CN116727867A - Optical fiber microstructure processing device and method based on femtosecond laser - Google Patents

Optical fiber microstructure processing device and method based on femtosecond laser Download PDF

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Publication number
CN116727867A
CN116727867A CN202310820908.6A CN202310820908A CN116727867A CN 116727867 A CN116727867 A CN 116727867A CN 202310820908 A CN202310820908 A CN 202310820908A CN 116727867 A CN116727867 A CN 116727867A
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optical fiber
camera
processing
core
femtosecond laser
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苑立波
樊思允
王洪业
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Nanning Guidian Electronic Technology Research Institute Co ltd
Guilin University of Electronic Technology
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Nanning Guidian Electronic Technology Research Institute Co ltd
Guilin University of Electronic Technology
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K26/00—Working by laser beam, e.g. welding, cutting or boring
    • B23K26/352—Working by laser beam, e.g. welding, cutting or boring for surface treatment
    • B23K26/355—Texturing
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K26/00—Working by laser beam, e.g. welding, cutting or boring
    • B23K26/02—Positioning or observing the workpiece, e.g. with respect to the point of impact; Aligning, aiming or focusing the laser beam
    • B23K26/06—Shaping the laser beam, e.g. by masks or multi-focusing
    • B23K26/062—Shaping the laser beam, e.g. by masks or multi-focusing by direct control of the laser beam
    • B23K26/0622—Shaping the laser beam, e.g. by masks or multi-focusing by direct control of the laser beam by shaping pulses
    • B23K26/0624—Shaping the laser beam, e.g. by masks or multi-focusing by direct control of the laser beam by shaping pulses using ultrashort pulses, i.e. pulses of 1ns or less
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P40/00—Technologies relating to the processing of minerals
    • Y02P40/50—Glass production, e.g. reusing waste heat during processing or shaping
    • Y02P40/57—Improving the yield, e-g- reduction of reject rates

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  • Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Engineering & Computer Science (AREA)
  • Plasma & Fusion (AREA)
  • Mechanical Engineering (AREA)
  • Mechanical Coupling Of Light Guides (AREA)

Abstract

The invention provides an optical fiber microstructure processing device and method based on femtosecond laser. The device comprises: the device comprises an optical fiber clamping platform, a CCD camera, a processing objective lens, a U-shaped capillary tube and a high-precision electric displacement platform. The preparation method is based on femtosecond laser microstructure processing, optical fibers are fixed on a clamping platform, two CCD cameras are imaged by utilizing an algorithm to obtain the arrangement positions of optical fiber cores, the U-shaped capillary is positioned in a processing area and is placed close to the optical fibers, a processing objective lens and the other CCD camera are fixed on a high-precision electric displacement table, and the focusing light spot position is changed by controlling the movement of the high-precision electric displacement table. The method can quickly and accurately move the focusing light spot to the target position, effectively solves the problem of difficult core finding in the preparation process of the multi-core optical fiber, improves the stability and efficiency of the preparation effect, and can be widely applied to an optical fiber microstructure processing system. The invention is suitable for the technical field of optical fiber micromachining.

Description

Optical fiber microstructure processing device and method based on femtosecond laser
Field of the art
The invention relates to the technical field of optical fiber microstructure processing, in particular to an optical fiber microstructure processing device and method based on femtosecond laser.
(II) background art
In recent years, in a large background of growing interest in multi-core optical fibers, fiber gratings are increasingly applied to multi-core optical fibers to form various types of multi-core fiber gratings. Because the advantages of the multi-core optical fiber and the optical fiber grating are combined, the multi-core optical fiber grating type device has important application value and wide application prospect in the fields of optical fiber communication and optical fiber sensing. In a space division multiplexing optical fiber communication system, a multi-core optical fiber grating can be used for dispersion compensation and filtering of channels; in the field of optical fiber sensing, the multi-core fiber bragg grating can be used for designing a novel sensor with multiple dimensions and multiple parameters, and has been reported in the related fields of micro robots and minimally invasive surgery. In addition, the multi-core fiber grating is also applied to the technical fields of high-power lasers, astronomical observation, engineering monitoring and the like. And the grating array sensing technology is used as a new generation of optical fiber sensing technology, so that the technical limitation that the optical fiber or a single grating is used as a sensing unit in the prior art is solved.
The existing technical scheme for preparing the fiber bragg grating is ultraviolet laser inscription, the preparation method is highly dependent on the photosensitivity of the fiber, and the prepared grating has poor stability at high temperature, but still has important application value; the second is that the femtosecond laser preparation method combines the femtosecond laser direct writing method realized by the high-precision electric displacement table to be more flexible, and can prepare the special grating with complex structure; the high-quality grating can be efficiently and stably prepared by utilizing the femtosecond laser and the phase mask, and the high-quality grating can be widely applied to the construction of a distributed sensing system.
At present, the processing of microstructures in optical fibers is still a difficult problem, because the optical fibers have cylindrical effects, the positions of fiber cores observed only through images are deviated from the positions where the fiber cores are actually positioned, the focusing positions are difficult to determine when processing in the fiber cores, in multi-core optical fibers, the fiber cores are densely and complicated in arrangement, so that the processing positions are more difficult to find through observing images, and in patents (a method for automatically completing the tracking of the central axes of the fiber cores based on an image recognition technology, CN 111190250A) a method for automatically finding cores based on the image recognition technology is proposed, and the method is not suitable for processing in multi-core optical fibers; in the patent (a femto-second laser preparation method of a multi-core optical fiber serial-parallel integrated microstructure array: CN 202310094451), a method for selecting and writing a core in the multi-core optical fiber is proposed, but the method still needs to control the focusing position of a light spot through manual operation, the operation is complex, the writing quality is difficult to ensure, and the problem that the micro structure is still difficult to solve by using the femto-second laser in the multi-core optical fiber is still less in related research.
(III) summary of the invention
The invention aims to provide an optical fiber microstructure processing device and method based on femtosecond laser. By utilizing the device and the method, the processing on different fiber cores of the multi-core optical fiber can be realized, the optical fiber is not required to be pretreated before the preparation, the preparation process is not required to be manually interfered, the light spots can be quickly and accurately focused on the positions of the target fiber cores under the automatic control of an algorithm, the yield and the preparation efficiency are improved, and the device and the method can be widely applied to optical fiber microstructure processing systems.
The purpose of the invention is realized in the following way:
the invention discloses a device and a method for processing an optical fiber microstructure based on femtosecond laser. The imaging system comprises three CCD cameras, wherein the cameras 101 and the cameras 102 are orthogonally placed, are arranged on one side close to a processing area, are fixed on sliding blocks of two arms of an L-shaped sliding rail, and are controlled by two micro stepping motors; the processing objective lens is fixed on a high-precision electric displacement table, and is hereinafter referred to as a processing platform.
The optical fiber is fixed on the optical fiber clamping platform during processing, the optical fiber passes through the field of view range of the camera 101 and the camera 102 and clings to the inner wall of the U-shaped capillary, in order to further eliminate the cylindrical effect of the optical fiber, the refractive index matching liquid is dripped at the gap between the optical fiber and the inner wall of the capillary, the capillary is positioned in the moving stroke of the processing platform, the light beam emitted by the laser is transmitted through the light path and compressed by the objective lens to form a focusing light spot, further, when the position of the processing platform is adjusted to enable the camera 106 to clearly image the focusing mark on the plane of the U-shaped capillary, the focusing light spot is also positioned on the plane of the capillary, the moving distance required by the focusing light spot is calculated according to the arrangement condition of the fiber cores obtained by the imaging reduction of the cameras 101 and 102, and the computer controls the electric displacement platform to move the focusing light spot to the position of the target fiber core.
The optical fiber clamping platform is of U-shaped integrated design, two soft precise guide wheels with V-shaped grooves are designed at the contact points of the optical fiber clamping platform and the optical fiber, an air suction V-shaped groove is designed at one side of the guide wheels, which is close to a processing area, for limiting the position of the optical fiber, and a jackscrew fine tuning knob is designed on the clamping platform.
An optical fiber microstructure processing device and method based on femtosecond laser, the method includes:
after the optical fiber to be processed is fixed on the clamping platform, the optical fiber is scanned and imaged in the Z direction through the camera 101 and the center of the visual field of the camera 101, the scanning range is the diameter length of the end face containing the optical fiber cladding, the optical fiber is scanned and imaged in the Y direction through the camera 102, and the scanning range is larger than the diameter length of the end face containing the optical fiber cladding; and then splicing the scanned images in the time domain by using an algorithm, and integrating and restoring the images obtained in the two directions to obtain the arrangement positions of the fiber cores in the current optical fiber.
The optical fiber is placed close to the inner wall of the U-shaped capillary tube in the processing area, further, a matching liquid storage tank is arranged on the capillary tube fixing frame, the gap between the optical fiber and the inner wall of the capillary tube is filled with the matching liquid by using a pressure pump, and the influence of the cylindrical effect of the optical fiber on the focusing position of the light spot is further eliminated.
After the position of the capillary is determined, the computer controls the processing platform to move, so that a focusing mark point on the plane of the capillary is positioned at the center of the visual field of the camera 106, the position of the processing platform in the Y direction is adjusted, the focusing mark can be clearly imaged in the camera 106, at the moment, a light spot is focused on the plane of the capillary after passing through an objective lens with the same focal length as the camera, and the light spot is positioned at the center of the upper edge and the lower edge of the capillary at the same height as the focusing mark point.
Because the type of the optical fiber to be processed is known before processing, the distance between each fiber core is known, and the thickness of the capillary is known, the relative distance between the light spot and each fiber core can be determined through calculation, the movement of the processing platform is controlled accordingly, and the light spot is focused on the target fiber core to finish the preparation.
Compared with the prior art, the invention has the advantages that:
(1) The invention provides an optical fiber microstructure processing device and method based on femtosecond laser, which utilize a U-shaped capillary as a reference standard for the position movement of a writing light spot, eliminate the offset influence of the cylindrical effect of an optical fiber on the position of a focusing light spot, obtain a movement distance parameter after a computer analyzes the imaging of a CCD camera, automatically control a processing platform to move through an algorithm, adjust the position of the focusing light spot to a target position to finish preparation, and realize automatic continuous writing of a grating array on different fiber cores of a multi-core optical fiber without manual interference in the preparation process.
(2) The method provided by the invention is suitable for various preparation systems, including ultraviolet laser lithography, femtosecond laser direct writing and femtosecond laser phase mask method, can realize the writing of a large number of fiber grating arrays, can realize the writing of fiber grating arrays with arbitrary length by matching with a rewinding system, and effectively improves the production efficiency.
(3) The device and the method are suitable for preparing various multi-core optical fibers, including conventional multi-core optical fibers, high-density multi-core optical fibers, circularly arranged multi-core optical fibers, linearly arranged multi-core optical fibers, polarization-maintaining multi-core optical fibers and the like.
(IV) description of the drawings
FIG. 1 is a schematic view of the apparatus of the present invention;
FIG. 2 is a schematic diagram of a U-shaped capillary;
FIG. 3 is a schematic diagram of an imaging system;
FIG. 4 is a schematic diagram of a seven-core fiber core finding;
FIG. 5 is a schematic illustration of a nineteen-core fiber core finding;
FIG. 6 is a schematic diagram of a core finding of a multi-core optical fiber in a circular arrangement;
FIG. 7 is a schematic diagram of a linear arrangement of multicore fibers;
FIG. 8 is a schematic diagram of a four-core hollow elliptical multi-core polarization maintaining fiber core finding;
in the figure:
1-imaging system, 101-CCD camera, 102-CCD camera, 103-L type slide rail, 104-slide block, 105-miniature stepper motor, 106-CCD camera;
2-processing objective lens, 3-U-shaped capillary tube and 4-high precision displacement table;
5-optical fiber clamping platform, 501-limiting guide wheel, 502-air suction V-groove, 503-capillary bracket and 504-liquid storage groove;
(fifth) detailed description of the invention
For the purpose of promoting an understanding of the principles and advantages of the invention, reference will now be made to the drawings in which there will be illustrated, by way of illustration, and not as an actual or complete description, the embodiments of the invention. All other embodiments, based on the described embodiments, which a person of ordinary skill in the art would obtain without making any inventive effort, are within the scope of the invention.
The invention discloses a device and a method for processing an optical fiber microstructure based on femtosecond laser, wherein the preparation device comprises the following steps: the device comprises an imaging system, a processing objective lens, a U-shaped capillary tube, a high-precision electric displacement table and an optical fiber clamping platform.
The technical route of the invention is that the multi-core optical fiber microstructure based on femtosecond laser is processed and prepared, a U-shaped capillary is used as a reference standard for the position movement of a inscription light spot, the offset influence of the cylindrical effect of the optical fiber on the position of a focusing light spot is eliminated, a computer analyzes the imaging of a CCD camera and then restores to obtain the fiber core arrangement condition, the movement distance is calculated through an algorithm, the movement of a processing platform is automatically controlled, and the focusing light spot is adjusted to the position of a target fiber core, thus the preparation is completed. The preparation process does not need to strip a coating layer and manual interference, can realize processing various microstructures on different fiber cores of the multi-core optical fiber, and the required parameters are automatically calculated by a computer according to a preset program, so that the processing flow is simplified, and the production efficiency is improved.
The invention will now be described in further detail with reference to the drawings and to specific examples.
As shown in FIG. 1, the invention discloses an optical fiber microstructure processing device and method based on femtosecond laser. The device comprises CCD cameras 101, 102 and 106, a processing objective lens 2, a U-shaped capillary tube 3, an optical fiber clamping platform 4 and a high-precision displacement platform 5.
After the optical fiber to be processed is fixed on the optical fiber clamping platform, the optical fiber is scanned and imaged in the Z direction and the Y direction respectively through the camera 101 and the camera 102 by passing through the visual field center of the camera 101 and the camera 102, the scanning range is the diameter length of the end face containing the optical fiber cladding, then the scanned image is spliced in the time domain by using an algorithm, and then the images obtained in the two directions are integrated and restored to obtain the distribution position of the fiber cores in the current optical fiber, and the imaging system structure is shown in figure 2; at the processing area, the optical fiber is closely attached to the inner surface of the U-shaped capillary, the matching liquid fills the gap between the optical fiber and the inner wall of the capillary, and the capillary structure is shown in figure 3; the computer controls the processing platform to move, so that the focusing mark point on the front surface of the capillary tube is positioned at the center of the visual field of the camera 106, the processing platform is adjusted to move in the Y direction, so that the focusing mark point can clearly image in the camera, at the moment, a light spot is focused on the plane of the capillary tube after passing through an objective lens with the same focal length as the camera, and the light spot is at the same height as the focusing mark point, and the relative distance between the light spot and each fiber core can be determined through calculation, thereby controlling the processing platform to move, and focusing the light spot on the target fiber core to finish the preparation.
Example 1
In this embodiment, a quartz heptacore single mode fiber with a coating layer is taken as an example for illustration, and the method specifically includes the following steps:
step S1: fixing the optical fiber on an optical fiber clamping platform to enable the optical fiber to be clung to the inner surface of the capillary; initializing the camera, calibrating the images of the camera 101 and the camera 102, and enabling the optical fibers to clearly appear in the field of view of the camera; adjusting the initial position of the processing platform to enable a focusing reference point M on the capillary to be positioned at the center of the visual field of the camera 106, wherein a focusing light spot is exactly positioned on the plane of the capillary;
because the movement in the processing refers to the relative position, and the focusing mark point M on the capillary is a reference standard of the relative value, the calibration of the initial position of the processing platform is a key step of the processing, firstly, the focusing mark point M on the capillary is found in a snake-shaped scanning mode and is positioned at the right center of the visual field of the camera 106, then, the processing platform is finely tuned back and forth to find the position at which the focusing mark point is most clearly imaged, and at the moment, the focusing light spot is exactly positioned on the plane of the capillary;
step S2: scanning and imaging the optical fiber in the Z direction and the Y direction respectively through a camera 101 and a camera 102, wherein the scanning range is the diameter length of the end face containing the optical fiber cladding, then splicing the scanned images in the time domain by using an algorithm, and integrating and restoring the images obtained in the two directions to obtain the arrangement position of the fiber cores in the optical fiber at present, as shown in fig. 4;
step S3: the light spot is located on the capillary plane where the mark point is located, and given the capillary thickness d (mm), the distance from the light spot to the intermediate core 1 is: d (mm), the distance X between the fiber core 1 and the fiber core 3 1 (mm) the angle between the fiber core and the horizontal reference line is known as theta (theta is more than 0 DEG and less than or equal to pi/2);
inscribing the fiber core 1: the light spot moves d (mm) from the initial position to the +Y direction;
inscribing the fiber core 3: the light spot moves d+X from the initial position to +Y direction 1 cos θ (mm), X is shifted in +Z direction 1 sin theta (mm), and the rest fiber cores are the same, and only the value of < theta is changed;
example 2
The embodiment provides a method for inscribing grating arrays on different fiber cores of a multi-core fiber grating, which is illustrated by taking a quartz nineteen-core single-mode fiber with a coating layer as an example, and specifically comprises the following steps:
step S1: fixing the optical fiber on an optical fiber clamping platform to enable the optical fiber to be clung to the inner surface of the capillary; initializing the camera, calibrating the images of the camera 101 and the camera 102, and enabling the optical fibers to clearly appear in the field of view of the camera; adjusting the initial position of the processing platform to enable a focusing reference point M on the capillary to be positioned at the center of the visual field of the camera 106, wherein a focusing light spot is exactly positioned on the plane of the capillary;
step S2: scanning and imaging the optical fiber in the Z direction and the Y direction respectively through a camera 101 and a camera 102, wherein the scanning range is the diameter length of the end face containing the optical fiber cladding, then splicing the scanned images in the time domain by using an algorithm, and integrating and restoring the images obtained in the two directions to obtain the arrangement position of the fiber cores in the optical fiber at present, as shown in fig. 5;
step S3: the light spot is located on the capillary plane where the mark point is located, and given the capillary thickness d (mm), the distance from the light spot to the intermediate core 1 is: d (mm), adjacent core spacing X 2 (mm) the angle between the fiber core and the horizontal reference line is known as theta (theta is more than 0 DEG and less than or equal to pi/2);
inscribing the fiber core 1: the light spot moves d (mm) from the initial position to the +Y direction;
inscribing the core 7: the light spot moves d+X from the initial position to +Y direction 2 cos θ (mm), X is shifted in +Z direction 2 sin theta (mm), and fiber cores 2, 3, 4, 5 and 6 are the same, and only the value of < theta is changed;
inscribing the core 19: the spot moves d +.3X from the initial position to the +Y direction 2 cos θ (mm), move in +Z direction ≡3X 2 sin theta (mm), the fiber cores 9, 11, 13, 15 and 17 are the same, and only the value of < theta is changed;
inscribing the core 18: the light spot moves d+2X from the initial position to the +Y direction 2 cos θ (mm), 2X in +Z direction 2 sin theta (mm), the fiber cores 8, 10, 12, 14, 16 and 18 are the same, and only the value of the angle theta is changed;
example 3
In this embodiment, a coated quartz ring-shaped multi-core fiber is taken as an example for illustration, and the method specifically includes the following steps:
step S1: fixing the optical fiber on an optical fiber clamping platform to enable the optical fiber to be clung to the inner surface of the capillary; initializing the camera, calibrating the images of the camera 101 and the camera 102, and enabling the optical fibers to clearly appear in the field of view of the camera; adjusting the initial position of the processing platform to enable a focusing reference point M on the capillary to be positioned at the center of the visual field of the camera 106, wherein a focusing light spot is exactly positioned on the plane of the capillary;
step S2: scanning and imaging the optical fiber in the Z direction and the Y direction respectively through a camera 101 and a camera 102, wherein the scanning range is the diameter length of the end face containing the optical fiber cladding, then splicing the scanned images in the time domain by using an algorithm, and integrating and restoring the images obtained in the two directions to obtain the arrangement position of the fiber cores in the optical fiber at present, as shown in fig. 6;
step S3: the light spot is located on the capillary plane where the mark point is located, and given that the capillary thickness is d (mm), the distance between the light spot and the fiber core 1 in the Y direction is: d (mm), the radius of the circumference of the fiber core is X 3 (mm), wherein the included angle between the fiber core and the horizontal reference line is theta (theta is more than 0 DEG and less than or equal to pi/2);
inscribing the fiber core 3: the light spot moves d+X from the initial position to +Y direction 3 cos θ (mm), X is shifted in +Z direction 3 sin theta (mm), and the rest fiber cores are the same, and only the value of < theta is changed;
example 4
In this embodiment, a coated quartz linearly arranged multi-core optical fiber is taken as an example for illustration, and the method specifically includes the following steps:
step S1: fixing the optical fiber on an optical fiber clamping platform to enable the optical fiber to be clung to the inner surface of the capillary; initializing the camera, calibrating the images of the camera 101 and the camera 102, and enabling the optical fibers to clearly appear in the field of view of the camera; adjusting the initial position of the processing platform to enable a focusing reference point M on the capillary to be positioned at the center of the visual field of the camera 106, wherein a focusing light spot is exactly positioned on the plane of the capillary;
step S2: scanning and imaging the optical fiber in the Z direction and the Y direction respectively through a camera 101 and a camera 102, wherein the scanning range is the diameter length of the end face containing the optical fiber cladding, then splicing the scanned images in the time domain by using an algorithm, and integrating and restoring the images obtained in the two directions to obtain the arrangement position of the fiber cores in the optical fiber at present, as shown in fig. 7;
step S3: the light spot is located on the capillary plane where the mark point is located, and given that the capillary thickness is d (mm), the distance between the light spot and the fiber core 5 in the Y direction is: d (mm), core 5 to core 9 spacing X 4 (mm), each core spacing X 5 (mm), the included angle theta between the plane of the fiber core and the vertical reference line (theta is more than 0 DEG and less than or equal to pi/2);
inscribing the core 5: the light spot moves d (mm) from the initial position to the +Y direction;
inscribing the core 9: spot from the beginningThe start position moves by d+X in +Y direction 4 sin θ (mm), move X in-Z direction 4 cos theta (mm), core 1 is the same, only change the value of +.theta;
inscribing the core 8: the spot moves d+ (X) from the initial position to the +Y direction 4 -X 5 ) sin θ (mm), move in the-Z direction (X 4 -X 5 ) cos theta (mm), core 2 is the same, only change the value of +.theta;
inscribing the core 7: the spot moves d+ (X) from the initial position to the +Y direction 4 -2X 5 ) sin θ (mm), move in the-Z direction (X 4 -2X 5 ) cos theta (mm), core 3 is the same, only change the value of +.theta;
inscribing the core 6: the spot moves d+ (X) from the initial position to the +Y direction 4 -3X 5 ) sin θ (mm), move in the-Z direction (X 4 -3X 5 ) cos theta (mm), core 4 is the same, changing only the value of +.theta;
example 5
In this embodiment, a quartz four-core hollow elliptic multi-core polarization-maintaining fiber with a coating layer is taken as an example for illustration, and the method specifically comprises the following steps:
step S1: fixing the optical fiber on an optical fiber clamping platform to enable the optical fiber to be clung to the inner surface of the capillary; initializing the camera, calibrating the images of the camera 101 and the camera 102, and enabling the optical fibers to clearly appear in the field of view of the camera; adjusting the initial position of the processing platform to enable a focusing reference point M on the capillary to be positioned at the center of the visual field of the camera 106, wherein a focusing light spot is exactly positioned on the plane of the capillary;
step S2: scanning and imaging the optical fiber in the Z direction and the Y direction respectively through a camera 101 and a camera 102, wherein the scanning range is the diameter length of the end face containing the optical fiber cladding, then splicing the scanned images in the time domain by using an algorithm, and integrating and restoring the images obtained in the two directions to obtain the arrangement position of the fiber cores in the optical fiber at present, as shown in fig. 8;
step S3: the light spot is positioned on the capillary plane where the mark point is positioned, the thickness of the capillary is known as d (mm), and the distance between the corresponding two fiber cores is X 6 (mm), the included angle between the fiber core and the horizontal reference line is theta (0 DEG < theta)≤Π/2)；
Inscribing the fiber core 2: the light spot moves d+X from the initial position to +Y direction 6 cos θ/2 (mm), X is moved in +Z direction 6 sin theta/2 (mm), and the rest fiber cores are the same, and only the value of < theta is changed;
the invention and its embodiments have been described above by way of illustration and not limitation, and the actual construction and method of construction illustrated in the accompanying drawings is not limited to this. Therefore, if one of ordinary skill in the art is informed by this disclosure, a structural manner and an embodiment similar to the technical scheme are not creatively designed without departing from the gist of the present invention, and all the structural manners and the embodiments belong to the protection scope of the present invention.

Claims (8)

1. An optical fiber microstructure processing apparatus based on femtosecond laser, the apparatus comprising: the device comprises an imaging system (1), a processing objective lens (2), a U-shaped capillary tube (3), a high-precision electric displacement table (4) and an optical fiber clamping platform (5).
2. The optical fiber microstructure processing apparatus based on femtosecond laser according to claim 1, wherein: the imaging system (1) comprises three CCD cameras, the cameras (101) and the cameras (102) are orthogonally placed, the cameras are installed on one side close to a processing area, the cameras are fixed on sliding blocks (104) of two arms of an L-shaped sliding rail (103) and controlled by two micro stepping motors (105), the cameras (106) are installed at the same height as the center of the objective lens (2) and close to one side of the objective lens, and the imaging distance of the cameras (106) is equal to the focal length of the objective lens.
3. The optical fiber microstructure processing apparatus based on femtosecond laser according to claim 1, wherein: the processing objective lens (2) camera (106) is fixed on the high-precision electric displacement table (4) and can focus light beams.
4. The optical fiber microstructure processing apparatus based on femtosecond laser according to claim 1, wherein: the optical fiber clamping platform (5) is U-shaped, limiting guide wheels (501) with V-shaped grooves are respectively arranged at the contact points of the two ends and the optical fibers, one section of air suction V-shaped groove platform (502) is respectively arranged at one side of each guide wheel close to a processing area, and further, a capillary bracket (503) is fixed on the base and is provided with a liquid storage groove (504).
5. The optical fiber microstructure processing apparatus based on femtosecond laser according to claim 1, wherein: the inner diameter of the U-shaped capillary tube (3) is slightly larger than the diameter of the optical fiber, one half of the U-shaped capillary tube is polished and ground, the other side of the U-shaped capillary tube is polished and ground into a plane, the width of the plane is larger than the inner diameter of the capillary tube, the length of the U-shaped capillary tube is not smaller than the distance between the CCD camera (106) and the processing objective lens, and a focusing reference mark is arranged on the plane.
6. The optical fiber microstructure processing method based on the femtosecond laser is characterized by comprising the following steps of:
s1: fixing the optical fiber to the fiber holding platform so as to appear in the field of view of the camera (101, 102);
s2: firstly, imaging the optical fiber by layering scanning through a camera (101) and a camera (102);
s3: a camera (106) is enabled to focus on a focus reference mark point on the plane of the U-shaped capillary tube (3) clearly;
s4: according to the fiber core position arrangement condition obtained by scanning imaging, calculating the required moving distance of the high-precision electric displacement table, and moving the focusing light spot to the target fiber core.
7. The method for processing the optical fiber microstructure based on the femtosecond laser according to claim 6, wherein: in step S2, the layered scanning imaging method for the optical fiber is: the camera (101) scans along the Z direction over a distance equal to or greater than the diameter of the optical fiber; the camera (102) scans along the Y direction for a distance which is larger than or equal to the diameter of the optical fiber, and the fiber core arrangement position is restored after the image is analyzed by an algorithm.
8. The method for processing the optical fiber microstructure based on the femtosecond laser according to claim 6, wherein: in step S3, the focusing reference mark point is close to one end of the capillary and is positioned at the center of the upper and lower edges of the capillary, the mark point is arranged at the center of the field of view of the CCD camera (106) by adjusting the movement of the high-precision electric displacement table (4), the position of the CCD camera is adjusted in the Y direction, and when the camera obtains clear mark point imaging, the focusing light spot is positioned at the center of the upper and lower edges of the capillary plane.
CN202310820908.6A 2023-07-06 2023-07-06 Optical fiber microstructure processing device and method based on femtosecond laser Pending CN116727867A (en)

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