An optical fiber coupled cluster output laser ablation power device

Abstract

The fiber-coupled beam-output laser ablation power device disclosed by the present invention includes a fiber-coupled beam-output laser module, a belt-type working medium supply module, and a control module. The fiber-coupled beam-output laser module is used to generate a laser beam spot. The belt-type working medium supply module supplies a belt-type working medium to the laser beam spot, and the laser beam spot ablates along the length direction of the belt-type working medium. The control module is used to drive the diode laser to emit laser and control the speed of the belt-type working medium supplied by the supply module, that is, the moving speed in the length direction of the belt-type working medium. The laser ablates the belt-type working medium to generate plasma, providing power for the attitude and orbit control of microsatellites. The present invention reduces the complexity of the laser ablation power device, increases the utilization rate of the belt-type working medium, improves the working medium storage capacity and increases the available amount of the working medium, improves the total impulse of the propulsion system, and realizes the low power consumption, small volume, standardization, modularization, and high integration of the laser ablation power device.

Description

Technical Field

[0001] The present invention relates to the technical field of micro-nano satellite thrust, and specifically, to an optical fiber coupled cluster output laser ablation power device for use in the laser ablation propulsion of micro-nano satellites. Background Art

[0002] Due to their small size, light weight, low cost, high functional density, short development cycle and other characteristics, micro-nano satellites have become a new hotspot in the development of satellite technology. Micro-nano satellites are usually composed of standard 1U unit systems. The volume of 1U is 100mm×100mm×100mm. For example, for a 6U micro-nano satellite, it is generally composed of 1U unit systems in a 2-row and 3-column combination, that is, the volume is 300mm×200mm×100mm. As an important part of the micro-nano satellite system, a micro-thruster can provide necessary power support for the attitude and orbit adjustment of the micro-nano satellite, and improve the mission execution ability and on-orbit service life of the micro-nano satellite. Since the micro-propulsion technology involves many cross-cutting technologies such as opto-mechatronics and the system is relatively complex, there is currently no low-power, small-volume micro-nano satellite power device that can be used in actual engineering and is mature and standardized, which also restricts the further development of micro-nano satellite technology.

[0003] In recent years, due to its high specific impulse characteristics, the electric propulsion technology has gradually become the main research direction of the micro-nano satellite power system. Among them, the laser ablation power device that converts electrical energy into light energy and then converts light energy into mechanical energy has become one of the optional power system technologies for micro-nano satellites, which can meet the requirements of the micro-nano satellite power system. The idea of using laser to generate power as a micro-thruster has a long history, and relevant technical research has been carried out both at home and abroad. Research teams in the field of laser application technology in the United States, Japan, Germany and other countries have developed different types of laser power devices, and verified the technical feasibility of the laser power device to generate impulse and form thrust. For example, the German Aerospace Center developed a laser ablation micro-thruster that ablates solid materials with a nanosecond pulse width. The solid material is supplied by pushing with a constant force spring, and the laser ablates the working medium material in an inclined reflection manner at an angle of 45 degrees; Japan proposed a laser ablation micro-thruster with a pre-set ablation pit, in which the ablated working medium is filled into the pre-set ablation pit for constrained ablation. Although the principle of the laser ablation micro-thruster has been verified, the micro-thrusters that meet the requirements of low power consumption, small volume and high integration for micro-nano satellites are not yet mature enough. For example, some have a large volume and some have special-shaped structures, so it is difficult to apply them to the standardized micro-nano satellite power system.

[0004] In addition, the level of laser power density and the efficient ablation of the working medium are crucial for improving the specific impulse of the laser ablation power device. This requires the laser of the laser ablation power device to have good focusing performance and a dense beam bundling method. The existing method is to use a single or multiple lenses to achieve the focusing of the laser beam. However, the application of lenses not only increases the difficulty of optical path debugging but also brings system complexity. At the same time, in order to achieve the efficient ablation of the belt-type solid working medium, a single lens must be able to reciprocate in a certain dimension, which inevitably requires adding motion execution mechanisms such as motors and guide rails, increasing the additional power of the thruster. There are also existing technical methods that use a combination of multiple lenses to achieve the efficient ablation of the working medium, which also brings an increase in system volume and the complexity of debugging. Summary of the Invention

[0005] In view of this, the invention aims to: one is to reduce the complexity of the laser ablation power device, and the other is to reduce the volume of the laser ablation power device, so as to achieve low power consumption, small volume, standardization, modularization, and high integration of the laser ablation power device, and solve the problems in the background technology.

[0006] To achieve the above object, the present invention provides a fiber-coupled beam output laser ablation power device, including a fiber-coupled beam output laser module, a belt-type working medium supply module, and a control module; wherein,

[0007] The fiber-coupled beam output laser module includes multiple diode lasers, optical fibers, glass sheets, and a fiber beam box. Each diode laser is connected to the input end of the optical fiber and outputs laser through the optical fiber. A glass sheet is provided between the output end of the optical fiber and the belt-type working medium. The fiber beam box fixes the output ends of all optical fibers and the glass sheet, and makes the laser focusing spots output by multiple optical fibers form a laser beam spot. The laser beam spot acts on the belt-type working medium moving along the length direction, causing the belt-type working medium to be ablated to generate plasma that provides power.

[0008] The belt-type working medium supply module provides a belt-type working medium at the laser beam spot of the fiber-coupled beam output laser module.

[0009] The control module is used to drive the diode lasers to emit laser and control the speed of the belt-type working medium supply module to supply the belt-type working medium.

[0010] Further, the glass sheet is an antireflection glass sheet, and both sides of the antireflection glass sheet are coated with an antireflection film with the same wavelength as the diode laser.

[0011] Further, the material of the glass sheet is quartz glass.

[0012] Further, the optical fiber beam box includes a substrate, which is a single-piece structure or an upper and lower combined structure. When the substrate is a single-piece structure, a through hole for accommodating the optical fiber output end is provided inside the substrate, or a through groove for accommodating the optical fiber is provided on the substrate. When the substrate is an upper and lower combined structure, the substrate includes an upper substrate and a lower substrate stacked up and down. A through groove for accommodating the optical fiber output end is provided on the opposite surfaces of the upper and lower substrates, or a through groove for accommodating the optical fiber output end is provided on the upper surface of the lower substrate or only on the lower surface of the upper substrate. The optical fiber is fixed in the through groove or through hole of the substrate.

[0013] Further, the optical fiber beam box further includes a beam housing with a through groove, and the substrate with the optical fiber output end fixed and the glass sheet are fixed in the through groove of the beam housing.

[0014] Further, the laser beam spot is in a shape of a straight line, or an array rectangle or array square composed of m×n optical fibers, where m and n are natural numbers satisfying m×n≥2.

[0015] Further, the belt-type working medium supply module includes a driving motor, a transmission mechanism, a driving winch and a driven winch. The belt-type working medium is pre-wound on the driven winch, the leading end of the belt-type working medium is wound around the driving winch, and the driving motor rotates to drive the driving winch to rotate through the transmission mechanism, thereby driving the belt-type working medium to move along the length direction.

[0016] Further, the transmission mechanism adopts a gear transmission mechanism.

[0017] Further, the gear transmission mechanism is a bevel gear transmission or a worm and worm gear transmission. A driving wheel or a worm is installed on the motor shaft, a driven wheel or a worm wheel is installed on the driving winch, and the motor shaft is perpendicular to the driving winch shaft.

[0018] Further, the fiber-coupled beam output laser ablation power device adopts a three-layer square column structure, which is the top layer, the middle layer and the bottom layer from top to bottom. Among them,

[0019] On the top layer, a control module is provided, and the control module is connected to the driving motor and the diode laser through a power supply cable and a communication cable.

[0020] On the middle layer, a motor mounting bracket and multiple diode lasers of the fiber-coupled beam output laser module are provided. The driving motor is fixed on the middle layer through the motor mounting bracket, and the diode lasers are arranged in sequence around the driving motor and close to the side surface of the middle layer.

[0021] At the bottom layer, there are a driving motor of the belt-type working medium supply module, a transmission mechanism, a driving winch, a driven winch, a belt-type working medium, a first guide wheel, a second guide wheel, a nozzle, and an optical fiber beam combiner box of the optical fiber coupled beam output laser module; the driving winch and the driven winch are respectively arranged at two diagonals of the bottom layer, the belt-type working medium is in a long strip shape, and both ends are fixedly connected to the rotating shafts of the driving winch and the driven winch respectively, and the driven winch is pre-wound with the belt-type working medium; the driving motor is arranged on the right side of the connection line of the rotating shafts of the driving winch and the driven winch, the transmission mechanism is arranged between the driving motor and the driving winch, the rotating shaft of the driving motor and the rotating shaft of the driving winch are placed perpendicular to each other at 90 degrees, the driving motor drives the driving winch to rotate around the central axis through the transmission mechanism, and when the driving winch rotates, the belt-type working medium is wound onto the rotating shaft of the driving winch; a nozzle is opened on the left side of the connection line of the rotating shafts of the driving winch and the driven winch and on the side surface of the bottom layer; the first guide wheel and the second guide wheel are arranged on both sides of the nozzle, the belt-type working medium winds around the first guide wheel and the second guide wheel and passes through the inner side of the nozzle, and the optical fiber beam combiner box is placed between the first guide wheel and the second guide wheel, inside the belt-type working medium and there is a gap between the optical fiber beam combiner box and the belt-type working medium.

[0022] The beneficial effects of the present invention include:

[0023] 1. For the fiber-coupled beam output laser ablation power device of the present invention, by adopting the mode of diode lasers and optical fiber beam combination, the use of single or multiple lenses is avoided, the complexity of the laser ablation microthruster is reduced, the dead weight of the laser ablation microthruster is reduced, and the volume of the laser ablation microthruster is reduced, thereby realizing the low power consumption, small volume, standardization, modularization and high integration of the laser ablation power device.

[0024] 2. For the fiber-coupled beam output laser ablation power device of the present invention, by outputting laser through fiber coupling and beam combination and cooperating with the transmission of the belt-type working medium, the utilization rate of the belt-type working medium can be increased, and the total impulse of the propulsion system can be greatly improved.

[0025] 3. The fiber-coupled beam output laser ablation power device provided by the present invention adopts a winch-type belt-type working medium transmission mode, has a high integration degree, improves the working medium storage capacity and increases the available amount of the working medium. Description of the Drawings

[0026] Figure 1 It is a three-dimensional perspective view of the fiber-coupled beam output laser ablation power device in the embodiment of the present invention.

[0027] Figure 2 It is a schematic structural diagram of the fiber-coupled beam output laser module in the embodiment of the present invention.

[0028] Figure 3 It is a schematic diagram of an optical fiber connecting a diode laser in the embodiment of the present invention.

[0029] Figure 4 This is a schematic structural diagram of the belt-type working fluid supply module in the embodiments of the present invention.

[0030] Figure 5 This is a schematic diagram of the ablation of the belt-type working fluid at the optical fiber cable duct bank in the embodiments of the present invention.

[0031] Figure 6 This is a schematic structural diagram of the optical fiber cable bundle of the present invention in a grooved substrate. Detailed implementation manners

[0032] The following further describes in detail the implementation manners of the present invention in conjunction with the accompanying drawings and embodiments. The following embodiments are used to illustrate the present invention, but cannot be used to limit the scope of the present invention.

[0033] In the description of the embodiments of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the accompanying drawings. It is only for the convenience of describing the embodiments of the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus cannot be understood as a limitation to the embodiments of the present invention. In addition, the terms "first", "second", and "third" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0034] In the description of the embodiments of the present invention, it should be noted that unless otherwise clearly defined and limited, the terms "connected" and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected or indirectly connected through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present invention can be understood according to specific situations.

[0035] In the embodiments of the present invention, unless otherwise clearly defined and limited, the first feature being "above" or "below" the second feature can be that the first and second features are in direct contact, or the first and second features are indirectly in contact through an intermediate medium. Moreover, the first feature being "above", "over" and "on" the second feature can be that the first feature is directly above or obliquely above the second feature, or simply means that the first feature has a higher horizontal height than the second feature. The first feature being "below", "beneath" and "under" the second feature can be that the first feature is directly below or obliquely below the second feature, or simply means that the first feature has a lower horizontal height than the second feature.

[0036] In the description of this specification, the descriptions referring to terms such as "one embodiment", "some embodiments", "example", "specific example", or "some examples", etc. mean that the specific features, structures, materials, or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the embodiments of the present invention. In this specification, the schematic expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments or examples. In addition, without contradiction, those skilled in the art can combine and combine the different embodiments or examples described in this specification and the features of different embodiments or examples.

[0037] The present invention discloses a fiber-coupled beam output laser ablation power device. The device of the present invention uses a diode laser to emit laser light, which is output in a fiber-coupled beam to achieve a beam arrangement of ablation spots on a strip-shaped target tape (preferably in a linear arrangement, or it can also be a square, rectangular or other array patterns). The ablation of the belt-shaped working medium generates plasma, thereby generating a recoil thrust. The present invention reduces the complexity of the laser ablation power device, increases the utilization rate of the belt-shaped working medium, improves the working medium storage capacity and increases the available amount of the working medium, improves the total impulse of the propulsion system, and realizes the low power consumption, small volume, standardization, modularization and high integration of the laser ablation power device.

[0038] The device of the present invention includes a fiber-coupled beam output laser module, a belt-shaped working medium supply module and a control module. The fiber-coupled beam output laser module is used to generate a laser beam spot formed by a plurality of laser focused spots. The belt-shaped working medium supply module supplies the belt-shaped working medium to the laser beam spot. The laser beam spot ablates along the length direction of the belt-shaped working medium. The control module is used to drive the diode laser to emit laser light and control the speed of the belt-shaped working medium supplied by the supply module, that is, the moving speed in the length direction of the belt-shaped working medium. The laser ablation of the belt-shaped working medium generates plasma to provide power for the attitude and orbit control of the microsatellite. A glass sheet is arranged between the fiber output end and the belt-shaped working medium. The glass sheet is used to prevent the jet material generated during the ablation process from contaminating the core diameter of the optical fiber. Preferably, the glass sheet is an antireflection glass sheet, and both sides of the antireflection glass sheet are coated with an antireflection film having the same wavelength as the diode laser. Using the antireflection glass sheet not only prevents the jet material from contaminating the core diameter of the optical fiber, but also increases the transmittance of the laser light with a specific wavelength emitted by the diode laser, filtering out some light of other wavelengths to make the laser light passing through the antireflection glass sheet purer.

[0039] Furthermore, in some embodiments of the present invention, the fiber-coupled beam-output laser module includes multiple diode lasers, optical fibers and a fiber-optic bundle box, each diode laser is connected to an optical fiber input end and outputs laser through the optical fiber, the fiber-optic bundle box fixes the output ends of all optical fibers, and focuses the lasers output by multiple optical fibers to form a laser beam spot, and the laser beam spot acts on a belt-type working fluid moving along the length direction, causing the belt-type working fluid to ablate and generate plasma that provides power.

[0040] The optical fiber cluster box includes a substrate, which is a single-body structure or a top-bottom combined structure; when the substrate is a single-body structure, a through hole for accommodating the optical fiber output end is provided inside the substrate, or a through groove for accommodating the optical fiber is provided on the substrate; when the substrate is a top-bottom combined structure, the substrate includes an upper substrate and a lower substrate stacked up and down, and a through groove for accommodating the optical fiber output end is provided on the opposite surfaces of the upper and lower substrates, or a through groove for accommodating the optical fiber output end is provided on the upper surface of the lower substrate or only on the lower surface of the upper substrate; the optical fiber is fixed in the through groove or through hole. Preferably, the optical fiber cluster box also includes a cluster shell, which is provided with a through groove, and the substrate and glass sheet with the optical fiber output end fixed are fixed in the through groove.

[0041] Furthermore, in some embodiments of the present invention, the belt-type working fluid supply module includes a driving motor, a transmission mechanism, an active capstan and a driven capstan; the belt-type working fluid is pre-wound on the driven capstan, and the belt head of the belt-type working fluid is wound on the active capstan, and the driving motor rotates through the transmission mechanism to drive the active capstan to rotate, thereby driving the belt-type working fluid to move along the length direction. In some embodiments of the present invention, the belt-type working fluid includes a transparent base layer and a propulsion working fluid layer, the transparent base layer is placed on the side close to the output end of the optical fiber, and the propulsion working fluid layer is placed on the side away from the output end of the optical fiber. On the one hand, the transparent base layer serves as a conveyor belt for the propulsion working fluid, and on the other hand, it also serves to prevent the ejected material generated during the ablation process from contaminating the core diameter of the optical fiber.

[0042] Preferably, a stepper motor is selected as the driving motor, so that the working process of the fiber-coupled beam output laser ablation power device in the above embodiment of the present invention is as follows: the control module receives external power supply and starts to drive the diode laser to work after receiving the working instruction, and emits laser to ablate the belt-type working fluid through the fiber-coupled beam output, thereby completing a complete ablation in the length direction of the belt-type working fluid and generating a pulse impulse output. According to the ablation time or the feedback of the completion of ablation, the motor driving circuit in the control module drives the motor to work, and the working fluid belt is transmitted along the length direction of the working fluid belt through the components of the belt-type working fluid supply module, so that the belt-type working fluid is wound from the driven winch to the active winch, and a new belt-type working fluid is provided to the laser beam spot for the next ablation. The fiber-coupled beam output laser ablation power device continuously works at a certain working frequency, forming a pulse impulse output of a certain frequency, and generating an average thrust.

[0043] As shown in Figure 1 the figure, the fiber-coupled beam output laser ablation power device provided by this embodiment includes, from top to bottom, a control module 100, a fiber-coupled beam output laser module 200, and a belt-type working medium supply module 300. Their volume and mass distribution are shown in Table 1.

[0044] Table 1

[0045]

[0046] As can be seen from the above table, the fiber-coupled beam output laser ablation power device in this embodiment has three layers. Each layer interface is square, with a size of 100 mm × 100 mm. After the integration of each module, the structural size is 100 mm × 100 mm × 50 mm. The control module 100 is on the top layer, with a size of 100 mm × 100 mm × 17 mm and a mass of 50 - 100 g. The main body of the fiber-coupled beam output laser module 200 is in the middle layer, with a size of 100 mm × 100 mm × 20 mm and a mass of 100 - 150 g. The main body of the belt-type working medium supply module 300 is on the bottom layer, with a size of 100 mm × 100 mm × 13 mm and a mass of 150 - 250 g. The total mass of the fiber-coupled beam output laser ablation power device is 300 - 500 g.

[0047] The present invention uses a diode laser and fiber-coupled beam output laser, avoiding the space occupied by lenses, thus realizing a fiber-coupled beam output laser ablation power device with small size, high integration, and low energy consumption in this embodiment. Its mass is less than 0.5 kg, power consumption is less than 5 W, and specific impulse is greater than 500 s, which can provide power for the orbit adjustment and attitude control of microsatellites in orbit flight, meeting the actual application requirements of microsatellite attitude and orbit control engineering.

[0048] As shown in Figure 2 the figure, in the middle layer of the fiber-coupled beam output laser ablation power device of this embodiment, there are multiple diode lasers 210 and motor mounting brackets 230 of the fiber-coupled beam output laser module 200. The driving motor 220 is fixed on the middle layer through the motor mounting bracket 230, and 8 diode lasers are arranged around the driving motor 220 and closely attached to the side of the middle layer in sequence.

[0049] Preferably, the fiber-coupled bundled output laser module uses 8 diode lasers. The 8 diode lasers are output in a fiber-bundled manner, with an arrangement pitch of 714 μm. To ensure the consistency of the laser output by the laser diodes, the 8 diode lasers are connected in series. These 8 diode lasers couple and output the laser through the FC interface at the tail. The maximum output power of a single diode laser is 10 W, the wavelength is 940 nm, the core diameter of the output fiber is 105 μm, the numerical aperture is 0.22, the power density of the focused spot is above 105 W / cm2, and it can operate in pulse mode with a pulse width of 100 μs to 5 ms and a maximum frequency set to 100 Hz. Specifically, as Figure 3 shown.

[0050] As Figure 4 , Figure 5 shown, at the bottom layer of the fiber-coupled bundled output laser ablation power device in this embodiment, there are provided a driving motor 220 of the belt-type working medium supply module 300, a motor bevel gear 240, a driving winch 320, a bevel gear 310 of the driving winch, a driven winch 330, a belt-type working medium 340, a first guide wheel 361, a second guide wheel 362, a nozzle 370, and a fiber bundle box 350 of the fiber-coupled bundled output laser module 200; the driving winch 320 and the driven winch 330 are respectively arranged at two diagonals of the bottom layer. The belt-type working medium 340 is in a long strip shape, and both ends are fixedly connected to the rotating shafts of the driving winch 320 and the driven winch 330. The driven winch 320 pre-winds the belt-type working medium 340; the driving motor 220 is arranged on the right side of the connection line of the rotating shafts of the driving winch 320 and the driven winch 330. A motor bevel gear 240 is installed on the rotating shaft of the driving motor 220. The motor bevel gear 240 meshes with the bevel gear 310 of the driving winch, and the two are placed perpendicular to each other at 90 degrees, driving the driving winch to rotate around the central axis. When the driving winch 320 rotates, the belt-type working medium is wound onto the rotating shaft of the driving winch. In some other embodiments of the present invention, the bevel gear transmission method in this embodiment can be replaced by other methods with the same function such as worm and worm gear transmission; on the left side of the connection line of the rotating shafts of the driving winch 320 and the driven winch 330, a nozzle 370 is opened on the side of the bottom layer; the first guide wheel 361 and the second guide wheel 362 are arranged on both sides of the nozzle 370. The belt-type working medium 340 winds around the first guide wheel 361 and the second guide wheel 362 and passes through the inner side of the nozzle 370. The fiber bundle box 350 is placed between the two guide wheels 361 and 362, inside the belt-type working medium 340 and at a certain distance from the belt-type working medium 340. The laser beam spot emitted by the fiber bundle box 350 passes through the transparent base layer of the belt-type working medium 340 and acts on the propellant layer. The plume 380 generated by ablating the propellant is ejected through the nozzle 370.

[0051] In some embodiments of the present invention, the laser beam spot is in a linear shape, or an array rectangle or array square composed of m×n optical fibers, where m and n are natural numbers, and it can also be other linear or planar shapes. In this preferred embodiment, to ensure the ablation efficiency, the utilization rate of the working medium, and reduce the volume of the optical fiber beam combiner, the laser beam spot is in a linear shape and forms an angle with the length direction of the belt-shaped working medium, preferably a right angle, that is, the laser beam spot is perpendicular to the length direction of the belt-shaped working medium.

[0052] Preferably, the belt-shaped working medium includes a transparent base layer and a propellant layer. The propellant layer is on the transparent base layer, and the incident laser penetrates the transparent base layer to ablate the propellant layer; the material of the propellant layer is selected from energetic materials with a thickness of 50 - 150 μm; the material of the transparent base layer is selected from polyethylene terephthalate with a thickness of 150 - 200 μm; the width of the belt-shaped working medium is 6 mm. The propellant is applied by spraying and evenly coated on the transparent base layer.

[0053] As Figure 5 , Figure 6 As shown in the figure, the optical fiber beam combiner 350 bundles the laser emitted by the 8 diode laser arrays 210 through optical fibers. The optical fiber beam combiner 350 includes a grooved substrate 352 and a beam combining housing 354. The number of optical fibers 351 is the same as the number of grooves on the grooved substrate 352. Preferably, the interface of the groove is a square groove; the output ends of the optical fibers 351 are installed in the grooves of the substrate 352 and are fixed by filling with solid glue to ensure strength and reliability; the end connections of the output ends of the optical fibers 351 are parallel to the end face of the grooved substrate 352; the input ends of the optical fibers are connected to the diode laser array 210 through FC interfaces; the antireflection glass sheet 353 is installed in front of the end face of the grooved substrate 352; the substrate 352 with the optical fibers 351 fixed and the antireflection glass sheet are fixed in the beam combining housing 354; through the above structural settings, the optical fiber beam combiner 350 forms a laser beam spot from the laser beam spots at the output ends of multiple optical fibers and acts on the belt-shaped working medium for ablation.

[0054] The optical fiber coupled beam output laser module includes a diode laser, an optical fiber, two upper and lower substrates with square grooves, an antireflection glass sheet, and a metal mounting housing. The number of the diode lasers and optical fibers is the same as the number of square grooves on the substrate with square grooves; the optical fiber is installed on the substrate with square grooves; the output end of the optical fiber is flush with the end face of the substrate with square small grooves; the input end of the optical fiber is connected to the diode laser through an FC interface; the antireflection glass sheet is installed in front of the end face of the substrate with square small grooves; the metal mounting housing is used to fix the substrate, optical fiber, and antireflection glass sheet; the target belt is ablated under the action of the laser beam emitted by the optical fiber beam combination.

[0055] Among them, the fiber optic output ends are parallel to each other and have equal intervals. The ends of the fiber optic output ends are on a straight line, and the interval between the fiber optic output ends is p. Among them, w is the width of the belt working medium, and n is the number of optical fibers. The fiber optic bundle composed of multiple optical fibers fixed in the substrate, the glass sheet, and the belt working medium are arranged in sequence. Among them, the distance between the output end of the fiber optic bundle and the glass sheet is L1, and usually L1 ≤ 5 mm; the distance between the glass sheet and the solid working medium belt is L2, where In the formula, D is the size of the ablation spot on the target belt; d is the core diameter of the optical fiber; θ1 is the divergence angle of a single optical fiber; θ2 is m is the refractive index of the glass sheet, and L is the thickness of the glass sheet. From the above analysis and Figure 5 It can be seen that for the same spot size, in the scheme of setting the antireflection glass sheet, the refraction of the antireflection glass sheet shortens the distance between the fiber optic output end and the solid working medium target belt, which is beneficial to simplifying the structural design and reducing the volume of the entire device.

[0056] In the fiber optic coupled bundle output laser ablation power device of this embodiment, the control and power supply are realized by the control module 100, including a motor drive circuit and a diode laser drive circuit. The motor drive circuit is used to control the working medium transfer motor of the working medium supply module and supply power to it; the laser drive circuit is used to supply power to the laser and control its light output. The control instructions include instructions such as turning on, turning off, working frequency, pulse width, and light output power of the diode laser, and the motor control instructions include instructions such as turning on, turning off, stepping angle, rotation direction, and stepping number setting of the motor.

[0057] The control module controls the drive motor to work, drives the motor bevel gear to rotate. The motor bevel gear engages and drives with the driving winch bevel gear, so that the driving winch rotates around the central axis. One end of the belt working medium is fixed to the driving winch, so that the belt working medium continuously winds from the driven winch to the driving winch. Each time the drive motor drives to a new position, the belt working medium provides a new propelling working medium to the fiber optic coupled bundle spot, so that the laser acts on the propelling working medium for ablation, generating a reaction impulse, and the fiber optic coupled bundle output laser ablation power device works continuously at a certain working frequency to form a continuous thrust.

[0058] In the fiber optic coupled bundle output laser ablation power device of this embodiment, the working process of the entire device is initiated by the control module 100 located at the top layer receiving external communication and power supply, and synchronously coordinates the work of each drive circuit. The basic process is as follows:

[0059] Step 1: The laser drive circuit in the control module 100 supplies power to the diode laser 210. The emitted laser is output through fiber optic coupling and is bundled and output at the fiber optic bundle box 350, completing a pulsed laser ablation of the current position of the belt working medium 340, generating a jet plume 380, and forming a reaction impulse;

[0060] Step 2: The motor drive circuit in the control module 100 controls the motor to rotate. Through the meshing of the motor bevel gear 240 and the driving winch bevel gear 310, the driving winch is driven to rotate, and the belt working medium of the belt-type working medium supply module 300 moves along the length direction of the belt, so as to wind the belt from the passive working medium winch 330 onto the driving winch 320;

[0061] Step 3: Repeat Steps 1 and 2 until the belt-type working medium 340 is completely wound from the driven working medium winch 330 to the driving winch 320, and the belt-type working medium 340 completes all ablation effects.

[0062] During the whole working process, by adjusting the working frequency of each step, the frequency of the pulse impulse generation can be adjusted, that is, the average thrust output by the laser ablation power device can be changed.

[0063] In summary, the fiber-coupled and bundled-output laser ablation power device of the present invention, by adopting the diode laser and fiber bundle method, avoids the use of single or multiple lenses, reduces the complexity of the laser ablation microthruster, reduces the dead weight of the laser ablation microthruster, and reduces the volume of the laser ablation microthruster.

[0064] The fiber-coupled and bundled-output laser ablation power device of the present invention outputs laser through fiber coupling and bundling, and cooperates with the transmission of the belt-type working medium, which can increase the utilization rate of the belt-type working medium and greatly improve the total impulse of the propulsion system.

[0065] The fiber-coupled and bundled-output laser ablation power device provided by the present invention adopts a winch-type belt-type working medium transmission mode, has a high integration degree, improves the working medium storage capacity and increases the available amount of the working medium.

[0066] In a specific embodiment of the present invention, through integrated optimization design, a fiber-coupled and bundled-output laser module, a belt-type working medium supply module, and a control module with a high integration degree are obtained. After overall integration, the volume can be restricted within 0.5U, the mass does not exceed 0.5 kg, and the power is less than 5W, solving the problem of standardization of the micro-nano satellite power system, and having significant beneficial effects.

[0067] The above is only a preferred embodiment of the present invention, and does not impose any form of limitation on the present invention. Although the present invention is disclosed as above with a preferred embodiment, it is not intended to limit the present invention. Any person skilled in the art, without departing from the scope of the technical solution of the present invention, makes some changes or modifications using the technical content disclosed above, which are all equivalent to equivalent implementation cases and all fall within the scope of the technical solution.

Claims

1. A fiber-optic coupled cluster output laser ablation power device, characterized in that It includes a fiber-coupled beam output laser module, a belt-type working medium supply module, and a control module; among them, The fiber-coupled beam output laser module includes a plurality of diode lasers, optical fibers, glass sheets, and a fiber beam box. Each diode laser is connected to the input end of the optical fiber and outputs laser through the optical fiber. A glass sheet is arranged between the output end of the optical fiber and the belt-type working medium. The fiber beam box fixes the output ends of all optical fibers and the glass sheet, and makes the laser focusing spots output by multiple optical fibers form a laser beam spot. The laser beam spot acts on the belt-type working medium moving along the length direction, causing ablation of the belt-type working medium to generate plasma that provides power; The belt-type working medium supply module provides the belt-type working medium at the laser beam spot of the fiber-coupled beam output laser module; The control module is used to drive the diode laser to emit laser and control the speed of the belt-type working medium supplied by the belt-type working medium supply module.

2. The fiber-coupled cluster output laser ablation power device according to claim 1, characterized in that The glass sheet is an antireflection glass sheet, and antireflection films with the same wavelength as the diode laser are coated on both sides of the antireflection glass sheet.

3. The fiber-coupled cluster-output laser ablation power device according to claim 2, characterized in that The material of the glass sheet is quartz glass.

4. The fiber-coupled cluster output laser ablation power device according to claim 1, characterized in that, The fiber beam box includes a substrate, and the substrate is a single-piece structure or an upper and lower combined structure; when the substrate is a single-piece structure, a through hole for accommodating the output end of the optical fiber is arranged inside the substrate, or a through groove for accommodating the optical fiber is arranged on the substrate; when the substrate is an upper and lower combined structure, the substrate includes an upper substrate and a lower substrate stacked up and down. Through grooves for accommodating the output ends of the optical fibers are arranged on the opposite surfaces of the upper and lower substrates, or through grooves for accommodating the output ends of the optical fibers are arranged on the upper surface of the lower substrate or only on the lower surface of the upper substrate; the optical fibers are fixed in the through grooves or through holes of the substrate.

5. The fiber-coupled cluster-output laser ablation power device according to claim 4, wherein The fiber beam box further includes a beam housing with a through groove, and the substrate and the glass sheet with the output ends of the optical fibers fixed are fixed in the through groove of the beam housing.

6. The fiber-coupled cluster-output laser ablation power device according to claim 1, wherein The laser beam spot is in a shape of a straight line, or an array rectangle or an array square composed of m×n optical fibers, where m and n are natural numbers satisfying m×n≥2.

7. The fiber-coupled cluster output laser ablation power device according to any one of claims 1-6, characterized in that, The belt-type working medium supply module includes a driving motor, a transmission mechanism, a driving winch, and a driven winch; the belt-type working medium is pre-coiled on the driven winch, and the leading end of the belt-type working medium is wound around the driving winch. The driving motor rotates to drive the driving winch to rotate through the transmission mechanism, and then drives the belt-type working medium to move along the length direction.

8. The fiber-coupled cluster-output laser ablation power device according to claim 7, characterized in that, The transmission mechanism adopts a gear transmission mechanism.

9. The fiber-coupled cluster-output laser ablation power device according to claim 8, wherein The gear transmission mechanism is a bevel gear transmission or a worm and worm gear transmission. A driving wheel or a worm is installed on the motor shaft, a driven wheel or a worm wheel is installed on the driving winch, and the motor shaft is perpendicular to the driving winch shaft.

10. The fiber optic coupled cluster output laser ablation power device according to claim 9, characterized in that, The fiber-coupled beam output laser ablation power device adopts a three-layer square column structure, which is the top layer, the middle layer, and the bottom layer from top to bottom; among them, On the top layer, a control module is arranged, and the control module is connected to the driving motor and the diode laser through a power supply cable and a communication cable; On the middle layer, a motor mounting bracket and a plurality of diode lasers of the fiber-coupled beam output laser module are arranged. The driving motor is fixed on the middle layer through the motor mounting bracket, and the diode lasers are arranged around the driving motor and closely attached to the side surface of the middle layer in sequence; At the bottom layer, there are a driving motor of the belt-type working medium supply module, a transmission mechanism, a driving winch, a driven winch, a belt-type working medium, a first guide wheel, a second guide wheel, a nozzle, and an optical fiber beam combiner box of the optical fiber coupled beam output laser module; the driving winch and the driven winch are respectively arranged at two diagonals of the bottom layer. The belt-type working medium is in the shape of a long strip, and both ends are fixedly connected to the rotating shafts of the driving winch and the driven winch. The driven winch is pre-wound with the belt-type working medium; the driving motor is arranged on the right side of the connection line of the rotating shafts of the driving winch and the driven winch, and the transmission mechanism is arranged between the driving motor and the driving winch. The rotating shaft of the driving motor and the rotating shaft of the driving winch are placed perpendicular to each other at 90 degrees. The driving motor drives the driving winch to rotate around the central axis through the transmission mechanism. When the driving winch rotates, the belt-type working medium is wound around the rotating shaft of the driving winch; a nozzle is opened on the left side of the connection line of the rotating shafts of the driving winch and the driven winch and on the side surface of the bottom layer; the first guide wheel and the second guide wheel are arranged on both sides of the nozzle. The belt-type working medium winds around the first guide wheel and the second guide wheel and passes through the inner side of the nozzle. The optical fiber beam combiner box is placed between the first guide wheel and the second guide wheel, inside the belt-type working medium, and there is a gap between the optical fiber beam combiner box and the belt-type working medium.

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