A large beam aperture high power isolator structure

Abstract

The present invention discloses a large beam aperture high power isolator structure, wherein the isolator core reflection component is detachably connected to the optical path and is located inside the optical path, the first magnet group is detachably connected to the dust cover and is located on the top of the dust cover, the second magnet group is detachably connected to the second accommodation and is located below the first accommodation cavity, and the isolator core reflection component and the optical path form a Faraday rotator optical path Z-type refractive structure, which reduces the volume of the TGG optical rotation crystal and saves costs. With the magnet group, the minimum magnets produce the strongest and most uniform magnetic field, saving magnet materials. The magnet group is assembled in an upper and lower array, and the fixed structure is firm, stable and reliable. The magnetic field is guided by a magnetic conductor to optimize the magnetic field distribution. The structural space is reasonably utilized, and the magnetic field weakening and demagnetization phenomenon will not occur due to high temperature, thereby improving the stability of the isolator. The designed core structure scheme is conducive to the assembly of optical components, is stable and reliable, and can effectively dissipate heat and control temperature.

Description

Technical Field

[0001] The invention relates to the field of optical technology, and in particular to a large-beam-aperture high-power isolator structure. Background Art

[0002] In the optical transmission system, the reverse transmission light caused by the end face of the optical component to varying degrees will cause the operation of laser devices to be unstable, greatly shorten the life of the device, and even cause permanent damage to it. In order to avoid the influence of reverse light on the device, optical isolators are often inserted in the optical transmission system. In recent years, the development of high-power fiber lasers and their wide expansion in industrial marking, welding, cutting and other applications have put forward higher requirements for high-power optical isolators, a key component. With the continuous increase in power requirements, the laser beam itself will become thicker, so large beam aperture high-power optical isolation is an important direction for future development. Another key in the design of high-power optical isolators is the design and selection of magnetic fields and magnets. Existing high-power isolators have problems with unstable magnetic fields and poor heat dissipation. Summary of the invention

[0003] The purpose of the present invention is to provide a large beam aperture high power isolator structure, aiming to solve the technical problems of unstable magnetic field and poor heat dissipation in the high power isolator in the prior art.

[0004] To achieve the above-mentioned purpose, the present invention adopts a large-beam-aperture high-power isolator structure, including a high-power isolator, a beam expander lens, and a collimator assembly. The beam expander lens is detachably connected to the high-power isolator and is located at one end of the high-power isolator. The collimator assembly is detachably connected to the high-power isolator and is located at the other end of the high-power isolator. The high-power isolator includes a shell, a first adjusting bolt, a magnet sleeve, a first magnet group, a first aperture, a dust cover, an isolator core reflection assembly, a second magnet group, and a second adjusting bolt. The shell has a first accommodating cavity and a second accommodating cavity. The first accommodating cavity is located above the second accommodating cavity. The bottom of the first accommodating cavity has an optical path, and both ends of the optical path pass through the shell. The optical path assembly is detachably connected to the first accommodating cavity and is located at the bottom of the first accommodating cavity. The first aperture It is detachably connected to the left end of the optical path and is located on the left side of the isolator core reflection component and is communicated with the beam expander lens. The isolator core reflection component is detachably connected to the optical path and is located inside the optical path. The dust cover is detachably connected to the isolator core reflection component and is located above the isolator core reflection component. The first magnet group is detachably connected to the dust cover and is located on the top of the dust cover. The magnet sleeve is detachably connected to the dust cover and is located on the top of the dust cover and is sleeved on the first magnet group. The first adjusting bolt is detachably connected to the magnet sleeve and is located above the first magnet group. The second magnet group is detachably connected to the second accommodating cavity and is located below the first accommodating cavity. The second adjusting bolt is detachably connected to the second magnet group and is located at the bottom of the second magnet group.

[0005] Wherein, the inner core reflection component of the isolator comprises two first magnetic conductors, two reflector supports, two polarization beam splitters, two reflective lenses and two optical rotation crystals, the two first magnetic conductors are respectively detachably connected to the optical path and are respectively located on both sides of the optical path, the two reflector supports are respectively detachably connected to the corresponding first magnetic conductors and are respectively located on the side faces of the corresponding first magnetic conductors, the two reflective lenses are respectively detachably connected to the corresponding reflector supports and are respectively located on the side faces of the corresponding reflector supports, and the two reflective lenses are arranged in a Z shape, the two ends of the optical rotation crystal are respectively detachably connected to the two reflective lenses and are located between the two reflective lenses, the two polarization beam splitters are respectively detachably connected to the optical path and are located on the side faces of the corresponding optical rotation crystals, and the two optical rotation crystals are located between the two polarization beam splitters, and the other optical rotation crystal is detachably connected to the optical path and is located at the bottom of the corresponding first magnetic conductor.

[0006] Among them, the collimator assembly includes a flange, a second aperture, an adjustment seat and a collimator body, the left end of the flange is detachably connected to the shell and is located at the end of the shell away from the beam expander lens, the second aperture is detachably connected to the flange and is located at the right end of the flange, the adjustment seat is detachably connected to the second aperture and is located on the right side of the second aperture, the collimator body is detachably connected to the adjustment seat and is located on the right side of the collimator body, and the large beam aperture high power isolator structure also includes a tail sleeve, the tail sleeve is detachably connected to the shell and is located at the end of the shell away from the beam expander lens, and is sleeved on the outer surface of the collimator assembly.

[0007] Among them, the shell has a cylinder at one end away from the collimator assembly, and the cylinder is connected to the optical path. The beam expander lens includes a lens slider, a biconcave lens, a telescopic lens sleeve, a plano-convex lens, a lens pressure ring and a steel sleeve. The right end of the lens slider is detachably connected to the interior of the cylinder and is located on the left side of the first aperture. The biconcave lens is detachably connected to the lens slider and is located at the left end of the lens slider. The telescopic lens sleeve is slidably connected to the cylinder and is located at the left end of the biconcave lens and is sleeved on the interior of the cylinder. The plano-convex lens is detachably connected to the telescopic lens sleeve and is located at the left end of the telescopic lens sleeve. The lens pressure ring is detachably connected to the plano-convex lens and is located at the left end of the plano-convex lens. The steel sleeve is detachably connected to the cylinder and is sleeved on the outer surface of the cylinder.

[0008] Among them, the large beam aperture high power isolator structure also includes a cover and a magnet end cover, the cover is detachably connected to the first accommodating cavity and is located above the first adjusting bolt, and the magnet end cover is detachably connected to the second accommodating cavity and is located below the second adjusting bolt.

[0009] Wherein, the first magnet group and the second magnet group both include a magnet and a second magnetic conductor, the second magnetic conductor is detachably connected to the magnet and is located at an end of the magnet away from the optical path, and the magnet has three magnet bodies.

[0010] Wherein, the large beam aperture high power isolator junction also includes a third aperture, which is detachably connected to the magnet sleeve and is located above the optical path and on a side of the first accommodating cavity close to the flange.

[0011] The beneficial effects of the present invention are as follows: the inner core reflection component of the isolator and the optical path form a Faraday rotator optical path refraction structure, the Z-folded optical path reduces the volume of the TGG optical rotation crystal, and the composite utilization of the crystal is achieved through such optical path folding, which ultimately saves costs. At the same time, it saves magnetic materials, improves magnetic field distribution, improves isolation, improves heat dissipation, reduces thermally induced birefringence and thermal lens effects to a certain extent, and the folded optical path significantly reduces costs. The first magnet group and the second magnet group are used to generate the strongest and most uniform magnetic field with the least magnets, saving magnet materials. The upper and lower arrays of the magnet group are assembled, the fixed structure is firm, stable and reliable, the magnetic field is guided by the magnetic conductor, the magnetic field distribution is optimized, the structural space is reasonably utilized, and the magnetic field will not be weakened and demagnetized due to high temperature, thereby improving the stability of the isolator. And the distance between the upper and lower magnet group arrays can be adjusted to change the magnetic field, thereby realizing the adjustable rotation angle of the TGG optical rotation crystal. The large beam aperture high-power isolator formed by connecting the beam expander lens and the high-power isolator together is easy to mass produce, has high overall matching accuracy, stable and reliable structure, and is practical and beautiful. The distance between the biconcave lens and the plano-convex lens can be adjusted, which is convenient for adjusting the light spot size at the light output end, and the assembly is simple and easy. The designed core structure is conducive to the assembly of optical components, stable and reliable, and can effectively dissipate heat and control temperature. The incident light angle of the collimator can be set arbitrarily, which is convenient for adjustment. The installed third aperture can avoid the influence of reverse light on the device and improve the isolation. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0013] Figure 1 It is a cross-sectional axial view of the large beam aperture high power optical isolator structure of the present invention.

[0014] Figure 2 is an exploded view of the high power isolator of the present invention.

[0015] Figure 3 It is an exploded view of the beam expander lens of the present invention.

[0016] Figure 4 It is a schematic diagram of the structure of the isolator core reflection component of the present invention.

[0017] Figure 5 It is a schematic structural diagram of the first magnet group of the present invention.

[0018] Figure 6 It is a schematic structural diagram of the magnet of the present invention.

[0019] Figure 7 It is a partial structural schematic diagram of the collimator assembly of the present invention.

[0020] High power isolator, 2- beam expansion lens, 3- collimator assembly, 4- first accommodating cavity, 5- second accommodating cavity, 6- tail sleeve, 7- cylinder, 8- cover, 9- magnet end cap, 10- third aperture, 11- shell, 12- first adjustment bolt, 13- magnet sleeve, 14- first magnet group, 15- first aperture, 16- dust cover, 17- isolator core reflection assembly, 18- second magnet group, 19- second adjustment bolt, 20- lens Slider, 21-biconcave lens, 22-telescopic lens sleeve, 23-lens pressure ring, 24-steel sleeve, 25-plano-convex lens, 26-optical path, 27-magnet body, 31-flange, 32-second aperture, 33-adjustment seat, 34-collimator body, 141-second magnetic conductor, 142-magnet, 171-first magnetic conductor, 172-reflector support body, 173-optical rotation crystal, 174-polarization beam splitter prism, 175-reflector lens. DETAILED DESCRIPTION

[0021] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and should not be construed as limiting the present invention.

[0022] In the description of the present invention, it should be understood that the terms "length", "width", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings, and are only for the convenience of describing 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 therefore cannot be understood as limiting the present invention. In addition, in the description of the present invention, "multiple" means two or more, unless otherwise clearly and specifically defined.

[0023] See also Figures 1 to 7The present invention provides a large beam aperture high-power optical isolator structure, comprising a high-power isolator 1, a beam expander lens 2, and a collimator assembly 3. The beam expander lens 2 is detachably connected to the high-power isolator 1 and is located at one end of the high-power isolator 1. The collimator assembly 3 is detachably connected to the high-power isolator 1 and is located at the other end of the high-power isolator 1. The high-power isolator 1 comprises a shell 11, a first adjusting bolt 12, a magnet sleeve 13, a first magnet group 14, a first aperture 15, a dust cover 16, an isolator core reflection assembly 17, a second magnet group 18, and a second adjusting bolt 19. The shell 11 has a first accommodating cavity 4 and a second accommodating cavity 5. The first accommodating cavity 4 is located above the second accommodating cavity 5. The bottom of the first accommodating cavity 4 has an optical path 26. Both ends of the optical path 26 pass through the shell 11. The optical path 26 assembly is detachably connected to the first accommodating cavity 4 and is located at the bottom of the first accommodating cavity 4. The first aperture 15 is detachably connected to the first accommodating cavity 4 and is located at the bottom of the first accommodating cavity 4. The left end of the optical path 26 is detachably connected and is located on the left side of the isolator core reflection component 17 and is communicated with the beam expander lens 2. The isolator core reflection component 17 is detachably connected to the optical path 26 and is located inside the optical path 26. The dust cover 16 is detachably connected to the isolator core reflection component 17 and is located above the isolator core reflection component 17. The first magnet group 14 is detachably connected to the dust cover 16 and is located at the top of the dust cover 16. The magnet sleeve 13 is detachably connected to the dust cover 16 and is located at the top of the dust cover 16 and is sleeved on the first magnet group 14. The first adjusting bolt 12 and the magnet sleeve 13 are detachably connected and are located above the first magnet group 14. The second magnet group 18 is detachably connected to the second accommodating cavity 5 and is located below the first accommodating cavity 4. The second adjusting bolt 19 is detachably connected to the second magnet group 18 and is located at the bottom of the second magnet group 18.

[0024] In this embodiment, the isolator core reflective component 17 and the optical path 26 form a Faraday rotator optical path 26 refractive structure, and the Z-folded optical path 26 reduces the volume of the TGG optical rotation crystal 173. Through this optical path folding, the composite utilization of the crystal is achieved, and ultimately the cost is saved. At the same time, it saves magnetic materials, improves the magnetic field distribution, improves the isolation, improves the heat dissipation, reduces the thermally induced birefringence and thermal lens effect to a certain extent, and the folded optical path significantly reduces the cost. The first magnet group 14 and the second magnet group 18 are used to generate the strongest and most uniform magnetic field with the least magnets, saving magnet materials. The upper and lower arrays of the magnet group are assembled, and the fixed structure is firm, stable and reliable. The magnetic conductor is used to guide the magnetic field, optimize the magnetic field distribution, and the structural space is reasonably utilized. The magnetic field will not be weakened or demagnetized due to high temperature, thereby improving the stability of the isolator. The distance between the upper and lower magnet group arrays can be adjusted to change the magnetic field, thereby realizing the adjustable rotation angle of the TGG optical rotation crystal. The large beam aperture high power isolator formed by connecting the beam expander lens 2 and the high power isolator 1 together is easy to mass produce, has high overall matching accuracy, stable and reliable structure, and is practical and beautiful. The distance between the biconcave lens 21 and the plano-convex lens 25 can be adjusted, which is convenient for adjusting the size of the light spot at the light output end, and the assembly is simple and easy. The designed core structure is conducive to the assembly of optical components, is stable and reliable, and can effectively dissipate heat and control temperature. The incident light angle of the collimator body 34 can be set arbitrarily, which is convenient for adjustment. The installed third aperture 10 avoids the influence of reverse light on the device and improves the isolation degree.

[0025] Furthermore, the isolator inner core reflection component 17 comprises two first magnetic conductors 171, two reflector supports 172, two polarization splitter prisms 174, two reflector lenses 175 and two optical rotation crystals 173, the two first magnetic conductors 171 are detachably connected to the optical path 26 and are respectively located on both sides of the optical path 26, the two reflector supports 172 are detachably connected to the corresponding first magnetic conductors 171 and are respectively located on the sides of the corresponding first magnetic conductors 171, the two reflector lenses 175 are detachably connected to the corresponding reflector supports 172 and are respectively located on the sides of the corresponding first magnetic conductors 171. The two reflective lenses 175 are respectively located on the side surfaces of the corresponding reflector support 172, and the two reflective lenses 175 are arranged in a Z shape. The two ends of the optical rotation crystal 173 are respectively detachably connected to the two reflective lenses 175 and are located between the two reflective mirrors 175. The two polarization beam splitter prisms 174 are respectively detachably connected to the optical path 26 and are located on the side surfaces of the corresponding optical rotation crystals 173, and the two optical rotation crystals 173 are located between the two polarization beam splitter prisms 174. The other optical rotation crystal 173 is detachably connected to the optical path 26 and is located at the bottom of the corresponding first magnetic conductor 171.

[0026] In this embodiment, the optically active crystal 173 located between the two reflector bodies 172 is a TGG optically active crystal, and the other optically active crystal 173 is a quartz optically active crystal 173. By comparing and analyzing the existing optically active materials, terbium gallium garnet (TGG) crystal is used. The TGG crystal has a large Faraday rotation coefficient in the 1064nm band, a small optical loss, a large optical loss threshold, a higher thermal conductivity and good mechanical properties, and is also a good material for making high-power devices. The quartz optically active crystal 173 has optically active properties along its optical axis. When used, it is not necessary to control the angle between the optical axis and the polarization direction, which is convenient to install and not prone to errors. Light is incident from the collimator assembly 3, and passes through the quartz optically active crystal 173 and the TGG optically active crystal in sequence. The TGG optically active crystal is equipped with two reflective lenses 175 on the side where the light beam is incident and the side where the light beam is emitted. The light beam is reflected inside the TGG optically active crystal through the two reflective lenses 175 to form a Z-shaped folded optical path. The two reflective lenses 175 and the two reflective mirrors 172 are fixed as a whole and then placed in the mechanical housing 11. The large side of the two reflective lenses 175 is installed close to the housing 11 to ensure the accuracy of the reflection angle of the optical path 26. The small side is aligned with the corresponding magnet group, which not only ensures that the optical path 26 can hit the two reflective lenses 175, but also ensures that the two reflective lenses 175 do not block the optical path 26. The two first magnetic conductors 171 are respectively placed in the corresponding grooves of the housing 11 and locked from the bottom with countersunk screws. The magnetic conductors can optimize the magnetic field distribution and guide the magnetic field to the TGG optical rotation crystal 173 to ensure that the magnetic field of each part of the TGG is balanced. The place where the crystal is placed is designed with space for placing thermal conductive silicone to ensure that the crystal can obtain better heat dissipation conditions. After the crystal is installed, the dust cover 16 will be installed on the upper part to protect the inner core from dust.

[0027] Furthermore, the collimator assembly 3 includes a flange 31, a second aperture 32, an adjustment seat 33 and a collimator body 34, the left end of the flange 31 is detachably connected to the shell 11 and is located at the end of the shell 11 away from the beam expander lens 2, the second aperture 32 is detachably connected to the flange 31 and is located at the right end of the flange 31, the adjustment seat 33 is detachably connected to the second aperture 32 and is located on the right side of the second aperture 32, the collimator body 34 is detachably connected to the adjustment seat 33 and is located on the right side of the collimator body 34, and the large beam aperture high power isolator 1 structure also includes a tail sleeve 6, the tail sleeve 6 is detachably connected to the shell 11 and is located at the end of the shell 11 away from the beam expander lens 2, and is sleeved on the outer surface of the collimator assembly 3.

[0028] In this embodiment, the flange 31 is fixed to the light-incoming end of the housing 11 and is locked with three screws. The collimator body 34 is fixed in the inner hole on one side of the adjustment seat 33 and is fixed with glue. One side of the adjustment seat 33 is designed as a spherical structure, and the spherical surface is aligned with the edge of the light-incoming end of the center hole of the flange 31. The adjustment seat 33 can rotate around the center of the sphere to adjust the incident angle of the collimator body 34. After adjusting the angle, the three screws on the adjustment seat 33 are locked. The tail sleeve 6 is installed on the outside of the collimator assembly 3, and the tail sleeve 6 is fixed to the housing 11 with screws to protect the adjustment mechanism.

[0029] Furthermore, the shell 11 has a cylinder 7 at one end away from the collimator assembly 3, and the cylinder 7 is connected to the optical path 26. The beam expander lens 2 includes a lens slider 20, a biconcave lens 21, a telescopic lens sleeve 22, a plano-convex lens 25, a lens pressing ring 23 and a steel sleeve 24. The right end of the lens slider 20 is detachably connected to the interior of the cylinder 7 and is located on the left side of the first aperture 15. The biconcave lens 21 is detachably connected to the lens slider 20 and is located at the left end of the lens slider 20. The telescopic lens sleeve 22 is slidably connected to the cylinder 7 and is located at the left end of the biconcave lens 21 and is sleeved on the interior of the cylinder 7. The plano-convex lens 25 is detachably connected to the telescopic lens sleeve 22 and is located at the left end of the telescopic lens sleeve 22. The lens pressing ring 23 is detachably connected to the plano-convex lens 25 and is located at the left end of the plano-convex lens 25. The steel sleeve is detachably connected to the cylinder 7 and is sleeved on the outer surface of the cylinder 7.

[0030] In this embodiment, the biconcave lens 21 is first installed into the lens slider 20, fixed with glue, and then placed in the cylinder 7 as a whole and locked with a set screw. The plano-convex lens 25 is installed in the telescopic lens sleeve 22, compressed with a pressure ring, and a sealing ring is placed in the middle. The telescopic lens sleeve 22 and the housing 11 are positioned by the shaft hole, and the depth of the telescopic lens sleeve 22 is adjusted by threading to control the distance from the plano-convex lens 25 to the biconcave lens 21 to adjust the light spot size at the light output end. After adjustment, the telescopic lens sleeve 22 is locked with a set screw. Finally, the steel sleeve 24 is put on, and there is a sealing ring between the steel sleeve 24 and the housing 11. The steel sleeve 24 is tightened and fixed by threads to protect the internal structure.

[0031] Furthermore, the large beam aperture high power isolator 1 structure also includes a cover 8 and a magnet 142 end cover 9, the cover 8 is detachably connected to the first accommodating cavity 4 and is located above the first adjusting bolt 12, and the magnet 142 end cover 9 is detachably connected to the second accommodating cavity 5 and is located below the second adjusting bolt 19.

[0032] In this embodiment, the sealing cover 8 and the magnet 142 end cover 9 can protect and prevent dust from entering the housing 11 .

[0033] Furthermore, the first magnet group 14 and the second magnet group 18 each include a magnet 142 and a second magnetic conductor 141 . The second magnetic conductor 141 is detachably connected to the magnet 142 and is located at an end of the magnet 142 away from the optical path 26 . The magnet 142 has three magnet bodies 27 .

[0034] In this embodiment, the first magnet group 142 is first installed in the magnet sleeve 13, with the large surface of the magnet 142 part of the first magnet group 14 facing outward, the first adjustment bolt 12 is installed in the middle of the magnet sleeve 13, and then the whole is installed in the housing 11, and the magnet sleeve 13 is locked with four cup head screws. The second magnet group 142 is directly installed in the second accommodating cavity 5, with the same polarity as the first magnet group 14 on the same side, and finally the magnet 142 end cover 9 with the second adjustment bolt 19 is installed, and the magnet 142 end cover 9 is locked with a countersunk screw. The first magnet group 14 and the second magnet group 18 are installed at the same rotation angle, and the magnetic field direction is perpendicular to the light inlet and light outlet surfaces of the TGG optical rotation crystal. By adjusting the first adjustment bolt 12 and the second adjustment bolt 19, the distance between the first magnet group 14 and the second magnet group 18 is changed to change the magnetic field size in the isolator core.

[0035] Furthermore, the large beam aperture high power isolator 1 also includes a third aperture 10 , which is detachably connected to the magnet sleeve 13 and is located above the optical path 26 and on a side of the first accommodating cavity 4 close to the flange 31 .

[0036] In this embodiment, the first aperture 15 and the second aperture 32 are small apertures, and the third aperture 10 is an anti-reflection aperture. The light inlet end of the adjustment seat 33 and the light outlet end of the housing 11 are both equipped with small apertures. The middle of the small aperture is a very small hole, which can block most of the reverse transmission light. A part of the reverse transmission light will be transmitted upward after passing through the PBS. At this time, an anti-reflection aperture is installed in the propagation direction of this light beam to limit the reflection of the light. The anti-reflection aperture is installed in the magnet sleeve 13 and fixed with glue. The aperture can limit the laser from returning along the incident light path 26. The aperture is made of ceramic material, which has an absorption effect on the laser, avoids the influence of the reverse light on the device, and improves the isolation.

[0037] What is disclosed above is only a preferred embodiment of the present invention, and it certainly cannot be used to limit the scope of rights of the present invention. Ordinary technicians in this field can understand that all or part of the processes of the above embodiment and equivalent changes made according to the claims of the present invention still fall within the scope of the invention.

Claims

1. A large beam aperture high power isolator structure, characterized in that: It includes a high-power isolator, a beam expander lens, and a collimator assembly. The beam expander lens is detachably connected to the high-power isolator and is located at one end of the high-power isolator. The collimator assembly is detachably connected to the high-power isolator and is located at the other end of the high-power isolator. The high-power isolator includes a shell, a first adjusting bolt, a magnet sleeve, a first magnet group, a first aperture, a dust cover, an isolator core reflection assembly, a second magnet group, and a second adjusting bolt. The shell has a first accommodating cavity and a second accommodating cavity. The first accommodating cavity is located above the second accommodating cavity. The bottom of the first accommodating cavity has an optical path. Both ends of the optical path pass through the shell. The optical path assembly is detachably connected to the first accommodating cavity and is located at the bottom of the first accommodating cavity. The first aperture is detachably connected to the left end of the optical path. Located on the left side of the isolator core reflection component and connected to the beam expander lens, the isolator core reflection component is detachably connected to the optical path and is located inside the optical path, the dust cover is detachably connected to the isolator core reflection component and is located above the isolator core reflection component, the first magnet group is detachably connected to the dust cover and is located on the top of the dust cover, the magnet sleeve is detachably connected to the dust cover and is located on the top of the dust cover, and is sleeved on the first magnet group, the first adjusting bolt is detachably connected to the magnet sleeve and is located above the first magnet group, the second magnet group is detachably connected to the second accommodating cavity and is located below the first accommodating cavity, and the second adjusting bolt is detachably connected to the second magnet group and is located at the bottom of the second magnet group; The inner core reflection component of the isolator comprises two first magnetic conductors, two reflector supports, two polarization beam splitters, two reflective lenses and two optical rotation crystals. The two first magnetic conductors are detachably connected to the optical path and are located on both sides of the optical path respectively. The two reflector supports are detachably connected to the corresponding first magnetic conductors and are located on the side faces of the corresponding first magnetic conductors respectively. The two reflective lenses are detachably connected to the corresponding reflector supports and are located on the side faces of the corresponding reflector supports respectively. The two reflective lenses are arranged in a Z shape. The two ends of the optical rotation crystal are detachably connected to the two reflective lenses and are located between the two reflective lenses. The two polarization beam splitters are detachably connected to the optical path and are located on the side faces of the corresponding optical rotation crystals. The two optical rotation crystals are located between the two polarization beam splitters. The other optical rotation crystal is detachably connected to the optical path and is located at the bottom of the corresponding first magnetic conductor. The collimator assembly includes a flange, a second aperture, an adjustment seat and a collimator body. The left end of the flange is detachably connected to the shell and is located at an end of the shell away from the beam expander lens. The second aperture is detachably connected to the flange and is located at the right end of the flange. The adjustment seat is detachably connected to the second aperture and is located on the right side of the second aperture. The collimator body is detachably connected to the adjustment seat and is located on the right side of the collimator body. The large beam aperture high power isolator structure also includes a tail sleeve, which is detachably connected to the shell and is located at an end of the shell away from the beam expander lens and is sleeved on the outer surface of the collimator assembly.

2. The large beam aperture high power isolator structure as claimed in claim 1, characterized in that: The shell has a cylinder at one end away from the collimator assembly, and the cylinder is connected to the optical path. The beam expander lens includes a lens slider, a biconcave lens, a telescopic lens sleeve, a plano-convex lens, a lens pressure ring and a steel sleeve. The right end of the lens slider is detachably connected to the interior of the cylinder and is located on the left side of the first aperture. The biconcave lens is detachably connected to the lens slider and is located at the left end of the lens slider. The telescopic lens sleeve is slidably connected to the cylinder and is located at the left end of the biconcave lens and is sleeved on the interior of the cylinder. The plano-convex lens is detachably connected to the telescopic lens sleeve and is located at the left end of the telescopic lens sleeve. The lens pressure ring is detachably connected to the plano-convex lens and is located at the left end of the plano-convex lens. The steel sleeve is detachably connected to the cylinder and is sleeved on the outer surface of the cylinder.

3. The large beam aperture high power isolator structure as claimed in claim 1, characterized in that: The large beam aperture high power isolator structure also includes a cover and a magnet end cover, wherein the cover is detachably connected to the first accommodating cavity and is located above the first adjusting bolt, and the magnet end cover is detachably connected to the second accommodating cavity and is located below the second adjusting bolt.

4. The large beam aperture high power isolator structure as claimed in claim 1, characterized in that: The first magnet group and the second magnet group both include a magnet and a second magnetic conductor. The second magnetic conductor is detachably connected to the magnet and is located at an end of the magnet away from the optical path. The magnet has three magnet bodies.

5. The large beam aperture high power isolator structure as claimed in claim 1, characterized in that: The large beam aperture high power isolator junction also includes a third aperture, which is detachably connected to the magnet sleeve and is located above the optical path and on a side of the first accommodating cavity close to the flange.

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