2O3, Lu2O3, Gd2O3, Yb2O3, ZrO2, and Y3Al5O3. 12 Ca 12 Al 14 O 33 Y2Si2O7, Y4Zr3O 12 YVO4, Sr2CeO4, Gd3Ga5O 12 Yb3Al5O 12 NdAlO3, PrO2, BaCuSi4O 10The fluorides include YF3, LaF3, LuF3, GaF3, and YbF3; the MREF4 includes NaYF4, LiLaF4, BaLuF4, and KGdF4; the mixed nanostructures include Ag-SiO2-Er2O3, Yb2O3 / Au, Nd2O3 / Au, and Gd2O3 / Au; and the carbon-based materials include graphene, carbon nanotubes, and monolayer graphene.

[0027] Furthermore, the method specifically includes the following steps:

[0028] Step 1: Preparation of Y2O3 material thin films;

[0029] All chemicals were of analytical grade and required no further purification before use; yttrium oxide was supplied by Shanghai Aladdin Reagent Co., Ltd.

[0030] Place 5 mmol of the above powder sample into a tablet mold with a diameter of 12 mm, press it to 8t using a BJ-15 flat tablet press, maintain the pressure for 20 seconds, release the pressure, and remove the tablet sample;

[0031] Step 2: Utilize high power density (not less than 1W / mm²) 2 The excitation light is used to induce the material to produce photoinduced blackbody absorption.

[0032] By irradiating a thin film of Y2O3 material with a high-power 980nm laser, and adjusting the excitation light power, the thin film of Y2O3 material is made to undergo photoinduced blackbody absorption, thereby generating strong optical absorption characteristics. Femtosecond, picosecond and nanosecond pulsed lasers have large peak power, and using them together with high-power continuous lasers will accelerate the generation of photoinduced blackbody absorption phenomenon.

[0033] On the other hand, the present invention provides an application of a method based on light-induced modulation of material optical absorption in laser cutting or laser destruction. Specifically, during laser cutting or laser destruction, when a light-inducing material of a specified wavelength that is easily absorbed by the material becomes a strong light-absorbing material, the high-power laser irradiated at the same time is strongly absorbed, thereby achieving the purpose of laser cutting or laser destruction of the irradiated object, and improving the efficiency of the high-power laser used in laser cutting or laser destruction.

[0034] Compared with the prior art, the advantages of the present invention are as follows:

[0035] 1. Regardless of the specific material, theoretically any material can be photoinduced to generate a new energy state, thereby causing a dramatic enhancement of light absorption and becoming an excellent light-absorbing material with significant absorption of electromagnetic waves in a wide wavelength range (200nm~2500nm).

[0036] 2. It does not depend on the wavelength of the excitation light. Theoretically, light of any wavelength can be used as excitation light to photo-induce light into the material, thereby turning the material into a light-absorbing material.

[0037] 3. The optical absorption enhancement caused by photo-induced absorption is a wide-band (200nm~2500nm) enhancement. The photo-induced material has significant absorption of electromagnetic waves in a wide band (200nm~2500nm), and the absorption range is much larger than that of previous light-absorbing materials. Attached Figure Description

[0038] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the accompanying drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. In all the drawings, similar elements or parts are generally identified by similar reference numerals. In the drawings, the elements or parts are not necessarily drawn to scale.

[0039] Figure 1 Photographs of Y2O3:0.7% Yb material irradiated with 980nm excitation light of different powers;

[0040] Where, a: before laser irradiation; b: 10W; c: 12W; d: 14W; e: 16W; f: 18W; g: 20W; h: after laser irradiation, the inset is a magnified image of a local area of ​​the sample after laser irradiation;

[0041] Figure 2 Schematic diagram of the spectrum and integrated intensity of light-induced blackbody absorption;

[0042] a: Luminescence spectra of Y2O3 materials under different 980nm excitation light powers (0-30W); b: Changes in the integrated intensity of photoinduced blackbody emission (400-800nm) and the scattering intensity of 980nm excitation light of Y2O3 materials as the 980nm excitation light power increases;

[0043] Figure 3 Schematic diagram of the scattering intensity of 980nm light on Y2O3 material before (curve 1) and after (curve 2) light-induced blackbody absorption;

[0044] The irradiation light used was a 980nm laser (0.5W), and the excitation light used was an 808nm laser (15W). Both laser beams were focused on the same point on the sample. When the 15W 808nm laser was present, the sample exhibited blackbody absorption, and the intensity of the 0.5W 980nm scattered light decreased significantly, indicating that the sample absorbed light much more strongly.

[0045] Figure 4 Schematic diagram of light-induced blackbody absorption and the strong light absorption phenomenon generated by the material;

[0046] a: Changes in the intensity of light emission (left) and scattering of 980nm excitation light (right) of Yb2O3 material before and after photoinduced blackbody absorption; b: Schematic diagram of photon avalanche upconversion luminescence; c: Changes in scattering intensity (curve 1) of five types of irradiated laser light (266nm, 405nm, 532nm, 650nm, 808nm, and 1560nm) before and after the occurrence of photoinduced blackbody absorption (curve 2); d: Under the photoinduced blackbody absorption state, the relative absorption (absorption ratio) of the sample to the six probe lasers is all above 90%, exhibiting strong light absorption characteristics;

[0047] Figure 5 Schematic diagram of a material thin-section transmission spectroscopy measurement device;

[0048] Figure 6 Schematic diagram of transmission spectrum and relative transmittance;

[0049] a: Transmission spectra of Yb2O3 material sheets under different irradiation powers of 980nm excitation light; b: Relative transmittance of Yb2O3 material sheets under different irradiation powers of 980nm excitation light;

[0050] Figure 7 A schematic diagram comparing the optically induced blackbody absorption spectra of Y2O3 materials pumped by 980nm lasers of different powers with the fitting curves of Planck's formula. Detailed Implementation

[0051] The embodiments of the technical solution of the present invention will be described in detail below with reference to the accompanying drawings. The following embodiments are only used to illustrate the technical solution of the present invention more clearly, and are therefore only examples and should not be used to limit the scope of protection of the present invention.

[0052] It should be noted that, unless otherwise stated, the technical or scientific terms used in this application should have the ordinary meaning as understood by one of ordinary skill in the art to which this invention pertains.

[0053] Example 1

[0054] This embodiment provides a method for photo-induced dramatic increase in the optical absorption of a material, specifically including the following steps:

[0055] Step 1: Preparation of Y2O3 material thin films;

[0056] All chemicals were of analytical grade and required no further purification before use; yttrium oxide (Y₂O₃, 99.99%) was supplied by Shanghai Aladdin Reagent Co., Ltd.

[0057] Place 5 mmol of the above powder into a tablet mold with a diameter of 12 mm, pressurize it to 8t using a BJ-15 flat tablet press (Tianjin, China), maintain the pressure for 20 seconds, release the pressure, and remove the tablet (approximately 2 mm thick).

[0058] Step 2: Utilize high power density (not less than 1W / mm²) 2 The excitation light is used to induce the material to produce photoinduced blackbody absorption.

[0059] Utilizing high power density (not less than 1W / mm) 2 A 980nm laser is used to irradiate a thin film of Y₂O₃ material. By adjusting the excitation power, the Y₂O₃ material film undergoes photoinduced blackbody absorption, thereby producing strong optical absorption characteristics; for example... Figure 1 As shown, Figure 1 Images show Y₂O₃:0.7%Yb thin films excited by 980nm excitation light of different powers. The images show that when the 980nm excitation light power exceeds 10W, it surpasses the threshold for photo-induced blackbody absorption, causing the Y₂O₃:0.7%Yb thin film to suddenly emit bright white light. Further increasing the pump power not only increases the luminescence intensity but also changes the emission color from yellow to white. (Comparison) Figure 1 a and Figure 1 As can be seen from h, there was no significant change in the material before and after excitation. As the excitation laser power increased from 0W to 30W, the changes in the emission spectrum and excitation light scattering intensity of the Y₂O₃ material before and after photo-induced blackbody absorption were recorded, such as... Figure 2 As shown.

[0060] Step 3: Measure the absorption of the material at 980nm after it is photoinduced;

[0061] Then, using an 808nm laser as the excitation source, the absorptivity of the material at 980nm was obtained. Under irradiation with an 808nm high-power laser, the optical absorption at 980nm of the Y₂O₃ material thin film before and after photoinduced blackbody absorption was measured. Figure 3 As shown, under the irradiation of a 15W 808nm laser, the Y2O3 material sheet undergoes photoinduced blackbody absorption, and the intensity of the 980nm scattered laser is significantly reduced compared to the case without excitation light, indicating that the material has strong optical absorption (over 90%) at 980nm.

[0062] Example 2

[0063] This embodiment provides a method for photo-induced dramatic increase in the optical absorption of a material, as detailed below:

[0064] A method for photo-induced dramatic increase in optical absorption of Yb2O3 material, specifically comprising the following steps:

[0065] Step 1: Preparation of Yb2O3 material thin sheets;

[0066] All chemicals were of analytical grade and required no further purification before use; yttrium oxide (Yb₂O₃, 99.99%) was supplied by Shanghai Aladdin Reagent Co., Ltd.

[0067] Place 5 mmol of powder into a tablet mold with a diameter of 12 mm, pressurize to 8 t using a BJ-15 flat tablet press (Tianjin, China), maintain the pressure for 20 s, release the pressure, and remove the tablet (approximately 2 mm thick).

[0068] Step 2: Select a suitable excitation source based on different materials to induce blackbody absorption;

[0069] By irradiating a Yb2O3 material sheet with a high-power 980nm laser, and adjusting the excitation light power, the Yb2O3 material sheet undergoes photoinduced blackbody absorption, thereby generating strong optical absorption characteristics.

[0070] Step 3: Detect the wavelength range of enhanced optical absorption of the material after it is photoinduced;

[0071] To probe the wavelength range of enhanced absorption, the intensity of scattered laser light at different wavelengths was examined. A pump laser (980 nm, 30 W) and six low-power (~100 mW) probe lasers (266 nm, 405 nm, 532 nm, 650 nm, 808 nm, and 1560 nm) were simultaneously irradiated onto a Yb₂O₃ sheet. When the sample became a bright blackbody under the pump laser irradiation, the scattering intensity of the six probe lasers suddenly decreased significantly, as shown in the image. Figure 4 As shown in c, this indicates that the sample exhibits strong optical absorption over a wide spectral range. Figure 4 As shown in d, the absorption rates of the six probe lasers are all above 90%, exhibiting obvious blackbody absorption characteristics. Figure 4 Figure a shows the changes in luminescence and 980nm laser scattering intensity of the Yb2O3 material sheet before and after the appearance of light-induced blackbody absorption. Figure 4 The 'b' represents a schematic diagram of the avalanche luminescence process;

[0072] Step 4: Measure the transmission spectrum of the Yb2O3 material sheet under excitation light irradiation;

[0073] When a Yb₂O₃ thin sheet undergoes photoinduced blackbody absorption under 980 nm excitation light, it is not only a bright emitter but also an excellent absorber. In this case, the intense white light emitted by the photoinduced blackbody absorption significantly interferes with our measurements of transmission and absorption spectra. To avoid this interference, a transmission and absorption spectral measurement and detection system based on a latch-up amplifier and an optical chopper was established, such as… Figure 5 As shown. The system uses a halogen lamp with a broadband spectrum as the light source. An optical chopper modulates the probe light transmitted through a Yb₂O₃ thin film. The modulated light is detected by a photomultiplier tube (PMT) on a 1000M spectrometer and converted into a photocurrent signal. A lock-in amplifier is used to amplify the transmitted signal. The transmission spectra of the Yb₂O₃ thin film are obtained by comparing the transmission signals with and without excitation light under 980nm excitation light irradiation at different powers, as shown. Figure 6 As shown in a. The corresponding relative transmittance (transmittance ratio) is calculated from the transmission spectrum, as shown in Figure a. Figure 6 As shown in b, we can see that after the thin-film sample enters the photoinduced blackbody radiation state, it exhibits extremely strong optical absorption in the range of 500–1500 nm, which is consistent with the results we obtained using scattered laser.

[0074] The preferred embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the specific details of the above embodiments. Within the scope of the technical concept of the present invention, various simple modifications can be made to the technical solution of the present invention, and these simple modifications all fall within the protection scope of the present invention.

[0075] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable manner without contradiction. In order to avoid unnecessary repetition, the present invention will not describe the various possible combinations separately.

[0076] Furthermore, various different embodiments of the present invention can be combined in any way, as long as they do not violate the spirit of the present invention, they should also be regarded as the content disclosed by the present invention.

Claims

1. A method for controlling the optical absorption of materials based on photoinduced modulation, characterized in that, Includes the following: Depending on the material, a suitable excitation source can be selected to induce blackbody absorption, or high-power-density excitation light can be used to induce the material to produce photo-induced blackbody absorption. Specifically, to induce blackbody absorption by selecting a suitable excitation source based on the material, it is necessary to ensure that the laser wavelength matches the characteristic absorption wavelength of the material in order to achieve the generation of light-induced blackbody absorption. When the wavelength of the working laser does not match the characteristic absorption wavelength of the material, a photoinduced blackbody absorbing material is coated on the surface of the material and irradiated with a matching induced laser, so that the surface of the material undergoes photoinduced blackbody absorption, thereby causing the material to strongly absorb the working laser. To induce photoinduced blackbody absorption in materials using high-power-density excitation light, it is necessary to ensure that the material used can absorb at least 0.1% of the excitation light. In the process of inducing photoinduced blackbody absorption using high-power-density excitation light, the materials employed include oxides, fluorides, MREF4, hybrid nanostructures, or carbon-based materials; wherein M is a Li, Na, K, or Ba metal element; and the oxides include Y2O3, La2O3, Lu2O3, Gd2O3, Yb2O3, ZrO2, and Y3Al5O3. 12 Ca 12 Al 14 O 33 Y2Si2O7, Y4Zr3O 12 YVO4, Sr2CeO4, Gd3Ga5O 12 Yb3Al5O 12 NdAlO3, PrO2, BaCuSi4O 10 The fluorides include YF3, LaF3, LuF3, GaF3, and YbF3; the MREF4 includes NaYF4, LiLaF4, BaLuF4, and KGdF4; the mixed nanostructures include Ag-SiO2-Er2O3, Yb2O3 / Au, Nd2O3 / Au, and Gd2O3 / Au; and the carbon-based materials include graphene and carbon nanotubes.

2. The method for controlling the optical absorption of materials based on photoinduced modulation as described in claim 1, characterized in that, The high power density is not less than 1 W / mm². 2 .

3. The method for controlling the optical absorption of materials based on photoinduced modulation as described in claim 1, characterized in that, The selection of a suitable excitation light source based on the material is as follows: If the material contains Yb 3+ Ions, blackbody absorption induced by a ~980 nm laser; if the material contains Er... 3+ Ions, blackbody absorption induced by a laser at ~1530 nm; if the material contains Nd... 3+ For ions, blackbody absorption is induced by a laser at ~1064 nm; if the material contains CdSe quantum dots, blackbody absorption is induced by a laser at 400 ~ 600 nm, depending on the size of the CdSe quantum dots, and so on, so that the light absorption coefficient of the material is greater than 90% in a wide wavelength range.

4. The method for controlling the optical absorption of materials based on photoinduced modulation as described in claim 3, characterized in that, The wideband is 200 nm to 2500 nm.

5. The method for controlling the optical absorption of materials based on photoinduced modulation as described in claim 1, characterized in that, The method specifically includes the following steps: Step 1: Preparation of Y2O3 material thin films; All chemicals are of analytical grade and require no further purification before use; Place 5 mmol of powder into a tablet mold with a diameter of 12 mm, pressurize to 8t using a BJ-15 flatbed tablet press, maintain the pressure for 20 s, release the pressure, and remove the tablet. Step 2: Use high-power-density excitation light to induce photoinduced blackbody absorption in the material; By irradiating a thin film of Y2O3 material with a high-power 980 nm laser, and by adjusting the excitation light power and the size of the focused spot, the thin film of Y2O3 material is made to undergo photoinduced blackbody absorption, thereby generating strong broadband optical absorption characteristics.

6. The application of the method for controlling material optical absorption based on photo-induced modulation as described in claim 1 in laser cutting or laser destruction, characterized in that, During laser cutting or laser destruction, when a specified wavelength of excitation light, which is easily absorbed by the material, induces the material to become a strong light-absorbing material, the high-power laser irradiated at the same time is strongly absorbed, thereby achieving the purpose of laser cutting or laser destruction of the irradiated object and improving the efficiency of the high-power laser used for laser cutting or laser destruction.

Images