Optical fiber coupling end for femtosecond laser transmission optical cable

Abstract

This application provides an optical fiber coupling end for femtosecond laser transmission optical cables, including a substrate with an internal through-hole in the center of the substrate, a fiber fixing tube sleeved inside the internal through-hole, a front sleeve and a rear sleeve respectively at both ends of the substrate, the fiber fixing tube having a hollow inner cavity, the hollow inner cavity communicating with the interior of the front sleeve and the rear sleeve, one end of the rear sleeve being connected to the optical cable, the hollow fiber in the optical cable passing through the rear sleeve to extend into the hollow inner cavity, the end of the hollow inner cavity near the front sleeve having an optical fiber sleeve, the optical fiber sleeve fixing the hollow fiber end, an annular cavity between the internal through-hole and the fiber fixing tube, the substrate having a water inlet and a water outlet communicating with the annular cavity, which solves the problem of heat accumulation at the coupling end face of femtosecond laser transmission optical fibers, and allows for convenient structural optimization by using vacuum to solve problems such as nonlinear absorption and pulse width expansion of the laser.

Description

Technical Field

[0001] This utility model relates to the field of femtosecond laser fiber optic transmission, and in particular to a fiber optic coupling end for femtosecond laser transmission optical cables. Background Technology

[0002] Femtosecond lasers have a wide range of applications in medical, materials processing, and measurement fields. However, their extremely high peak power can easily interact with the transmission material and damage it. Therefore, femtosecond lasers currently mainly use optical elements to expand the beam and then transmit it through mirror groups. Although this reduces damage to the transmission material, the fixed optical path makes adjustment difficult, which limits the adaptability of femtosecond laser applications.

[0003] Current technologies consider transmitting femtosecond lasers within solid optical fibers. However, due to the high peak power of femtosecond lasers, they are prone to damaging the fiber, and the nonlinear interaction with materials can broaden the laser pulse, reducing the processing efficiency. Therefore, hollow optical fibers can be used as the transmission fiber. The hollow nature of hollow optical fibers avoids the damage caused by solid materials. Optical cables carrying hollow optical fibers can be used, with coupling heads installed at both ends to achieve optical transmission with other devices. However, this transmission method generates light leakage and heat at the coupling surfaces. Given the high instantaneous power of femtosecond lasers, inadequate heat dissipation can lead to burnout of the coupling heads. Utility Model Content

[0004] This invention provides an optical fiber coupling end for femtosecond laser transmission optical cables, which solves the problem of heat accumulation at the coupling end face of femtosecond laser transmission optical fibers.

[0005] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is as follows: an optical fiber coupling end for a femtosecond laser transmission optical cable, comprising a substrate, an inner through hole with both ends through the center of the substrate, an optical fiber fixing tube sleeved inside the inner through hole, a front end sleeve and a rear end sleeve respectively provided at both ends of the substrate, the optical fiber fixing tube having a hollow inner cavity, the hollow inner cavity communicating with the interior of the front end sleeve and the rear end sleeve, one end of the rear end sleeve being connected to the optical cable, the hollow optical fiber in the optical cable passing through the rear end sleeve to extend into the hollow inner cavity, an optical fiber sleeve being provided at the end of the hollow inner cavity near the front end sleeve, the optical fiber sleeve fixing the hollow optical fiber end, an annular cavity being provided between the inner through hole and the optical fiber fixing tube, and the substrate having a water inlet hole and a water outlet hole communicating with the annular cavity.

[0006] In the preferred embodiment, a water inlet groove is provided between the water inlet hole and the annular clamping cavity, and a water outlet groove is provided between the annular clamping cavity and the water inlet groove. A first sealing cover plate is also provided, and a transverse thin-walled region is provided on the first sealing cover plate. The two ends of the transverse thin-walled region are close to the water inlet groove and the water outlet groove, respectively. Temperature sensors are provided at both ends of the transverse thin-walled region.

[0007] In a preferred embodiment, the inner through hole sidewall of the substrate is provided with a light-transmitting hole and a first light-transmitting mirror that closes the light-transmitting hole, the fiber optic fixing tube sidewall is provided with a notch and a second light-transmitting mirror that closes the notch, and a light intensity sensor is also provided. The light intensity sensor detects the light intensity inside the hollow cavity through the first and second light-transmitting mirrors.

[0008] In the preferred embodiment, a third light-transmitting lens is provided at one end of the front-end sleeve away from the optical fiber fixing tube, the substrate is provided with an air inlet and a vent, a connecting transition air cavity is provided between the air inlet and the vent, one side of the transition air cavity is open and provided with a second sealing cover, the vent is connected to the inside of the front-end sleeve, and the hollow optical fiber core is connected to the front-end sleeve.

[0009] In the preferred embodiment, a cable connection sleeve is provided at the end of the rear sleeve away from the substrate. The cable connection sleeve is connected to the optical cable, and the cable connection sleeve has an injection hole that communicates with the interior of the rear sleeve.

[0010] In the preferred embodiment, a support frame is provided inside the rear sleeve. The lower end of the support frame is sleeved with the optical fiber fixing tube, and the upper end of the support frame is provided with a support sleeve. The support sleeve supports the end of the optical cable and seals the cavity between the optical cable and the cable connection sleeve. The side wall of the support frame is provided with a hollow part.

[0011] In a preferred embodiment, the optical fiber fixing tube includes an outer end and an inner sleeve end. The inner sleeve end is located inside the inner through hole. The outer end is sleeved with the end of the inner sleeve end. The outer end and the inner sleeve end are detachable. The optical fiber sleeve is located at the end of the outer end. Both ends of the inner sleeve end are provided with sealing adhesive layers. The inner sleeve end is provided with a first phase change material, and the outer end is provided with a second phase change material.

[0012] The beneficial effects of this invention are as follows: liquid cooling removes the heat accumulated at the end of the hollow fiber, preventing burn-out; the gas path design allows for external air extraction to create a vacuum in the hollow fiber, avoiding nonlinear absorption caused by the interaction between the femtosecond laser and air, which reduces laser transmission efficiency and causes pulse width broadening, thus lowering the quality of the femtosecond laser; it features light leakage and temperature monitoring functions to monitor the status of the fiber coupling end in real time; and encapsulating the phase change material within the fiber fixing tube improves heat transfer efficiency while maintaining the temperature of the fiber end within a safe range during the phase change process, preventing instantaneous high temperatures from burning out the fiber end. Attached Figure Description

[0013] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0014] Figure 1 This is a structural diagram of the optical cable and its coupling end.

[0015] Figure 2 This is a cross-section of the coupling end. Figure 1 .

[0016] Figure 3This is a cross-section of the coupling end. Figure 2 .

[0017] Figure 4 This is a schematic diagram of the substrate.

[0018] Figure 5 This is a diagram of the sensor installation structure.

[0019] Figure 6 This is a structural diagram of the transition air cavity.

[0020] Figure 7 This is an installation diagram of the fiber optic fixing tube and support frame.

[0021] Figure 8 This is a schematic diagram of the injection of the first phase change material.

[0022] Figure 9 This is a schematic diagram of the fixed tube and its extended end being installed into the base.

[0023] Figure 10 This is a schematic diagram of the second phase change material injection.

[0024] Figure 11 This is a diagram showing the cable connector sleeve in place.

[0025] Figure 12 This is a schematic diagram showing the front sleeve in place.

[0026] In the figure: Matrix 1; Inner through hole 101; Air inlet 102; Transition air cavity 103; Vent 104; Water inlet 105; Water outlet 106; Water inlet trough 107; Water outlet trough 108; First sealing cover 109; Transverse thin-walled region 110; Temperature sensor 111; Light transmission hole 112; First light transmission mirror 113; Second light transmission mirror 114; Light intensity sensor 115; Second sealing cover 116; Fourth light transmission mirror 117; Color-changing agent package 118; Fiber optic fixing tube 2; Fiber optic sleeve 201; Hollow inner cavity 202; Annular ring Clamping cavity 203; Outer end 204; Inner sleeve end 205; Hollow fiber 3; Sealing adhesive layer 301; First phase change material 302; Second phase change material 303; Temporary plug 304; Front sleeve 4; Third light transmission lens 401; Rear sleeve 5; Movable rotating sleeve 501; Support frame 502; Hollowed-out part 503; Support sleeve part 504; Top screw 505; Optical cable 6; Cable connecting sleeve 601; Glue injection hole 602; End fixing sleeve 7; Air extraction hole 701; Water inlet hole 702; Water outlet hole 703; Cable outlet hole 704; Outer sheath 705. Detailed Implementation

[0027] like Figure 1-12A fiber optic coupling end for a femtosecond laser transmission optical cable includes a substrate 1. The substrate 1 has an inner through hole 101 with both ends through it in the center. An optical fiber fixing tube 2 is sleeved inside the inner through hole 101. A front sleeve 4 and a rear sleeve 5 are respectively provided at both ends of the substrate 1. The optical fiber fixing tube 2 has a hollow inner cavity 202, which is connected to the interior of the front sleeve 4 and the rear sleeve 5. One end of the rear sleeve 5 is connected to an optical cable 6. The hollow optical fiber 3 in the optical cable 6 passes through the rear sleeve 5 and extends into the hollow inner cavity 202. An optical fiber sleeve 201 is provided at the end of the hollow inner cavity 202 near the front sleeve 4. The optical fiber sleeve 201 fixes the end of the hollow optical fiber 3. An annular cavity 203 is provided between the inner through hole 101 and the optical fiber fixing tube 2. The substrate 1 has a water inlet hole 105 and a water outlet hole 106 that are connected to the annular cavity 203.

[0028] Because light leakage and heat generation occur at the coupling surface of the optical fiber, and due to the high instantaneous power of the femtosecond laser, inadequate heat dissipation can lead to burnout of the fiber tip. Furthermore, the outer sheath of optical cable 6 is typically thick, hindering heat dissipation, and its flexibility makes the actual position of the fiber tip unstable, making it difficult to align with other devices. Therefore, considering all factors, it is necessary to remove the sheath from the end of optical cable 6, exposing the bare hollow optical fiber 3.

[0029] The fiber optic fixing tube 2 is a heat-conducting metal tube. Coolant is introduced into the annular cavity 203 through the water inlet 105 to cool the fiber optic fixing tube 2 and the bare fiber inside the fiber optic fixing tube 2. The coolant is discharged from the water outlet 106. The external liquid cooling circulation controller continuously circulates the liquid in the annular cavity 203 to remove the heat generated by the fiber optic end.

[0030] The fiber optic sleeve 201 at one end of the fiber optic fixing tube 2 fixes the end of the hollow fiber 3, and the rear sleeve 5 fixes the optical cable 6, thereby fixing the bare fiber in between.

[0031] The hollow fiber 3 of the optical cable is positioned on the end sleeve axis by two coupling ends. The combination of the optical cable and the coupling ends forms a standard component. Adjusting the orientation of the coupling ends allows for alignment with the laser generator at the front end and the user equipment at the back end, which protects the optical fiber and simplifies the difficulty of optical path adjustment.

[0032] In a preferred embodiment, a water inlet groove 107 is provided between the water inlet hole 105 and the annular clamping cavity 203, and a water outlet groove 108 is provided between the annular clamping cavity 203 and the water inlet groove 107. A first sealing cover plate 109 is also provided, and a transverse thin-walled region 110 is provided on the first sealing cover plate 109. The two ends of the transverse thin-walled region 110 are close to the water inlet groove 107 and the water outlet groove 108, respectively. Temperature sensors 111 are provided at both ends of the transverse thin-walled region 110.

[0033] The first sealing cover 109 is installed on the base 1 and sealed by flat-head screws, preventing leakage at the open ends of the inlet tank 107 and the outlet tank 108. A transverse recess is machined on the first sealing cover 109 to reduce the wall thickness. One end of the recess is located in the area of ​​the inlet tank 107, and the other end is located in the area of ​​the outlet tank 108. Two patch-type temperature sensors 111 are attached here to monitor the inlet and outlet water temperatures, so as to provide feedback on the temperature inside the fiber optic fixing tube 2.

[0034] In a preferred embodiment, the inner through hole 101 of the substrate 1 is provided with a light-transmitting hole 112 on its side wall and a first light-transmitting mirror 113 that closes the light-transmitting hole 112. The fiber optic fixing tube 2 is provided with a notch on its side wall and a second light-transmitting mirror 114 that closes the notch. A light intensity sensor 115 is also provided. The light intensity sensor 115 detects the light intensity inside the hollow inner cavity 202 through the first light-transmitting mirror 113 and the second light-transmitting mirror 114.

[0035] The light intensity sensor 115 is also installed on the first sealing cover plate 109. The first sealing cover plate 109 has a through hole at the light-transmitting hole 112 and the light intensity sensor 115 is installed thereon.

[0036] When the optical path is unobstructed, the laser beam is emitted from the end of the hollow fiber 3. Very little light leaks out from the cladding of the hollow fiber 3. If the end of the hollow fiber 3 is burned out, the optical path is blocked and the light is reflected and refracted along the cladding and leaks into the hollow inner cavity 202 of the fiber fixing tube 2. The light intensity detected by the light intensity sensor 115 surges.

[0037] In the preferred embodiment, a third light-transmitting lens 401 is provided at one end of the front end sleeve 4 away from the optical fiber fixing tube 2, the substrate 1 is provided with an air inlet 102 and an air vent 104, a connecting transition air cavity 103 is provided between the air inlet 102 and the air vent 104, one side of the transition air cavity 103 is open and provided with a second sealing cover plate 116, the air vent 104 is connected to the inside of the front end sleeve 4, and the inner core of the hollow optical fiber 3 is connected to the front end sleeve 4.

[0038] The air vent 102 is connected to an external negative pressure air path, evacuating the gas from the transition air chamber 103, the interior of the front sleeve 4, and the core of the hollow fiber 3, thus creating a vacuum state within the core of the hollow fiber 3. This avoids the nonlinear interaction between the laser and air.

[0039] The second sealing cover plate 116 is provided with a fourth light-transmitting mirror 117. A color-changing agent package 118 that changes color when it comes into contact with oxygen is placed in the transition gas cavity 103. When the vacuum state in the transition gas cavity 103 is broken, the color-changing agent package 118 can be directly observed to be oxidized and changed color through the fourth light-transmitting mirror 117 on the second sealing cover plate 116, indicating that the core of the hollow optical fiber 3 is no longer in a vacuum state.

[0040] An end fixing sleeve 7 is fitted on the outer side of the rear sleeve 5, and an outer sheath 705 is provided on the outer side of the base 1. One end of the outer sheath 705 is fitted with the end fixing sleeve 7, and the other end of the outer sheath 705 is fitted with the front sleeve 4. The end fixing sleeve 7 is provided with an air extraction hole 701, a water inlet hole 702, a water outlet hole 703, and a wiring hole 704. The air extraction hole 701 is connected to the air intake hole 102, the water inlet hole 702 is connected to the water intake hole 105, and the water outlet hole 703 is connected to the water outlet hole 106. The wiring of the temperature sensor 111 and the light intensity sensor 115 passes through the wiring hole 704. An integrated electrical terminal can be installed at the wiring hole 704. The end fixing sleeve 7 is an integrated installation structure of pipe connectors and electrical terminals.

[0041] The outer sheath 705 has a transparent observation window near the fourth lens 117.

[0042] In a preferred embodiment, a cable connecting sleeve 601 is provided at the end of the rear sleeve 5 away from the substrate 1. The cable connecting sleeve 601 is sleeved with the optical cable 6. The cable connecting sleeve 601 is provided with an injection hole 602 that communicates with the interior of the rear sleeve 5.

[0043] The optical cable 6 is pre-attached to the cable connecting sleeve 601. The end of the rear sleeve 5 is provided with a rotatable rotating sleeve 501. The rotating sleeve 501 is threadedly connected to the cable connecting sleeve 601. After the optical cable 6 is adjusted into place, there are two glue injection holes 602. Glue is injected into the rear sleeve 5 through one of the glue injection holes 602. The glue fills the inner cavity of the rear sleeve 5 and the hollow inner cavity 202. The other glue injection hole 602 is used to vent air. After waiting for the glue to solidify, the hollow optical fiber 3 is then fixed.

[0044] Because the inner diameter of the rear sleeve 5 is relatively large, this glue injection method requires a large amount of glue. Furthermore, due to the small inner diameter of the hollow cavity 202 and the viscosity of the glue, it may be difficult to completely fill the hollow cavity 202 with glue. Moreover, after glue injection in this way, the substrate 1, the fiber optic fixing tube 2, the rear sleeve 5, the cable connecting sleeve 601, and the movable rotating sleeve 501 are all bonded together, making them difficult to disassemble and reuse.

[0045] In the preferred embodiment, a support sleeve 502 is provided inside the rear sleeve 5. The lower end of the support sleeve 502 is sleeved with the optical fiber fixing tube 2. The upper end of the support sleeve 502 is provided with a support sleeve 504. The support sleeve 504 supports the end of the optical cable 6 and seals the cavity between the optical cable 6 and the cable connection sleeve 601. The side wall of the support sleeve 502 is provided with a hollow part 503.

[0046] Because of the high instantaneous power of femtosecond lasers, frequent temperature changes lead to frequent thermal expansion and contraction. The instantaneous high temperature also causes the adhesive to age faster. Therefore, even if adhesive is injected into the coupling end, the bonded parts will still loosen after long-term use.

[0047] The hollow fiber 3 can be pre-fixed by injecting adhesive into the hollow inner cavity 202 through the perforated part 503 from the upper end of the fiber fixing tube 2. Since the sleeve part 504 separates the rear sleeve 5 and the cable connecting sleeve 601, after injecting adhesive through the injection hole 602, only the optical cable 6, the cable connecting sleeve 601, and the sleeve part 504 are bonded together, while the rest remains in a hollow state. This reduces the amount of adhesive injected and avoids the cable connecting sleeve 601 from bonding together with the rear sleeve 5, the movable rotating sleeve 501, etc., which would prevent the device from being reused. Due to the reduced amount of adhesive, the injection time, the adhesive curing time, and the weight of the coupling end are all significantly reduced.

[0048] After the glue has solidified, lock the set screw 505 on the movable rotating sleeve 501 to fix the cable connecting sleeve 601.

[0049] Even if glue comes off or parts become loose, the coupling end can be detached, part of the cable and fiber can be cut off, the coupling end can be reassembled and glued back on.

[0050] In a preferred embodiment, the fiber optic fixing tube 2 includes an extended end 204 and an inner sleeve end 205. The inner sleeve end 205 is disposed in the inner through hole 101. The extended end 204 is sleeved with the end of the inner sleeve end 205. The extended end 204 and the inner sleeve end 205 are detachable. The fiber optic sleeve 201 is disposed at the end of the extended end 204. The two ends of the inner sleeve end 205 are provided with sealing adhesive layers 301. The inner sleeve end 205 is provided with a first phase change material 302. The extended end 204 is provided with a second phase change material 303.

[0051] The first phase change material 302 is a transparent solid-liquid phase change material, which does not affect the light intensity detection of the light intensity sensor 115.

[0052] Since the extended end 204 is closer to the fiber end face, the second phase change material 303 can be a liquid alloy phase change material with a stronger thermal conductivity.

[0053] Phase change materials (PCMs) have a higher thermal conductivity than ordinary adhesives, accelerating heat dissipation at the fiber optic end. During the phase transition, the temperature of the PCM remains constant, maintaining a relatively low and constant temperature at the fiber optic end, thus avoiding excessive thermal expansion and contraction and slowing down adhesive aging.

[0054] The assembly method for the coupling end is as follows:

[0055] Customized support sleeve 502 with the correct length and diameter specifications;

[0056] The fiber optic fixing tube 2 and the support sleeve 502 are pre-fitted together;

[0057] Connect the cable connector 601 onto the optical cable 6 for later use;

[0058] A certain length of hollow fiber 3 is stripped from the end of the optical cable 6. The hollow fiber 3 passes through the support sleeve 502 and is inserted into the fiber fixing tube 2 until it extends out from the other end of the fiber fixing tube 2. Sufficient length is reserved at the extended end, and the optical cable 6 abuts against the sleeve part 504.

[0059] The temporary plug 304 is passed through the hollow optical fiber 3 and sealed at the first end of the inner sleeve 205. A small piece of glue is injected into the first end of the inner sleeve 205 through a thin tube. After solidification, a sealing glue layer 301 is formed to fix the hollow optical fiber 3.

[0060] A liquid phase change material 302 is injected from the second end into the inner sleeve end 205;

[0061] After the first phase change material 302 cools and solidifies, a small piece of glue is injected into the second end of the inner sleeve 205. After solidification, a sealing glue layer 301 is formed to fix the hollow optical fiber 3.

[0062] Remove the temporary plug 304 and insert the protruding end 204 into the inner through hole 101;

[0063] The extended end 204 is sleeved on the hollow optical fiber 3. One end of the extended end 204 is sleeved on the inner sleeve end 205. The open end of the extended end 204 is facing upward, and the liquid phase second phase change material 303 is injected into the extended end 204.

[0064] After the second phase change material 303 solidifies, the inner and outer walls of the optical fiber sleeve 201 are coated with glue and sleeved on the hollow optical fiber 3. The optical fiber sleeve 201 is inserted into the extended end 204, and the end abuts against the end of the solid second phase change material 303.

[0065] After the adhesive for fixing the fiber optic sleeve 201 has solidified, the hollow fiber 3, the fiber optic sleeve 201, and the end of the extension 204 away from the substrate 1 are cut flat.

[0066] The movable sleeve 501 and the cable connecting sleeve 601 are fitted and locked together. Glue is injected into the space between the support part 504 and the cable connecting sleeve 601 through the glue injection hole 602. After solidification, the optical cable 6, the cable connecting sleeve 601 and the support part 504 are connected as one.

[0067] The structure includes the front sleeve 4 and the outer sheath 705.

[0068] The above embodiments are merely preferred technical solutions of this utility model and should not be considered as limitations on this utility model. The protection scope of this utility model should be the technical solution described in the claims, including equivalent substitutions of the technical features described in the claims. That is, equivalent substitutions and improvements within this scope are also within the protection scope of this utility model.

Claims

1. An optical fiber coupling terminator for femtosecond laser transmission optical cables, characterized in that: The substrate (1) includes a central through-hole (101) with two through holes, and an optical fiber fixing tube (2) is fitted inside the through-hole (101). The substrate (1) has a front sleeve (4) and a rear sleeve (5) at both ends. The optical fiber fixing tube (2) has a hollow cavity (202) that is connected to the front sleeve (4) and the rear sleeve (5). One end of the rear sleeve (5) is connected to the optical cable (6). The optical cable (6) has a hollow cavity (202) inside. The core fiber (3) passes through the rear sleeve (5) to extend into the hollow inner cavity (202). The hollow inner cavity (202) is provided with an optical fiber sleeve (201) at one end near the front sleeve (4). The optical fiber sleeve (201) fixes the end of the hollow core fiber (3). An annular cavity (203) is provided between the inner through hole (101) and the optical fiber fixing tube (2). The substrate (1) is provided with a water inlet hole (105) and a water outlet hole (106) communicating with the annular cavity (203).

2. The fiber optic coupling terminator for femtosecond laser transmission cable according to claim 1, characterized in that: A water inlet groove (107) is provided between the water inlet hole (105) and the annular clamping cavity (203), and a water outlet groove (108) is provided between the annular clamping cavity (203) and the water inlet groove (107). A first sealing cover plate (109) is also provided. A transverse thin-walled area (110) is provided on the first sealing cover plate (109). The two ends of the transverse thin-walled area (110) are close to the water inlet groove (107) and the water outlet groove (108) respectively. Temperature sensors (111) are provided at both ends of the transverse thin-walled area (110).

3. The fiber optic coupling terminator for femtosecond laser transmission cable according to claim 1, characterized in that: The substrate (1) has a light-transmitting hole (112) on the side wall of the inner through hole (101) and a first light-transmitting mirror (113) that closes the light-transmitting hole (112). The fiber optic fixing tube (2) has a gap on the side wall and a second light-transmitting mirror (114) that closes the gap. A light intensity sensor (115) is also provided. The light intensity sensor (115) detects the light intensity in the hollow inner cavity (202) through the first light-transmitting mirror (113) and the second light-transmitting mirror (114).

4. The fiber optic coupling terminator for femtosecond laser transmission cable according to claim 1, characterized in that: The front end sleeve (4) is provided with a third light-transmitting lens (401) at one end away from the optical fiber fixing tube (2). The substrate (1) is provided with an air intake hole (102) and an air vent (104). A connecting transition air chamber (103) is provided between the air intake hole (102) and the air vent (104). The transition air chamber (103) is open on one side and is provided with a second sealing cover plate (116). The air vent (104) is connected to the inside of the front end sleeve (4). The inner core of the hollow optical fiber (3) is connected to the front end sleeve (4).

5. The fiber optic coupling terminator for femtosecond laser transmission optical cable according to claim 1, characterized in that: The end of the rear sleeve (5) away from the substrate (1) is provided with a cable connecting sleeve (601), which is connected to the optical cable (6). The cable connecting sleeve (601) is provided with an injection hole (602) that communicates with the interior of the rear sleeve (5).

6. The fiber optic coupling terminator for femtosecond laser transmission cable according to claim 5, characterized in that: The rear sleeve (5) is provided with a support frame (502). The lower end of the support frame (502) is sleeved with the optical fiber fixing tube (2). The upper end of the support frame (502) is provided with a support sleeve (504). The support sleeve (504) supports the end of the optical cable (6) and seals the cavity between the optical cable (6) and the cable connection sleeve (601). The side wall of the support frame (502) is provided with a hollow part (503).

7. The fiber optic coupling terminator for femtosecond laser transmission cables according to claim 6, characterized in that: The fiber optic fixing tube (2) includes an extended end (204) and an inner sleeve end (205). The inner sleeve end (205) is located in the inner through hole (101). The extended end (204) is sleeved with the end of the inner sleeve end (205). The extended end (204) and the inner sleeve end (205) are detachable. The fiber optic sleeve (201) is located at the end of the extended end (204). The inner sleeve end (205) has sealing adhesive layers (301) at both ends. The inner sleeve end (205) has a first phase change material (302) inside and the extended end (204) has a second phase change material (303) inside.

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