Optical fiber incongruous micro-channel glass-based atomization core and manufacturing method and application thereof

Abstract

The invention relates to an optical fiber incongruous micro-channel glass-based atomization core and a manufacturing method and application thereof. The manufacturing method comprises the steps that an optical fiber blank plate is prepared, a plurality of vertically-arranged optical fiber microstructures are arranged in the optical fiber blank plate, each optical fiber microstructure comprises an external skin-layer glass tube and an internal core-layer glass rod, the face, exposed out of the core-layer glass rods, of each optical fiber microstructure serves as a first end face, and the face, arranged on the side face of the first end face, of each optical fiber microstructure serves as a second end face; an incongruous micro-channel is formed on the second end face; performing cold processing on the optical fiber blank plate with the incongruous micro-channel to obtain an incongruous micro-channel glass-based blank plate; etching the incongruous micro-channel glass substrate blank plate to form a through hole which is an optical fiber micro-channel, and combining the micro-channels in two directions to form a glass substrate with a transverse micro-channel and a longitudinal micro-channel; and heating layer coupling is carried out on the first end face of the glass substrate with the transverse and longitudinal microchannels, and the optical fiber incongruous microchannel glass-based atomization core is obtained. The method has the advantages that the use reliability is improved, the high-temperature cracking of the extract is reduced, and the flavor reduction degree is improved.

Description

Technical Field

[0001] This invention relates to the field of electronic atomization device manufacturing technology, specifically to an optical fiber anisotropic microchannel glass-based atomization core, its manufacturing method, and its applications. Background Technology

[0002] In recent years, electronic atomization technology has been rapidly popularized in the consumer and medical fields. As the core functional component of electronic atomization devices, the material properties and structural design of the atomizing core directly determine the atomization efficiency, flavor reproduction stability and product lifespan of e-liquid or extracts, becoming a key link restricting the technological upgrading of the industry.

[0003] Currently, the mainstream atomizer cores on the market are mainly made of cotton and ceramic materials. However, both have insurmountable technical defects in practical applications. Cotton cores rely on capillary action between fibers to achieve e-liquid adsorption and conduction. Although they have the advantages of fast wicking speed (0.3-0.5 mL / min under normal conditions) and low production cost, organic cotton fibers are prone to carbonization and scorching in high-temperature atomization environments (normal operating temperature 200-300℃). This not only produces a pungent burnt taste that degrades the flavor and fails to reproduce the true flavor of e-liquid or extracts, but also shortens the lifespan of the atomizer core. The normal lifespan of a cotton core atomizer core is only 500-1000 puffs. In addition, cotton fibers have poor high-temperature stability, and the thermal decomposition process may release volatile organic pollutants such as formaldehyde and benzene, posing safety hazards. At the same time, the contact uniformity between the cotton core and the heating element is insufficient, which can easily lead to localized overheating, with single-point temperatures reaching over 350℃, resulting in insufficient e-liquid atomization and further affecting the stability of the vapor production effect.

[0004] Ceramic cores achieve liquid conduction and heating through the microporous structure of a porous ceramic matrix. While they offer significantly improved high-temperature resistance (long-term operating temperature can reach over 350℃) compared to cotton cores and mitigate wicking issues to some extent, there is an inherent contradiction between the porosity of ceramic materials and the wicking speed. When the porosity is too high (greater than 60%), the excessively fast wicking speed can easily lead to e-liquid overflow; when the porosity is too low (less than 40%), insufficient wicking speed can easily cause "dry burning," resulting in a burnt taste. Furthermore, ceramic cores have a relatively small number of pores, with a typical pore density ≤100 pores / cm², and the pore size distribution is uneven, with a wide pore diameter distribution, typically 5-50μm. Over long-term use, pore blockage due to e-liquid residue buildup can lead to interrupted wicking and poor reliability. Additionally, during the high-temperature sintering process of ceramics (typically 1200-1500℃), heavy metal impurities in the raw materials, such as lead and cadmium, can easily migrate to the surface through lattice diffusion, according to GB standards. According to the 4806.4-2016 testing standard, some products have heavy metal leaching levels of 0.01-0.1 mg / L, posing a risk of inhalation to humans; in addition, the ceramic sintering process has poor consistency, with a yield rate usually below 70%, and the porous three-dimensional network is prone to retaining e-liquid impurities, which are difficult to remove through conventional cleaning methods, and long-term use can easily lead to flavor mixing problems.

[0005] Therefore, neither existing cotton wicks nor ceramic wicks can simultaneously meet the core requirements of "high oil conductivity, high temperature stability, safety and no harm, and authentic taste": cotton wicks conduct oil quickly, but have problems with burnt taste at high temperatures and release of harmful substances; ceramic wicks have excellent temperature resistance, but have risks of heavy metals, pore blockage and oil leakage, and cannot avoid the deterioration of the flavor of the extract at high temperatures.

[0006] Glass materials, due to their chemical inertness (complying with GB 4806.1-2016 "National Food Safety Standard for Food Contact Materials and Products - General Safety Requirements"), high purity (impurity content ≤10ppm), and precisely controllable microstructure, theoretically can fundamentally solve the aforementioned technical bottlenecks: their inorganic components avoid the high-temperature decomposition problem of organic cotton cores, their high purity eliminates the heavy metal risks of ceramic cores, and the melting and forming processes of glass are highly controllable, potentially enabling precise microchannel structure design. However, traditional glass processing technologies, such as mechanical drilling and sandblasting, struggle to achieve mass production of 5-100μm micron-level anisotropic microchannels. Furthermore, issues such as insufficient interfacial bonding between glass and metal heating components (conventional process bonding strength <2MPa) and poor thermal shock resistance of the glass matrix (prone to cracking at temperature differences >50℃) remain unresolved, hindering the industrial application of glass-based atomizing cores. Summary of the Invention

[0007] The main objective of this invention is to provide a method for manufacturing an optical fiber anisotropic microchannel glass-based atomizing core that improves reliability, reduces high-temperature pyrolysis of extracts, and enhances flavor reproduction.

[0008] To achieve the above objectives, the technical solution adopted by the present invention is as follows: A method for manufacturing an anisotropic microchannel glass-based atomizing core for optical fibers includes the following steps: (1) After coaxially nesting and combining the corrugated glass tube and the core glass rod, an optical fiber blank is prepared. The optical fiber blank has multiple vertically arranged optical fiber microstructures inside. The optical fiber microstructure includes an outer corrugated glass tube and an inner core glass rod. The side of the core glass rod that is exposed is the first end face, and the side of the first end face is the second end face. (2) A plurality of anisotropic microchannels are formed on the second end face at equal intervals; (3) The optical fiber blank with anisotropic microchannel is cold-processed to form anisotropic microchannel glass substrate blank; (4) The anisotropic microchannel glass substrate blank is etched to remove the core glass rod component in the fiber microstructure. The resulting through hole is the fiber microchannel. The microchannels in the two directions are combined to form a glass substrate with transverse and longitudinal microchannels. (5) The first end face of the glass substrate with transverse and longitudinal microchannels is coupled with a heating layer to finally form an optical fiber anisotropic microchannel glass substrate atomizing core.

[0009] The anisotropic microchannel is a preset microstructure formed by focusing a laser inside the fiber optic blank or at a specific depth, causing local micro-melting, micro-explosion, or phase change in the fiber optic blank.

[0010] The processing method of the anisotropic microchannel includes laser engraving or laser drilling; the side opposite to the second end face is the third end face, the anisotropic microchannel extends from the second end face to the third end face, and the anisotropic microchannel and the optical fiber microchannel form an intersection angle of 90°±5°.

[0011] The etching process includes acid etching or alternating acid-base wet etching of the anisotropic microchannel glass substrate, which allows the acid or alkali solution to react with the core glass rod in the fiber microstructure, ultimately causing the core glass rod to completely dissolve and form an array of fiber microchannels. The aperture of the optical fiber microchannel is 1-100 μm, and the aperture ratio is 10-95%. The anisotropic microchannels have a pore size of 5-70 μm and an opening ratio of 10-40%. The acid solution is selected from at least one of hydrochloric acid, nitric acid, sulfuric acid, and citric acid.

[0012] The heating layer is a metal film or metal sheet; the heating layer is deposited on the surface of the optical fiber microchannel using magnetron sputtering deposition technology; The metal film layer has ≥1 layer, and the metal film layer with two or more layers consists of two or more material film layers that are sputtered sequentially onto the surface of the first end face in a certain order; The metal film is selected from one of titanium, tantalum, tungsten, iron, copper, aluminum, gold, silver and platinum; the metal film is selected from one of iron alloy, tantalum alloy, copper alloy, aluminum alloy, nickel alloy and titanium alloy. The metal sheet is selected from one of copper, tungsten, nickel, iron, titanium, tantalum, gold, platinum, silver and aluminum; the metal sheet is selected from one of iron alloy, tantalum alloy, copper alloy, aluminum alloy, nickel alloy and titanium alloy.

[0013] The method for preparing the optical fiber blank includes the following steps: (1) The cladding glass tube and the core glass rod are coaxially nested together to form an optical fiber preform; the optical fiber preform is vertically placed in a vacuum heating furnace, and the cladding glass tube and the core glass rod are bonded together by a vacuum heating process; (2) The bonded optical fiber preform is fed into the drawing equipment and drawn to obtain an optical fiber monofilament; multiple optical fiber monofilaments are arranged to form a primary multifilament rod, and the primary multifilament rod is placed in the drawing equipment for further drawing to obtain a primary multifilament. (3) Place the primary multifilament in the arranging mold and arrange it according to the preset structure; bind and fix the arranged primary multifilament, then put the bound and fixed primary multifilament into the hot pressing mold, and then put the hot pressing mold containing the primary multifilament into the vacuum hot pressing furnace for melting and pressing operation. After the melting and pressing process in the vacuum hot pressing furnace is completed, the optical fiber blank to be processed is obtained. (4) Perform gradient annealing on the fiber optic blank to be processed; continuously monitor the temperature inside the furnace until it drops to room temperature, and then remove the annealed fiber optic blank from the furnace. (5) The annealed fiber blank is subjected to cold working to obtain the fiber blank.

[0014] Both the outer glass tube and the core glass rod are special glass materials with high transparency and low absorption. The transparency is ≥85% transmittance in the visible light band or at a specific laser wavelength; the linear absorption coefficient for the target laser wavelength is ≤0.1cm. -1 ; The fracture toughness of the aforementioned glass tube and core glass rod is ≥0.7 MPa*m. 1 / 2 ; The single fiber obtained in step (2) is adjusted according to the size of the desired fiber microchannel, and the fiber single fiber is arranged and drawn ≥1 time.

[0015] The material of the aforementioned corrugated glass tube is a special glass material that is resistant to acid and alkali corrosion and has a glass transition temperature between 500℃ and 800℃. The core glass rod is made of an acid-soluble special glass material with a glass transition temperature between 500℃ and 800℃. The glass transition temperature difference between the skin glass and the core glass of the optical fiber preform is ≤50℃, the percentage difference in the coefficient of thermal expansion is less than or equal to 20%, and the drawing temperature of the skin glass and the core glass is between 550-900℃.

[0016] The melting and pressing operation includes: evacuating the vacuum hot press furnace to a vacuum degree of less than 50 Pa, heating at a rate of 0.5-8℃ / min, first heating to 400-600℃ and holding for 20-180 minutes, then continuing to heat to 500-800℃ and holding for 1-5 hours, and finally heating to 500-900℃ and holding for 1-5 hours, then starting the press to apply pressure to the hot press mold, with the compression ratio controlled at 0.75-0.99; The gradient annealing process includes: after hot pressing, the optical fiber blank to be processed is kept at 500-900℃ for 1.5-2.5h, then cooled to 250-350℃ at a rate of 1-2℃ / min, then kept at that temperature for 20-40 minutes, and then allowed to cool naturally to room temperature.

[0017] The present invention also provides an optical fiber anisotropic microchannel glass-based atomizing core, which is prepared according to the preparation method of any one of claims 1-8.

[0018] The present invention also provides an application of the aforementioned fiber optic anisotropic microchannel glass-based atomizing core in electronic cigarettes, medical atomizers, flavoring atomizing devices, and health atomizing devices.

[0019] By employing the above technical solution, the present invention has at least the following advantages: (1) By controlling the thermal parameters of the skin and core glass, this invention not only satisfies the process compatibility of optical fiber drawing, but also solves the problems of energy dispersion and easy glass breakage during laser microstructuring caused by the difference in refractive index of traditional optical fiber materials. It has the characteristics of "dual compatibility" of materials and processes. At the same time, the combination of laser internal microstructuring technology and unidirectional array solid structure of optical fiber blank realizes the stable formation of cross-sectional and cross-sectional microchannels. The total number of pores per unit volume is huge, which is 10 times that of mainstream products on the market. The dense pore structure forms a "three-dimensional flow guiding network", which can greatly avoid oil leakage and blockage, greatly improve the reliability of atomizing core, and break through the technical bottleneck of traditional ceramic cores with few pores and easy blockage.

[0020] (2) The heating layer and the horizontal and vertical microchannels of the present invention are designed in a coordinated manner. According to the test, the atomization temperature is reduced by 30% compared with the traditional atomizing core. The lower atomization temperature can avoid the flavor deterioration caused by high temperature cracking of the extract, fully retain the volatile aroma components in the extract, enhance the optimal volatility performance of the extract, and achieve a more realistic and mellow taste. At the same time, the atomizing core does not use cotton material throughout the process, which eliminates the burnt taste produced by the high temperature carbonization of the traditional cotton core from the root, ensuring that it can provide a real plant taste or the original flavor of the extract from the first use to the end of its service life, and solving the core pain point of the deterioration of the taste of the traditional atomizing core.

[0021] (3) The transverse and longitudinal microchannel structure of the glass substrate of the present invention forms a “siphon-guide” synergistic system. The longitudinal through holes ensure rapid delivery of e-liquid, and the transverse anisotropic microchannels achieve uniform distribution of e-liquid and stable oil guiding rate, effectively avoiding the problem of insufficient e-liquid supply or leakage of traditional unidirectional channel atomizing cores. The high adhesion between the heating layer and the surface of the glass substrate makes the heat conduction uniform and improves the atomization efficiency by 20%-35%. In addition, the chemical inertness and high purity of the glass substrate eliminate the risk of release of harmful substances at high temperatures from cotton cores and precipitation of heavy metals from ceramic cores. The high flatness of the glass substrate surface, when coupled with the heating layer, can reduce the film thickness of the heating layer by 30%-50% compared with traditional ceramic cores, reducing material costs. Moreover, the glass substrate has excellent aging resistance, extending the service life of the atomizing core to 3000-5000 puffs, which is 5-6 times higher than cotton cores and 1.5-2 times higher than ceramic cores.

[0022] (4) This invention is particularly applicable to various high-efficiency atomization scenarios that require atomization efficiency, safety and flavor reproduction, such as electronic cigarettes, medical atomizers, flavor atomization equipment, and health care atomization devices.

[0023] The above description is merely an overview of the technical solution of the present invention. In order to better understand the technical means of the present invention and to implement it in accordance with the contents of the specification, the preferred embodiments of the present invention are described in detail below with reference to the accompanying drawings. Attached Figure Description

[0024] Figure 1 A flowchart illustrating a method for manufacturing an anisotropic microchannel glass-based atomizing core for an embodiment of the present invention; Figure 2 This is a schematic diagram of the structure of the optical fiber blank provided in an embodiment of the present invention; Figure 3 This is a schematic diagram of the structure of anisotropic microchannel glass substrate provided in an embodiment of the present invention; Figure 4 This is a schematic diagram of an anisotropic microchannel structure following a laser microstructure, provided in an embodiment of the present invention. Figure 5This is a schematic diagram of the anisotropic microchannel structure following another laser microstructure provided in an embodiment of the present invention; Figure 6 A schematic diagram of a glass substrate with transverse and longitudinal microchannels provided in an embodiment of the present invention; Figure 7 This is a schematic diagram of a heating layer coupling method provided in an embodiment of the present invention; Figure 8 This is a schematic diagram of another heating layer coupling method provided in an embodiment of the present invention; Figure 9 This is a schematic diagram of the structure of the optical fiber anisotropic microchannel glass-based atomizing core provided in an embodiment of the present invention. Detailed Implementation

[0025] To further illustrate the technical means and effects adopted by the present invention to achieve its intended purpose, the specific implementation methods, structures, features, and effects of the present invention will be described in detail below with reference to the accompanying drawings and preferred embodiments. In the following description, different "an embodiment" or "an embodiment" do not necessarily refer to the same embodiment. Furthermore, specific features, structures, or characteristics in one or more embodiments can be combined in any suitable form.

[0026] like Figure 1 The flowchart shown illustrates a method for manufacturing anisotropic microchannel glass-based atomizing core for optical fibers. First, an optical fiber preform is prepared. A cladding glass tube and a core glass rod are coaxially nested together to form an optical fiber preform. The preform undergoes multi-stage drawing and arrangement, followed by hot pressing and cold processing to form an array of optical fiber microstructures, resulting in the optical fiber preform. The preform is then microstructured internally using laser engraving or laser drilling. Anisotropic microchannels are formed on one end face of the preform. Next, the core material in the array of optical fiber microstructures is removed by etching the anisotropic microchannel glass-based preform, i.e., the core glass rod component is removed, forming the optical fiber microchannel. Finally, a heating layer is coupled, which is a metal sheet or metal film, resulting in the anisotropic microchannel glass-based atomizing core for optical fibers.

[0027] This invention is a glass-based atomizing core based on the synergistic design of fiber optic microstructures and anisotropic microchannels. Through the selection of special glass materials and innovative process design, combined with the excellent chemical inertness of the special glass materials, it has the advantages of low-temperature atomization, high porosity reliability, no burnt taste, and long service life. It achieves precise construction of anisotropic microchannels at the nanometer to micrometer scale, while solving the problem of insufficient interfacial bonding between glass and metal heating components. This invention couples a metal sheet or metal film layer onto the glass substrate sample. Due to the changes on the glass substrate surface, the adhesion between the two is strong. This invention also takes into account the requirements of rapid oil conduction and uniform atomization, and can reduce the atomization temperature to the range of 140-210℃, reducing the high-temperature decomposition of extracts and eliminating the risk of release of harmful substances and heavy metal precipitation from the root, ensuring the true flavor reproduction of the extracts. It provides the electronic atomization industry with a safer, more durable, and flavorful core component. Among them, 140-210℃ is the most effective volatility range for the material components of the e-liquid used. The extracted substances atomize at this temperature and have the best flavor.

[0028] like Figure 2 The diagram shows a structural schematic of an optical fiber preform 100. The optical fiber preform 100 is a cuboid, and its interior contains multiple vertically arranged optical fiber microstructures 101. Each optical fiber microstructure 101 includes an outer cladding glass tube and an inner core glass rod, meaning that the optical fiber microstructure 101 is coaxially composited from the cladding glass and the core glass. The side exposing the multiple core glass rods is designated as the first end face 110, and the side of the first end face 110 is designated as the second end face 1120. The optical fiber preform 100 undergoes a series of steps, including optical fiber preform preparation, multi-stage drawing, hot pressing, gradient annealing, and cold processing, ultimately forming a composite glass matrix with regularly arranged optical fiber microstructures 101 inside. Specifically, leveraging the scaling characteristics of high-precision fiber drawing technology, the core and sheath composite structure of the initial fiber preform can be proportionally scaled vertically. After single-filament and multifilament drawing, a fiber array with nanometer to micrometer scale is formed. Then, hot pressing is used to achieve tight bonding between the fibers, combined with gradient annealing to eliminate internal stress and precision cold working to ensure dimensional accuracy. Finally, a uniformly distributed, intact, and oriented fiber microstructure 101 is constructed inside the fiber preform, providing a precise structural foundation for subsequent etching to form fiber microchannels. This process, through the controllable advantages of the fiber microstructure 101 in fiber manufacturing technology, solves the technical challenge of achieving nanometer to micrometer scale regular channel arrays in traditional glass processing, ensuring the proportional stability of the core-sheath structure during scaling. This provides a reliable prerequisite for selectively removing the core glass and forming uniform longitudinal channels in the subsequent acid etching process.

[0029] like Figure 2 and 3The diagram shows a schematic of the anisotropic microchannel glass substrate 102. Regularly arranged anisotropic microchannels 111 are fabricated on the processing surface using a laser micromachining device. The processing surface is either the second end face 1120 or the fourth end face 1140, preferably the longer side, i.e., the second end face 1120, which yields better results. The fourth end face 1140 is a side adjacent to the second end face 1120, and the third end face 1130 is a side opposite to the second end face 1120. The anisotropic microchannel glass substrate 102 includes fiber optic microstructures 101 and anisotropic microchannels 111. The formation of regularly arranged anisotropic microchannels 111 on the processing surface is a fiber optic substrate processing method based on laser internal microstructuring. Forming regularly arranged anisotropic microchannels 111 on the second end face 1120 of the fiber optic substrate 100 is a processing technique that uses laser focusing on the interior of the glass or a specific depth to cause localized micro-melting, micro-explosion, or phase transition, forming a predetermined microstructure. This includes laser engraving, laser drilling, etc.

[0030] See Figure 2 and Figure 3 The fiber microstructures 101 of the fiber blank 100 are regularly arranged along a preset direction, forming a natural "orientation structure benchmark". When laser drilling forms the anisotropic microchannels 111, the laser path can be precisely planned along the direction perpendicular to the axis of the fiber microstructure 101, ensuring that the angle between the axis of the transverse anisotropic microchannel and the axis of the longitudinal through hole is 90°±5°, with an angle deviation of ≤±5°, avoiding the "oil guide dead zone caused by the misalignment of the channel" in the traditional disordered structure.

[0031] The linear absorption coefficient of the outer and core glass layers of the optical fiber blank in this invention is ≤0.1cm⁻¹, which is much lower than that of ceramics (1-5cm⁻¹). The laser energy can penetrate the surface layer and reach the internal focal point, avoiding the surface overheating and edge chipping problems caused by high absorption in traditional materials.

[0032] Figure 4 The diagram shows a schematic of a heterogeneous microchannel structure after laser microstructuring. The through hole formed by laser drilling is laser-drilled channel 111A.

[0033] Laser engraving relies on nonlinear absorption and internal micro-explosion effects to form channels: Utilizing the low linear absorption of laser light by glass, a laser beam is focused through the glass surface to a predetermined depth. At the focal point, the energy density instantaneously exceeds the glass's breakage threshold, causing localized melting, vaporization, and micro-explosion, forming micron-sized cavities. A CNC system controls the focal point to move along a preset path, and adjacent cavities are continuously superimposed to form interconnected microchannels, resembling a continuous string of candied hawthorns. Figure 4 The schematic diagram of the laser engraving channel 111B is shown.

[0034] Figure 5The diagram shows a different microchannel structure after laser microstructure, with the through hole formed by laser engraving being the laser engraving channel 111B.

[0035] Laser drilling employs a surface-focused, layer-by-layer ablation mechanism: a laser beam is directly focused onto the glass surface, and high-power-density pulsed laser light ablates the glass material layer by layer. Simultaneously, assist gas is used to blow away molten debris, creating a through-hole extending from the surface to the interior. Figure 5 The schematic diagram of the laser drilling channel 111A is shown in the figure.

[0036] While both laser engraving and laser drilling utilize laser light sources, their underlying principles and technologies differ. Laser-drilled microchannels typically have a circular cross-section, while laser-engraved microchannels have a skewer-like cross-section. Laser drilling offers better precision in terms of aperture deviation compared to laser engraving, and its inner walls are relatively smooth. The skewer-shaped laser-engraved microchannel, with its rough inner walls, is more conducive to e-liquid adsorption. Combined with the crisscrossing fiber optic microchannels, its strong adsorption properties evenly distribute the e-liquid delivered by the vertical through-holes below the heating layer, preventing insufficient e-liquid supply that can lead to dry burning and carbon buildup. The smooth inner walls of laser-drilled microchannels also reduce e-liquid flow resistance, while the regular circular cross-section ensures stable e-liquid delivery rates. High-precision dimensional control allows for precise coupling of "one horizontal hole corresponding to one vertical through-hole," preventing uneven e-liquid supply. The two methods of preparing anisotropic microchannels rely on high-speed oil guiding characteristics to ensure precise e-liquid supply and avoid dry burning, while their uniform oil distribution characteristics enable e-liquid diffusion and avoid local overheating; forming a unique "main-branch synergistic structure".

[0037] like Figure 6 The diagram shows a glass substrate 130 with transverse and longitudinal microchannels. The optical fiber microchannels 131, perpendicular to the anisotropic microchannels 111, are arranged in an array. The transverse and longitudinal through-hole channels are interconnected between the optical fiber microchannels 131 and the anisotropic microchannels 111, and the internal structures of each channel are interconnected.

[0038] like Figure 7 The diagram shows a coupling method for the heating layer. A metal sheet 140 is coupled to a glass substrate 130 with horizontal and vertical microchannels, and the metal sheet 140 is coupled to the surface of an optical fiber microchannel 131.

[0039] like Figure 8 The diagram shows another coupling method for the heating layer. A metal film 150 is deposited on a glass substrate 130 with horizontal and vertical microchannels using deposition techniques such as magnetron sputtering. The metal film 150 is then coupled to the surface of the optical fiber microchannel 131.

[0040] The metal film is selected from one of titanium, tantalum, tungsten, iron, copper, aluminum, gold, silver, and platinum; the metal film is selected from one of iron alloy, tantalum alloy, copper alloy, aluminum alloy, nickel alloy, and titanium alloy. The number of metal film layers is ≥1 layer; if there are two or more metal film layers, it means that two or more material film layers are sequentially sputtered onto the surface end of the first end face in a certain order. The metal sheet is selected from one of copper, tungsten, nickel, iron, titanium, tantalum, gold, platinum, silver, and aluminum; or from one of iron alloys, tantalum alloys, copper alloys, aluminum alloys, nickel alloys, and titanium alloys. The metal sheet coupling can be laser welded or adhesively bonded, such as with glass enamel sealing. After two precision cold-working processes during the preparation of the glass substrate, the flatness of the heating layer coupling surface is far superior to that of the ceramic core, significantly improving the bonding force between the metal film or metal sheet and the glass substrate—more than twice that of traditional ceramic cores. This characteristic ensures that the heating layer of the atomizing core does not peel or flake during long-term use. Traditional ceramic cores, due to their rough surface, have a film peeling rate ≥10%, and excellent resistance stability (resistance change rate ≤±2%), avoiding atomization temperature fluctuations caused by poor contact.

[0041] Figure 9 The diagram shows a schematic of anisotropic microchannel glass-based atomizing core 170 for optical fibers. After cold processing, the optical fiber blank undergoes laser microstructuring, etching, and coupling with a heating layer to form a crisscrossing microchannel glass-based structure, namely the anisotropic microchannel glass-based atomizing core 170 for optical fibers. The anisotropic microchannel glass-based atomizing core 170 for optical fibers consists of optical fiber microchannels 131, anisotropic microchannels 111, and a heating layer 160. Figure 9 The internal structure of the fiber optic anisotropic microchannel glass-based atomizing core 170 is clearly visible, with interlaced microchannels.

[0042] The first end face of the fiber optic microchannel 131 is the "longitudinal through-hole inlet" of the atomizing core. The fiber optic microchannel 131 serves as the "main channel" for e-liquid to enter the atomization zone from the oil storage chamber. The heating layer 160 directly covers the fiber optic microchannel 131, forming the shortest heat conduction path: "heating layer → longitudinal through-hole inlet → e-liquid". In contrast to traditional designs, where the heating layer of the ceramic core is often located on the side or inside of a porous substrate, heat must penetrate the substrate to contact the e-liquid, resulting in a heat loss of 30%-50%. The heat conduction efficiency of this invention is ≥80%, allowing for full evaporation of the e-liquid at low atomization temperatures, thus avoiding flavor degradation caused by high temperatures.

[0043] The fiber optic microchannel 131 and the anisotropic microchannel 111 on the first end face of the heating layer 160 form a "three-dimensional supply network": the fiber optic microchannel 131 quickly delivers e-liquid to the heating area, and the anisotropic microchannel 111 evenly disperses the e-liquid on the surface of the heating layer. When the heating layer 160 is activated, the siphon effect of the formed horizontal and vertical channels can instantly replenish the e-liquid, solving the dry burning problem caused by the "misalignment of the heating area and the e-liquid supply channel" in traditional atomizer cores.

[0044] The present invention will be further described below through specific embodiments: Example 1 A method for manufacturing an anisotropic microchannel glass-based atomizing core for optical fibers includes the following steps: (1) A 3mm thick corrugated glass tube and a 30mm inner diameter core glass rod are coaxially nested together to form a well-structured optical fiber preform; the optical fiber preform is vertically placed in a vacuum heating furnace with a vacuum degree of less than 50pa, and the corrugated glass tube and the core glass rod are bonded together by vacuum heating process. Both the outer and core glass materials are special glass materials with high transparency and low absorption. Their transparency is 87% in the visible light band or at specific laser wavelengths; the linear absorption coefficient for the target laser wavelength is 0.09 cm⁻¹. -1 .

[0045] The fracture toughness of the skin glass material and the core glass material is 0.9 MPa*m. 1 / 2 Special glass materials with controllable optical absorption and good thermal stability.

[0046] The aforementioned skin glass material is a special glass material with a glass transition temperature of 650℃ and resistance to acid and alkali corrosion.

[0047] The core glass material is an acid-soluble special glass material with a glass transition temperature of 620℃.

[0048] The glass transition temperature difference between the skin glass and the core glass of the optical fiber preform is ≤50℃, and the percentage difference in the coefficient of thermal expansion should be less than or equal to 20%.

[0049] (2) The bonded 36mm outer diameter optical fiber preform is fed into a high-precision special drawing equipment and drawn at 760℃ to obtain an optical fiber monofilament; then, multiple optical fiber monofilaments are arranged according to the preset design to form a primary multifilament rod, and the primary multifilament rod is placed in the high-precision special drawing equipment. A section of the primary multifilament rod is vacuumed and further drawn at 740℃ by the equipment's drawing wheel to obtain a primary multifilament; the preset design is to design the cross-section of the primary multifilament rod to be of any shape, usually a regular hexagon, square, rectangle, triangle or circle. In this embodiment, it is a regular hexagon; (3) Place the primary multifilament in the plate mold and arrange it into a regular hexagonal cross section. Then bind and fix the primary multifilament with copper wire. Then put the bound and fixed primary multifilament into the hot pressing mold. Then put the hot pressing mold containing the primary multifilament into the vacuum hot pressing furnace. Evacuate the vacuum to a vacuum degree of less than 50 Pa. Heat up at a rate of 1℃ / min. First heat up to 540℃ and hold for 30 minutes. Then continue to heat up to 580℃ and hold for 1 hour. Finally heat up to 640℃ and hold for 3 hours. Then start the press to apply pressure to the hot pressing mold. The compression ratio is controlled at 0.95. After the melting and pressing process in the vacuum hot pressing furnace is completed, the optical fiber blank to be processed is obtained. (4) Gradient annealing treatment of the fiber optic blank to be processed: After hot pressing, the fiber optic blank to be processed is kept at 640°C for 2 hours, then cooled to 300°C at a rate of 1°C / min, and then kept at 30 minutes. After that, the power is turned off and the blank is allowed to cool down naturally in the furnace. The temperature in the furnace is continuously monitored until it drops to room temperature of 25°C. Then the annealed fiber optic blank is taken out of the furnace. (5) Perform precision cold processing on the annealed fiber optic blank, including cutting off the ends and carving the outer contour of the fiber optic blank into a cuboid to obtain the fiber optic blank.

[0050] (6) The fiber optic blank has multiple vertically arranged fiber optic microstructures inside. The fiber optic microstructures include an outer cladding glass tube and an inner core glass rod. The side of the core glass rods exposed is the first end face, and the side of the first end face is the second end face. The second end face is the processing surface. Multiple anisotropic microchannels are regularly arranged with equal spacing by laser drilling on the processing surface. The aperture of the anisotropic microchannels is 50 μm and the aperture ratio is 30%. The anisotropic microchannels extend along the length of the fiber optic blank to the third end face. The third end face is the opposite side of the second end face. The anisotropic microchannels and the fiber optic microstructures form a 90° intersection angle to ensure the three-dimensional continuity of the channel network. (7) The optical fiber blank with anisotropic microchannel is cut and cold-processed by grinding and polishing to form anisotropic microchannel glass substrate blank; (8) The anisotropic microchannel glass substrate is etched, and the anisotropic microchannel glass substrate is placed in 0.5mol / L nitric acid solution and heated and stirred at 60°C to remove the core glass rod component in the fiber microstructure. The formed through hole is the fiber microchannel, and the microchannels in the two directions are combined to form a glass substrate with transverse and longitudinal microchannels. The aperture of the fiber microchannel is 50um and the aperture ratio is 90%.

[0051] (9) The first end face of the glass substrate with transverse and longitudinal microchannels is coupled with a metal sheet. The metal sheet is a copper sheet. The copper sheet is coupled to the surface of the optical fiber microchannel by laser welding, and finally the optical fiber anisotropic microchannel glass substrate atomizing core is formed.

[0052] Example 2 A method for manufacturing an anisotropic microchannel glass-based atomizing core for optical fibers includes the following steps: (1) A 3mm thick corrugated glass tube and a 30mm inner diameter core glass rod are coaxially nested together to form a well-structured optical fiber preform; the optical fiber preform is vertically placed in a vacuum heating furnace with a vacuum degree of less than 50pa, and the corrugated glass tube and the core glass rod are bonded together by vacuum heating process. Both the outer and core glass materials are special glass materials with high transparency and low absorption. Their transparency is 90% in the visible light band or at specific laser wavelengths; the linear absorption coefficient for the target laser wavelength is 0.1 cm⁻¹. -1 .

[0053] The fracture toughness of the skin glass material and the core glass material is 0.7 MPa*m. 1 / 2 Special glass materials with controllable optical absorption and good thermal stability.

[0054] The aforementioned skin glass material is a special glass material with a glass transition temperature of 500℃ and resistance to acid and alkali corrosion.

[0055] The core glass material is an acid-soluble special glass material with a glass transition temperature of 550℃.

[0056] The glass transition temperature difference between the skin glass and the core glass of the optical fiber preform is ≤50℃, and the percentage difference in the coefficient of thermal expansion should be less than or equal to 20%.

[0057] (2) The bonded 36mm outer diameter optical fiber preform is fed into a high-precision special drawing equipment and drawn at 600℃ to obtain an optical fiber monofilament; then, multiple optical fiber monofilaments are arranged according to the preset design to form a primary multifilament rod, and the primary multifilament rod is placed in the high-precision special drawing equipment. A section of the primary multifilament rod is vacuumed and drawn further at 620℃ by the equipment drawing wheel to obtain a primary multifilament; the preset design shape in this embodiment is square; (3) Place the primary multifilament in the plate mold and arrange it into a regular hexagonal cross section. Then bind and fix the primary multifilament with copper wire. Then put the bound and fixed primary multifilament into the hot pressing mold. Then put the hot pressing mold containing the primary multifilament into the vacuum hot pressing furnace. Evacuate the vacuum to a vacuum degree of less than 50 Pa. Heat up at a rate of 1℃ / min. First heat up to 540℃ and hold for 30 minutes. Then continue to heat up to 580℃ and hold for 1 hour. Finally heat up to 590℃ and hold for 3 hours. Then start the press to apply pressure to the hot pressing mold. The compression ratio is controlled at 0.85. After the melting and pressing process in the vacuum hot pressing furnace is completed, the optical fiber blank to be processed is obtained. (4) The fiber optic blank to be processed is subjected to gradient annealing. After hot pressing, the fiber optic blank to be processed is kept at 590°C for 2 hours, then the temperature is reduced to 350°C at a rate of 1°C / min, and then kept at 350°C for 20 minutes. The temperature inside the furnace is continuously monitored until it drops to room temperature of 30°C. Then the annealed fiber optic blank is taken out of the furnace. (5) Perform precision cold processing on the annealed fiber optic blank, including cutting off the ends and carving the outer contour of the fiber optic blank into a cuboid to obtain the fiber optic blank.

[0058] (6) The fiber optic blank has multiple vertically arranged fiber optic microstructures inside. The fiber optic microstructures include an outer cladding glass tube and an inner core glass rod. The side of the core glass rods exposed is the first end face, and the side of the first end face is the second end face. The second end face is the processing surface. Multiple anisotropic microchannels are regularly arranged with the same distance by laser drilling on the processing surface. The aperture of the anisotropic microchannels is 5 μm and the aperture ratio is 40%. The anisotropic microchannels extend along the length of the fiber optic blank to the third end face. The third end face is the opposite side of the second end face. The anisotropic microchannels and the fiber optic microstructures form an 85° intersection angle to ensure the three-dimensional continuity of the channel network. (7) The optical fiber blank with anisotropic microchannel is cut and cold-processed by grinding and polishing to form anisotropic microchannel glass substrate blank; (8) Etching the anisotropic microchannel glass substrate blank, placing the anisotropic microchannel glass substrate in 0.5mol / L sulfuric acid solution, heating and stirring at 60°C, and changing the acid every 2 hours until the core glass rod component in the optical fiber microstructure is removed, and the formed through hole is the optical fiber microchannel. The two microchannels are combined to form a glass substrate with transverse and longitudinal microchannels. The aperture of the optical fiber microchannel is 100um and the aperture ratio is 10%.

[0059] (9) The first end face of the glass substrate with transverse and longitudinal microchannels is coupled with a metal sheet. The metal sheet is a stainless steel sheet. The stainless steel sheet is coupled to the surface of the optical fiber microchannel by glass glaze sealing, and finally an optical fiber anisotropic microchannel glass substrate atomizing core is formed.

[0060] Example 3 A method for manufacturing an anisotropic microchannel glass-based atomizing core for optical fibers includes the following steps: (1) A 3mm thick corrugated glass tube and a 30mm inner diameter core glass rod are coaxially nested together to form a well-structured optical fiber preform; the optical fiber preform is vertically placed in a vacuum heating furnace with a vacuum degree of less than 50pa, and the corrugated glass tube and the core glass rod are bonded together by vacuum heating process. Both the outer and core glass materials are special glass materials with high transparency and low absorption. Their transparency is 85% in the visible light band or at specific laser wavelengths; the linear absorption coefficient for the target laser wavelength is 0.08 cm⁻¹. -1 .

[0061] The fracture toughness of the skin glass material and the core glass material is 0.8 MPa*m. 1 / 2 Special glass materials with controllable optical absorption and good thermal stability.

[0062] The aforementioned skin glass material is a special glass material with a glass transition temperature of 790℃ and resistance to acid and alkali corrosion.

[0063] The core glass material is an acid-soluble special glass material with a glass transition temperature of 800℃.

[0064] The glass transition temperature difference between the skin glass and the core glass of the optical fiber preform is ≤50℃, and the percentage difference in the coefficient of thermal expansion should be less than or equal to 20%.

[0065] (2) The bonded 36mm outer diameter optical fiber preform is fed into a high-precision special drawing equipment and drawn at 820℃ to obtain an optical fiber monofilament; then, multiple optical fiber monofilaments are arranged according to the preset design to form a primary multifilament rod, and the primary multifilament rod is placed in the high-precision special drawing equipment. A section of the primary multifilament rod is vacuumed and drawn further at 815℃ by the equipment drawing wheel to obtain a primary multifilament; the preset design shape in this embodiment is rectangular; (3) Place the primary multifilaments in the arranging mold, arranging them into a regular hexagonal cross-section. Bundle and fix the arranged primary multifilaments with copper wire. Then, put the bundled and fixed primary multifilaments into the hot pressing mold. Place the hot pressing mold containing the primary multifilaments into a vacuum hot pressing furnace. Evacuate the vacuum to a vacuum degree of less than 50 Pa. Heat at a rate of 1℃ / min. First, heat to 540℃ and hold for 30 minutes. Then, continue to heat to 680℃ and hold for 1 hour. Finally, heat to 790℃ and hold for 3 hours. Then, start the press to apply pressure to the hot pressing mold. The compression ratio is controlled at 0.9. After the melting and pressing process in the vacuum hot pressing furnace is completed, the optical fiber blank to be processed is obtained. (4) The fiber optic blank to be processed is subjected to gradient annealing. After hot pressing, the fiber optic blank to be processed is kept at 790°C for 2 hours, then the temperature is reduced to 250°C at a rate of 1°C / min, and then kept at 250°C for 40 minutes. The temperature inside the furnace is continuously monitored until it drops to room temperature of 20°C. Then the annealed fiber optic blank is taken out of the furnace. (5) Perform precision cold processing on the annealed fiber optic blank, including cutting off the ends and carving the outer contour of the fiber optic blank into a cuboid to obtain the fiber optic blank.

[0066] (6) The fiber optic blank has multiple vertically arranged fiber optic microstructures inside. The fiber optic microstructures include an outer cladding glass tube and an inner core glass rod. The side of the core glass rods exposed is the first end face, and the side of the first end face is the second end face. The second end face is the processing surface. Multiple anisotropic microchannels are regularly arranged with equal spacing by laser drilling on the processing surface. The aperture of the anisotropic microchannels is 70 μm and the aperture ratio is 10%. The anisotropic microchannels extend along the length of the fiber optic blank to the third end face. The third end face is the opposite side of the second end face. The anisotropic microchannels and the fiber optic microstructures form a 95° intersection angle to ensure the three-dimensional continuity of the channel network. (7) The optical fiber blank with anisotropic microchannel is cut and cold-processed by grinding and polishing to form anisotropic microchannel glass substrate blank; (8) The anisotropic microchannel glass substrate blank is etched to remove the core glass rod component in the optical fiber microstructure. The resulting through hole is an optical fiber microchannel. The two microchannels are combined to form a glass substrate with transverse and longitudinal microchannels. The aperture of the optical fiber microchannel is 1 μm and the aperture ratio is 95%.

[0067] (9) A metal film layer is coupled to the first end face of the glass substrate with transverse and longitudinal microchannels. The metal film layer is an aluminum film layer. The aluminum film layer is deposited on the surface of the first end face of the optical fiber microchannel by magnetron sputtering deposition technology, and finally an optical fiber anisotropic microchannel glass substrate atomization core is formed.

[0068] Example 4 A method for manufacturing an anisotropic microchannel glass-based atomizing core for optical fibers includes the following steps: (1) A 3mm thick corrugated glass tube and a 30mm inner diameter core glass rod are coaxially nested together to form a well-structured optical fiber preform; the optical fiber preform is vertically placed in a vacuum heating furnace with a vacuum degree of less than 50pa, and the corrugated glass tube and the core glass rod are bonded together by vacuum heating process. Both the outer and core glass materials are special glass materials with high transparency and low absorption. Their transparency is 87% in the visible light band or at specific laser wavelengths; the linear absorption coefficient for the target laser wavelength is 0.09 cm⁻¹. -1 .

[0069] The fracture toughness of the skin glass material and the core glass material is 0.9 MPa*m. 1 / 2 Special glass materials with controllable optical absorption and good thermal stability.

[0070] The aforementioned skin glass material is a special glass material with a glass transition temperature of 650℃ and resistance to acid and alkali corrosion.

[0071] The core glass material is an acid-soluble special glass material with a glass transition temperature of 620℃.

[0072] The glass transition temperature difference between the skin glass and the core glass of the optical fiber preform is ≤50℃, and the percentage difference in the coefficient of thermal expansion should be less than or equal to 20%.

[0073] (2) The bonded 36mm outer diameter optical fiber preform is fed into a high-precision special drawing equipment and drawn at 760°C to obtain an optical fiber monofilament; then, multiple optical fiber monofilaments are arranged according to the preset design to form a primary multifilament rod, and the primary multifilament rod is placed in the high-precision special drawing equipment. A section of the primary multifilament rod is vacuumed and drawn further at 740°C by the equipment drawing wheel to obtain a primary multifilament; this embodiment is rectangular; (3) The primary multifilament is arranged in the mold to form a secondary multifilament rod. Then, the secondary multifilament rod is drawn into a secondary multifilament using a high-precision special drawing equipment. The secondary multifilament is placed in the plate-laying mold and arranged into a regular hexagonal cross section. The arranged secondary multifilament is then bound and fixed with copper wire. The bound and fixed secondary multifilament is then placed into a hot pressing mold. The hot pressing mold containing the secondary multifilament is then placed into a vacuum hot pressing furnace. The vacuum is evacuated to a vacuum degree of less than 50 Pa. The temperature is increased at a rate of 1℃ / min. First, the temperature is increased to 540℃ and held for 30 minutes. Then, the temperature is increased to 580℃ and held for 1 hour. Finally, the temperature is increased to 650℃ and held for 3 hours. Then, the press is started to apply pressure to the hot pressing mold. The compression ratio is controlled at 0.95. After the melting and pressing process in the vacuum hot pressing furnace is completed, the optical fiber blank to be processed is obtained.

[0074] (4) Gradient annealing treatment of the fiber optic blank to be processed: After hot pressing, the fiber optic blank to be processed is kept at 650°C for 2 hours, then the temperature is reduced to 300°C at a rate of 1°C / min, and then kept at 30 minutes. After that, the power is turned off and the temperature is allowed to drop naturally in the furnace. The temperature in the furnace is continuously monitored until it drops to room temperature of 25°C. Then the annealed fiber optic blank is taken out of the furnace. (5) Perform precision cold processing on the annealed fiber optic blank, including cutting off the ends and carving the outer contour of the fiber optic blank into a cuboid to obtain the fiber optic blank.

[0075] (6) The fiber optic blank has multiple vertically arranged fiber optic microstructures inside. The fiber optic microstructures include an outer cladding glass tube and an inner core glass rod. The side of the core glass rods exposed is the first end face, and the side of the first end face is the second end face. The second end face is the processing surface. Multiple anisotropic microchannels are regularly arranged with equal spacing by laser drilling on the processing surface. The aperture of the anisotropic microchannels is 70 μm and the aperture ratio is 10%. The anisotropic microchannels extend along the length of the fiber optic blank to the third end face. The third end face is the opposite side of the second end face. The anisotropic microchannels and the fiber optic microstructures form a 95° intersection angle to ensure the three-dimensional continuity of the channel network. (7) The optical fiber blank with anisotropic microchannel is cut and cold-processed by grinding and polishing to form anisotropic microchannel glass substrate blank; (8) The anisotropic microchannel glass substrate preform is etched by alternating acid and alkali treatment. First, the anisotropic microchannel glass substrate preform is placed in a 0.7 mol / L nitric acid solution and sonicated for 1 hour. Then, it is taken out and placed in a 0.3 mol / L sodium hydroxide solution and sonicated for 30 minutes. This process is repeated 4 times. The core glass rod component in the optical fiber microstructure is removed, and the resulting through-holes are optical fiber microchannels. The two microchannels are combined to form a glass substrate with transverse and longitudinal microchannels. The aperture of the optical fiber microchannel is 1 μm, and the aperture ratio is 95%.

[0076] (9) Metal film coupling is performed on the first end face of the glass substrate with transverse and longitudinal microchannels. First, a titanium film is deposited on the surface of the glass substrate, and then stainless steel is further deposited on the surface of the titanium film. Finally, an optical fiber anisotropic microchannel glass substrate atomizing core is formed.

[0077] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Although the present invention has been disclosed above with reference to preferred embodiments, it is not intended to limit the present invention. Any person skilled in the art can make some modifications or alterations to the above-disclosed technical content to create equivalent embodiments without departing from the scope of the present invention. Any simple modifications, equivalent changes, and alterations made to the above embodiments based on the technical essence of the present invention without departing from the scope of the present invention shall still fall within the scope of the present invention.

Claims

1. A method for manufacturing an anisotropic microchannel glass-based atomizing core for optical fibers, characterized in that: Includes the following steps: (1) After coaxially nesting and combining the corrugated glass tube and the core glass rod, an optical fiber blank is prepared. The optical fiber blank has multiple vertically arranged optical fiber microstructures inside. The optical fiber microstructure includes an outer corrugated glass tube and an inner core glass rod. The side of the core glass rod that is exposed is the first end face, and the side of the first end face is the second end face. (2) A plurality of anisotropic microchannels are formed on the second end face at equal intervals; (3) The optical fiber blank with anisotropic microchannel is cold-processed to form anisotropic microchannel glass substrate blank; (4) The anisotropic microchannel glass substrate blank is etched to remove the core glass rod component in the fiber microstructure. The resulting through hole is the fiber microchannel. The microchannels in the two directions are combined to form a glass substrate with transverse and longitudinal microchannels. (5) The first end face of the glass substrate with transverse and longitudinal microchannels is coupled with a heating layer to finally form an optical fiber anisotropic microchannel glass substrate atomizing core.

2. The manufacturing method according to claim 1, characterized in that, The anisotropic microchannel is a preset microstructure formed by focusing a laser inside the fiber optic blank or at a specific depth, causing local micro-melting, micro-explosion, or phase change in the fiber optic blank.

3. The manufacturing method according to claim 2, characterized in that, The processing method of the anisotropic microchannel includes laser engraving or laser drilling; the side opposite to the second end face is the third end face, the anisotropic microchannel extends from the second end face to the third end face, and the anisotropic microchannel and the optical fiber microchannel form an intersection angle of 90°±5°.

4. The manufacturing method according to claim 3, characterized in that, The etching process includes acid etching or alternating acid-base wet etching of the anisotropic microchannel glass substrate, which allows the acid or alkali solution to react with the core glass rod in the fiber microstructure, ultimately causing the core glass rod to completely dissolve and form an array of fiber microchannels. The aperture of the optical fiber microchannel is 1-100 μm, and the aperture ratio is 10-95%. The anisotropic microchannels have a pore size of 5-70 μm and an opening ratio of 10-40%. The acid solution is selected from at least one of hydrochloric acid, nitric acid, sulfuric acid, and citric acid.

5. The manufacturing method according to claim 4, characterized in that, The heating layer is a metal film or metal sheet; the heating layer is deposited on the surface of the optical fiber microchannel using magnetron sputtering deposition technology; The metal film layer has ≥1 layer, and two or more metal film layers are formed by sputtering two or more material film layers sequentially onto the surface of the first end face in a certain order; The metal film is selected from one of titanium, tantalum, tungsten, iron, copper, aluminum, gold, silver and platinum; the metal film is selected from one of iron alloy, tantalum alloy, copper alloy, aluminum alloy, nickel alloy and titanium alloy. The metal sheet is selected from one of copper, tungsten, nickel, iron, titanium, tantalum, gold, platinum, silver and aluminum; the metal sheet is selected from one of iron alloy, tantalum alloy, copper alloy, aluminum alloy, nickel alloy and titanium alloy.

6. The manufacturing method according to any one of claims 1-5, characterized in that, The method for preparing the optical fiber blank includes the following steps: (1) The cladding glass tube and the core glass rod are coaxially nested together to form an optical fiber preform; the optical fiber preform is vertically placed in a vacuum heating furnace, and the cladding glass tube and the core glass rod are bonded together by a vacuum heating process; (2) The bonded optical fiber preform is fed into the drawing equipment and drawn to obtain an optical fiber monofilament; multiple optical fiber monofilaments are arranged to form a primary multifilament rod, and the primary multifilament rod is placed in the drawing equipment for further drawing to obtain a primary multifilament. (3) Place the primary multifilament in the arranging mold and arrange it according to the preset structure; bind and fix the arranged primary multifilament, then put the bound and fixed primary multifilament into the hot pressing mold, and then put the hot pressing mold containing the primary multifilament into the vacuum hot pressing furnace for melting and pressing operation. After the melting and pressing process in the vacuum hot pressing furnace is completed, the optical fiber blank to be processed is obtained. (4) Perform gradient annealing on the fiber optic blank to be processed; continuously monitor the temperature inside the furnace until it drops to room temperature, and then remove the annealed fiber optic blank from the furnace. (5) The annealed fiber blank is subjected to cold working to obtain the fiber blank.

7. The manufacturing method according to claim 6, characterized in that, Both the outer glass tube and the core glass rod are special glass materials with high transparency and low absorption. The transparency is ≥85% transmittance in the visible light band or at a specific laser wavelength; the linear absorption coefficient for the target laser wavelength is ≤0.1cm. -1 ; The fracture toughness of the aforementioned glass tube and core glass rod is ≥0.7 MPa*m. 1 / 2 ; The single fiber obtained in step (2) is adjusted according to the size of the desired fiber microchannel, and the fiber single fiber is arranged and drawn ≥1 time; The material of the aforementioned corrugated glass tube is a special glass material that is resistant to acid and alkali corrosion and has a glass transition temperature between 500℃ and 800℃. The core glass rod is made of an acid-soluble special glass material with a glass transition temperature between 500℃ and 800℃. The glass transition temperature difference between the skin glass and the core glass of the optical fiber preform is ≤50℃, the percentage difference in the coefficient of thermal expansion is less than or equal to 20%, and the drawing temperature of the skin glass and the core glass is between 550-900℃.

8. The manufacturing method according to claim 7, characterized in that, The melting and pressing operation includes: Evacuate the vacuum hot press furnace to a vacuum level of less than 50 Pa, and raise the temperature at a rate of 0.5-8℃ / min. First, raise the temperature to 400-600℃ and hold for 20-180 minutes, then continue to raise the temperature to 500-800℃ and hold for 1-5 hours, and finally raise the temperature to 500-900℃ and hold for 1-5 hours. Then start the press to apply pressure to the hot press mold, and control the compression ratio at 0.75-0.

99. The gradient annealing process includes: after hot pressing, the optical fiber blank to be processed is kept at 500-900℃ for 1.5-2.5h, then cooled to 250-350℃ at a rate of 1-2℃ / min, then kept at that temperature for 20-40 minutes, and then allowed to cool naturally to room temperature.

9. A fiber-optic anisotropic microchannel glass-based atomizing core, characterized in that, It is prepared according to the preparation method of any one of claims 1-8.

10. The application of the optical fiber anisotropic microchannel glass-based atomizing core as described in claim 9 in electronic cigarettes, medical atomizers, flavoring atomizing devices, and health atomizing devices.

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