CN112596249A - Optical path adjusting device and method of optical fiber laser - Google Patents
Optical path adjusting device and method of optical fiber laser Download PDFInfo
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- CN112596249A CN112596249A CN202011460145.1A CN202011460145A CN112596249A CN 112596249 A CN112596249 A CN 112596249A CN 202011460145 A CN202011460145 A CN 202011460145A CN 112596249 A CN112596249 A CN 112596249A
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B27/00—Optical systems or apparatus not provided for by any of the groups G02B1/00 - G02B26/00, G02B30/00
- G02B27/09—Beam shaping, e.g. changing the cross-sectional area, not otherwise provided for
- G02B27/0938—Using specific optical elements
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/005—Optical devices external to the laser cavity, specially adapted for lasers, e.g. for homogenisation of the beam or for manipulating laser pulses, e.g. pulse shaping
- H01S3/0057—Temporal shaping, e.g. pulse compression, frequency chirping
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01S—DEVICES USING THE PROCESS OF LIGHT AMPLIFICATION BY STIMULATED EMISSION OF RADIATION [LASER] TO AMPLIFY OR GENERATE LIGHT; DEVICES USING STIMULATED EMISSION OF ELECTROMAGNETIC RADIATION IN WAVE RANGES OTHER THAN OPTICAL
- H01S3/00—Lasers, i.e. devices using stimulated emission of electromagnetic radiation in the infrared, visible or ultraviolet wave range
- H01S3/10—Controlling the intensity, frequency, phase, polarisation or direction of the emitted radiation, e.g. switching, gating, modulating or demodulating
- H01S3/13—Stabilisation of laser output parameters, e.g. frequency or amplitude
- H01S3/1305—Feedback control systems
Abstract
The invention provides a light path adjusting device and a method of a fiber laser, wherein the light path adjusting device comprises a lens cone, a hole plate assembly and an adjusting bracket; the hole plate assembly comprises a plurality of hole plates, the hole plates are detachably arranged at the light inlet and the light outlet of the lens barrel, and the hole plates are provided with holes which are coaxial with the lens barrel; the adjusting bracket is provided with a lens barrel, so that the lens barrel can be adjusted along the X-axis direction, the Y-axis direction, the rotating direction surrounding the X-axis and the rotating direction surrounding the Y-axis, and the X-axis direction is vertical to the Y-axis direction and is distributed on a plane where an optical axis vertical to the lens barrel is located. The invention can quickly position the offset of the laser beam passing through the light path adjusting device relative to the hole on the pore plate, ensures the consistency of the optical axes of the laser beams, and has the advantages of high precision, simple and convenient operation, high debugging efficiency, capability of adapting to light paths with various laser spot sizes and the like.
Description
Technical Field
The invention relates to the technical field of lasers and application, in particular to a light path adjusting device and method of a fiber laser.
Background
The optical fiber laser is a laser using rare earth element doped glass optical fiber as a gain medium. Compared with the traditional solid laser, the fiber laser has the advantages of small volume, long service life, high laser brightness, high laser conversion efficiency, good laser beam quality and the like, thereby being widely applied to the fields of material processing, optical communication, spectral imaging, medical treatment and the like.
In recent years, with the increasing demand for laser processing accuracy, the demand for laser spots formed by laser beams of fiber lasers in the fields of optical storage, spectral imaging and medicine is also increasing, which in turn requires that the laser beams must have better monochromaticity, higher coherence and smaller divergence angle. One important evaluation criterion for the quality of the laser beam is the laser beam quality factor M2. In the field of fiber laser technology, the traditional method for testing the quality factor of a laser beam is to use two 45-degree reflecting mirror groups in a test light path so as to adjust the light path of the laser beam entering a beam quality factor tester.
The requirement for the directionality of the laser beam entering the tester is relatively high because it must be ensured that the laser beam is incident perpendicularly onto the light receiving surface of the CCD detector on the tester. In the actual test process, mainly rely on two reflectors that 45 arrange, a reflector is used for the horizontal direction of debugging light path, and another reflector is used for the vertical direction of debugging light path, and it is comparatively loaded down with trivial details to adjust the operation, and is inefficient to the debugging of light path. Meanwhile, the offset of the laser light path is sensitive to the reflector, and is easily affected by the installation deformation and other micro-variation of the reflector, so that the light path is difficult to finely adjust.
Disclosure of Invention
The invention provides a light path adjusting device and a light path adjusting method of a fiber laser, which are used for solving the problems that the existing light path adjusting device is complicated to operate and is difficult to finely adjust a light path.
The invention provides a light path adjusting device of a fiber laser, comprising: lens cone, orifice plate assembly and adjusting bracket; the orifice plate assembly comprises a plurality of orifice plates, the orifice plates are detachably arranged at the light inlet and the light outlet of the lens barrel, the orifice plates are provided with openings which are coaxial with the lens barrel, and the openings are used for laser beams to pass through; the lens cone is installed on the adjusting bracket, so that the lens cone can be adjusted along the X-axis direction, the Y-axis direction, the rotating direction surrounding the X-axis and the rotating direction surrounding the Y-axis, and the X-axis direction is perpendicular to the Y-axis direction and is distributed on a plane where an optical axis perpendicular to the lens cone is located.
According to the optical path adjusting device of the optical fiber laser, provided by the invention, the adjusting bracket comprises a fixing frame and an adjusting plate which are arranged at intervals; a fixed point position, a first adjusting point position and a second adjusting point position are arranged on the fixing frame, a connecting line of the fixed point position and the first adjusting point position is arranged along the X-axis direction, and a connecting line of the fixed point position and the second adjusting point position is arranged along the Y-axis direction; the fixing frame is fixedly connected with the first surface of the adjusting plate through the fixing point position; the fixing frame is respectively connected with the first surface in an adjustable manner along the optical axis direction of the lens cone through the first adjusting point position and the second adjusting point position; the adjusting plate is provided with a through hole, the lens barrel penetrates through the through hole, the outer diameter of the lens barrel is smaller than the aperture of the through hole, and the lens barrel is connected with a second surface, back to the first surface, of the adjusting plate; the adjusting plate is provided with a third adjusting point position and a fourth adjusting point position, and is respectively connected with the outer side wall of the lens barrel along the radial direction in an adjustable manner through the third adjusting point position and the fourth adjusting point position, the radial adjusting direction of the third adjusting point position is along the X-axis direction, and the radial adjusting direction of the fourth adjusting point position is along the Y-axis direction.
According to the optical path adjusting device of the optical fiber laser, provided by the invention, a first adjusting bolt is arranged at the first adjusting point position, a second adjusting bolt is arranged at the second adjusting point position, the first adjusting bolt and the second adjusting bolt are both arranged on the fixing frame, and the screw ends of the first adjusting bolt and the second adjusting bolt respectively vertically extend to the first surface along the optical axis direction; the third adjusting point is provided with a third adjusting bolt, the fourth adjusting point is provided with a fourth adjusting bolt, the third adjusting bolt and the fourth adjusting bolt are installed on the adjusting plate, the screw end of the third adjusting bolt and the screw end of the fourth adjusting bolt extend into the through hole, and extend to the outer side wall of the lens barrel along the radial direction.
According to the optical path adjusting device of the optical fiber laser, the fixing frame comprises a fixing part and an adjusting part, the fixing part and the adjusting part are arranged perpendicularly, the adjusting part and the adjusting plate are arranged at intervals, and the fixing point, the first adjusting point and the second adjusting point are arranged on the adjusting part.
According to the optical path adjusting device of the optical fiber laser, the adjusting bracket further comprises an installing plate, and the installing plate is installed on the second surface of the adjusting plate and fixedly connected with the lens barrel.
According to the optical path adjusting device of the optical fiber laser, the lens barrel comprises a first lens barrel and a second lens barrel, the first lens barrel is slidably inserted into the second lens barrel, the first lens barrel penetrates through the through hole, and the second lens barrel is fixedly connected with the mounting plate.
According to the optical path adjusting device of the optical fiber laser, provided by the invention, the orifice plate assembly comprises a first group of orifice plates and a second group of orifice plates; the first group of pore plates comprise a first pore plate and a second pore plate, the first pore plate is used for being installed at a light inlet of the lens cone, the second pore plate is used for being installed at a light outlet of the lens cone, the diameter of an opening of the first pore plate is smaller than 2/3 of the diameter of a light spot of the laser beam, and the diameter of an opening of the second pore plate is larger than 1.5 times of the diameter of the light spot; the second group of pore plates comprise a third pore plate and a fourth pore plate, the third pore plate is used for being installed at the light inlet of the lens barrel, the fourth pore plate is used for being installed at the light outlet of the lens barrel, the opening diameter of the third pore plate is smaller than 2/3 of the diameter of the light spot, and the opening diameter of the fourth pore plate is larger than 2/3 of the diameter of the light spot.
According to the optical path adjusting device of the fiber laser provided by the invention, the radius of the opening and the wavelength of the laser beam satisfy the following formula:
θ0＝0.61λ/a；
wherein, theta0The diffraction angle corresponding to the diffraction ring with the maximum illumination intensity formed on the CCD target surface by the laser beam through the opening is represented; λ represents the wavelength of the laser beam; a represents the radius of the opening; the CCD target surface is arranged on the side close to the light outlet of the lens cone, and the CCD target surface is perpendicular to the direction of the optical axis of the lens cone.
The invention also provides an adjusting method of the optical path adjusting device of the optical fiber laser, which comprises the following steps: s1, arranging the fiber laser, the lens cone and the CCD target surface in sequence along the transmission direction of the laser beam, and installing the lens cone on the adjusting bracket; s2, installing a first pore plate at the light inlet of the lens cone, installing a second pore plate at the light outlet of the lens cone, starting the fiber laser, and adjusting the lens cone in the X-axis direction and the Y-axis direction until the center of a light spot formed by the laser beam on the CCD target surface coincides with the center of the positioning mark on the CCD target surface; s3, detaching the first pore plate and the second pore plate from the lens cone, installing a third pore plate at the light inlet of the lens cone, installing a fourth pore plate at the light outlet of the lens cone, and adjusting the rotation direction of the lens cone around the X axis and the rotation direction of the lens cone around the Y axis until the light spots form a diffraction ring pattern with central symmetry distribution on the CCD target surface; the aperture of the holes on the first orifice plate, the second orifice plate, the third orifice plate and the fourth orifice plate is set according to the wavelength of the laser beam.
According to an adjusting method provided by the present invention, S1 further includes: setting the output power of the fiber laser, enabling the beam energy corresponding to the output power to be within the safety threshold range of the beam quality factor tester, starting the fiber laser, recording light spots formed by laser beams on a CCD target surface, and primarily positioning the light spots through positioning marks on the CCD target surface; wherein, the CCD target surface is arranged on the light beam quality factor tester.
According to the optical path adjusting device and method of the optical fiber laser, the lens cone, the orifice plate assembly and the adjusting support are arranged, and under the matching of a plurality of orifice plates, the offset of the laser beam passing through the optical path adjusting device relative to the opening on the orifice plate can be quickly positioned based on the adjusting function of the adjusting support on the lens cone along the X-axis direction, the Y-axis direction, the rotating direction surrounding the X axis and the rotating direction surrounding the Y axis according to the small-hole diffraction and facula imaging principles, so that the consistency of the optical axis of the laser beam is ensured, and the optical path adjusting device and the method have the advantages of higher precision, simplicity and convenience in operation, high debugging efficiency, capability of adapting to optical paths with various laser facula sizes and the like.
Drawings
In order to more clearly illustrate the technical solutions of the present invention or the prior art, the drawings needed for the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and those skilled in the art can also obtain other drawings according to the drawings without creative efforts.
Fig. 1 is a schematic perspective view of an optical path adjusting device of a fiber laser provided by the present invention;
FIG. 2 is a schematic front view of an optical path adjusting device of a fiber laser provided by the present invention;
FIG. 3 is a schematic perspective view of an adjustment bracket provided in the present invention;
FIG. 4 is a front view of the adjusting bracket of the present invention;
FIG. 5 is a schematic flow chart of an adjusting method of the optical path adjusting device based on the fiber laser provided by the invention;
FIG. 6 is a schematic diagram of a non-uniform symmetric diffraction ring on a CCD target surface obtained by conditioning a first set of aperture plates according to an embodiment of the present invention;
FIG. 7 is a schematic diagram of a uniform symmetric diffraction ring on a CCD target surface obtained by conditioning a second set of aperture plates according to an embodiment of the present invention;
reference numerals:
1: a lens barrel; 2: an orifice plate assembly; 3: adjusting the bracket;
31: a fixed mount; 32: an adjusting plate; 33: mounting a plate;
301: fixing the point location; 302: a first point of adjustment; 303: a second point of adjustment;
304: a third point of adjustment; 305: and a fourth point of adjustment.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clearer, the technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings, and it is obvious that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The optical path adjusting apparatus and method of the fiber laser according to the present invention will be described with reference to fig. 1 to 5.
As shown in fig. 1 to 4, the present embodiment provides an optical path adjusting apparatus of a fiber laser, including: the lens cone 1, the orifice plate assembly 2 and the adjusting bracket 3; the aperture plate assembly 2 comprises a plurality of aperture plates, the aperture plates are detachably mounted at the light inlet and the light outlet of the lens barrel 1, the aperture plates are provided with openings coaxial with the lens barrel 1, the openings are used for allowing laser beams to pass through, and the openings are preferably circular holes; the lens barrel 1 is mounted on the adjusting bracket 3, so that the lens barrel 1 can be adjusted along the X-axis direction, the Y-axis direction, the rotating direction around the X-axis and the rotating direction around the Y-axis, and the X-axis direction is perpendicular to the Y-axis direction and is distributed on the plane where the optical axis of the lens barrel 1 is located.
It is specific, this embodiment is through setting up lens cone 1, orifice plate subassembly 2 and regulation support 3, according to aperture diffraction and facula formation of image principle, under the cooperation of a plurality of orifice plates, can be based on adjust support 3 along X axle direction, Y axle direction, encircle in the turning round of X axle and encircle in the turning round of Y axle to lens cone 1's regulatory action, the quick offset of locating the laser beam through adjusting device for trompil on the orifice plate, the uniformity of laser beam's optical axis has been ensured, it is higher to have the precision, easy and simple to handle, debug efficiently, advantages such as the light path of the various laser facula sizes of ability adaptation, easily integrate with other laser instrument testing arrangement's interface.
It should be noted here that in the fiber laser beam quality, i.e., M2 measurement system, the optical axis of the optical system in the beam quality factor tester must be kept coincident with the optical axis of the laser transmission system, and the system has a high requirement on the accuracy of the optical axis consistency, which will directly reflect the results of the beam quality, spot shape, spot size, etc. received on the CCD target surface of the beam quality factor tester. Because the laser beam has offset in the emitting surface in the directions of the X axis and the Y axis, and also has offset in pitch (rotation) and rotation in the directions of the X axis and the Y axis, the adjustment of the lens barrel 1 by the adjusting bracket 3 can be realized in the embodiment, so that the adjustment of the offset of the laser beam relative to the hole on the hole plate can be realized, the optical axis of the laser beam output by the fiber laser can be adjusted according to the principle of pinhole diffraction and spot imaging, and the consistency of the optical axis of the laser beam output by the fiber laser and the optical axis of an optical system in the beam quality factor tester can be ensured.
The adjusting bracket 3 shown in the present embodiment may be configured by an XY translation stage known in the art and a rotation mechanism that rotates along the X axis and the Y axis, respectively, or may be configured by a combination structure of a fixing frame 31 and an adjusting plate 32 shown in the following embodiments, which is not limited in detail herein.
Meanwhile, the orifice plate assembly 2 shown in the present embodiment includes a first group of orifice plates and a second group of orifice plates. The first group of pore plates comprise a first pore plate and a second pore plate, the first pore plate is used for being installed at a light inlet of the lens cone 1, the second pore plate is used for being installed at a light outlet of the lens cone 1, 2/3 that the diameter of an opening of the first pore plate is smaller than the diameter of a light spot of the laser beam can be specifically arranged, and the diameter of an opening of the second pore plate is larger than 1.5 times of the diameter of the light spot. Meanwhile, the second group of hole plates includes a third hole plate and a fourth hole plate, the third hole plate may be specifically configured to be mounted at the light entrance of the lens barrel 1, the fourth hole plate is mounted at the light exit of the lens barrel 1, the diameter of the opening of the third hole plate is smaller than 2/3 of the diameter of the spot of the laser beam, and the diameter of the opening of the fourth hole plate is larger than 2/3 of the diameter of the spot.
As shown in fig. 2 and fig. 3, the adjusting bracket 3 of the present embodiment includes a fixing frame 31 and an adjusting plate 32 which are spaced apart from each other.
Further, the fixing frame 31 shown in this embodiment is provided with a fixing point position 301, a first adjusting point position 302 and a second adjusting point position 303, a connecting line between the fixing point position 301 and the first adjusting point position 302 is arranged along the X-axis direction, and a connecting line between the fixing point position 301 and the second adjusting point position 303 is arranged along the Y-axis direction; the fixing frame 31 is fixedly connected with the first surface of the adjusting plate 32 through a fixing point position 301; the fixing frame 31 is adjustably connected to the first surface along the optical axis direction of the lens barrel 1 through a first adjustment point 302 and a second adjustment point 303.
In this embodiment, a first adjusting bolt is installed at the first adjusting point position 302, a second adjusting bolt is installed at the second adjusting point position 303, the first adjusting bolt and the second adjusting bolt are both installed on the fixing frame 31, and screw ends of the first adjusting bolt and the second adjusting bolt respectively extend perpendicularly to the first surface of the adjusting plate 32 along the optical axis direction. In this way, by adjusting the feed amount of the first adjusting bolt, the rotational offset amount of the laser beam with respect to the Y axis can be finely adjusted. By adjusting the feeding amount of the second adjusting bolt, the pitching offset of the laser beam relative to the X axis can be slightly adjusted.
Further, a through hole is formed in the adjusting plate 32 shown in this embodiment, the lens barrel 1 penetrates through the through hole, the outer diameter of the lens barrel 1 is smaller than the aperture of the through hole, and the lens barrel 1 is connected with a second surface, which is opposite to the first surface, of the adjusting plate 32.
Further, the adjustment plate 32 shown in this embodiment is provided with a third adjustment position 304 and a fourth adjustment position 305, and is respectively connected to the outer sidewall of the lens barrel 1 along the radial direction in an adjustable manner through the third adjustment position 304 and the fourth adjustment position 305, the radial adjustment direction of the third adjustment position 304 is along the X-axis direction, and the radial adjustment direction of the fourth adjustment position 305 is along the Y-axis direction.
In this embodiment, a third adjusting bolt is installed at the third adjusting point position 304, a fourth adjusting bolt is installed at the fourth adjusting point position 305, the third adjusting bolt and the fourth adjusting bolt are installed on the adjusting plate 32, and screw ends of the third adjusting bolt and the fourth adjusting bolt extend into the through hole and extend to the outer side wall of the lens barrel 1 along the radial direction. In this way, by adjusting the feed amount of the third adjusting bolt, the offset amount in the X-axis direction of the laser beam can be finely adjusted. By adjusting the feed amount of the fourth adjusting bolt, the offset of the laser beam in the Y-axis direction can be finely adjusted.
It should be noted here that the adjusting plate 32 shown in the present embodiment may be provided in a rectangular shape. The third adjustment positions 304 shown in this embodiment are not limited to one, and two adjustment positions may be provided, and are respectively disposed on opposite sides of the adjustment plate 32 in the X direction. Meanwhile, the fourth adjustment positions 305 shown in the present embodiment are not limited to one, and may be provided in two and are respectively provided on opposite sides of the adjustment plate 32 in the Y direction.
As shown in fig. 3, the fixing frame 31 of the present embodiment includes a fixing portion and an adjusting portion, the fixing portion and the adjusting portion are disposed perpendicularly, the adjusting portion and the adjusting plate 32 are disposed at an interval, and the adjusting portion has a fixing point 301, a first adjusting point 302 and a second adjusting point 303.
During actual installation, the fixing portion of the fixing frame 31 can be horizontally arranged and installed on the optical platform which is horizontally distributed, and a strip-shaped installation hole can be formed in the fixing portion to adjust the installation position of the fixing frame 31.
Preferably, the adjusting bracket 3 shown in the present embodiment further includes a mounting plate 33, and the mounting plate 33 is mounted on the second surface of the adjusting plate 32 and is fixedly connected to the lens barrel 1.
As shown in fig. 1, in order to facilitate the adjustment of the axial distance between two pore plates installed at two ends of the lens barrel 1, the lens barrel 1 shown in this embodiment includes a first lens barrel and a second lens barrel, the first lens barrel is slidably inserted into the second lens barrel, the first lens barrel passes through the through hole, and the second lens barrel is fixedly connected to the installation plate 33.
It should be noted here that the orifice plate shown in the present embodiment is screwed to the lens barrel 1. Wherein, can set up the annular edgewise that extends along circumference on one of them side of orifice plate, set up the internal thread on annular edgewise, set up the external screw thread at the tip of lens cone 1 to can carry out threaded connection through internal thread and external screw thread with orifice plate and lens cone 1.
The solution shown in this example will be derived from the round-hole fraunhofer diffraction theory.
Assuming that the radius of the circular hole on the pore plate is a, the center of the circular hole and the center of the CCD target surface are on the same optical axis, and theta is the diffraction angle of the laser beam after passing through the circular hole, i.e. the included angle between the laser beam after passing through the center of the circular hole and the optical axis, the light intensity of point P at the diffraction angle theta received on the CCD target surface can be obtained as shown in the following formula:
in the formula I0＝(πa2)|C1|2Represents the center point P on the optical axis0The intensity of light at; j. the design is a square1(Z) is a one-stage Bessel function; z ═ ka θ, and represents the light intensity distribution formula of the circular hole diffraction obtained.
It can be seen from the above formula that the laser beam reaches the point P on the CCD target surface after being diffracted by the aperture, and the light intensity of the point P and the corresponding diffraction angle form a light spot, however, the solution shown in this embodiment needs to adjust the quality of the light path of the laser beam, i.e., adjust the diffraction angle of the laser beam after passing through the aperture.
According to the diffraction principle, theta is r/f; wherein r is the radius of a diffraction ring formed after the laser beam reaches the CCD target surface, and f is the equivalent focal length.
From the above, the diffraction pattern of the laser beam on the CCD target surface is a circular ring-shaped light intensity stripe, and Z is equal to 0, i.e. at the optical axis center point P0At the position of the air compressor, the air compressor is started,
when the light intensity has a maximum value; when J is1(Z)＝0，
When the light intensity is at a minimum.
Thus, there is a maximum between the light intensities of two adjacent minima, and the central light energy is strongest. Assuming that the radius of a spot with the maximum central light intensity on the CCD target surface is r after the laser beam is diffracted by the small hole0Then the following formula can be obtained:
in the above formula, θ0The diffraction angle corresponding to the diffraction ring with the maximum illumination intensity formed on the CCD target surface after the laser beam passes through the circular hole is shown; λ represents the wavelength of the laser beam; a denotes the radius of the opening.
Based on the principle, when the laser light path with the wavelength of 1080nm is adjusted, the diameters of the round holes of the first orifice plate and the second orifice plate can be set to be 4mm and 9mm respectively, and the offset of the laser beam in the X-axis direction and the Y-axis direction can be adjusted through the third adjusting bolt and the fourth adjusting bolt respectively; meanwhile, the diameters of the round holes of the third orifice plate and the fourth orifice plate can be set to be 4mm and 5mm respectively, and the laser beams can be finely adjusted in the rotating direction around the X axis and the rotating direction around the Y axis through the first adjusting bolt and the second adjusting bolt respectively.
As shown in fig. 5, the present embodiment also provides an adjusting method of the optical path adjusting apparatus of the fiber laser, including: s1, arranging the fiber laser, the lens cone and the CCD target surface in sequence along the transmission direction of the laser beam, and installing the lens cone on the adjusting bracket; s2, installing a first pore plate at the light inlet of the lens cone, installing a second pore plate at the light outlet of the lens cone, starting the fiber laser, and adjusting the lens cone in the X-axis direction and the Y-axis direction until the center of a light spot formed by the laser beam on the CCD target surface coincides with the center of the positioning mark on the CCD target surface; and S3, detaching the first pore plate and the second pore plate from the lens cone, installing a third pore plate at the light inlet of the lens cone, installing a fourth pore plate at the light outlet of the lens cone, and adjusting the rotation direction of the lens cone around the X axis and the rotation direction of the lens cone around the Y axis until the light spots form a diffraction ring pattern with central symmetry distribution on the CCD target surface.
Specifically, the present embodiment combines the first group of aperture plates and the second group of aperture plates shown in the above embodiments, and takes the adjustment of the optical path of the laser beam having a wavelength of 1080nm as an example, and the following specific description is made.
Firstly, fixing an output head of the optical fiber laser in a light path for testing the quality of laser beams, setting the output power of the optical fiber laser, calculating a proper laser attenuation multiple, and adding an attenuation lens to enable the energy of the laser beams output by the optical fiber laser to be within a safety threshold range required by a beam quality factor tester.
And secondly, initially adjusting the laser light path, placing the CCD target surface of the beam quality factor tester in the light path, recording the position of the light spot at the moment, and positioning by using a positioning mark on the CCD target surface, wherein the positioning mark is generally a cross word line known in the field.
And thirdly, mounting a first pore plate with the aperture of 4mm at a light inlet of the lens cone, mounting a second pore plate with the aperture of 9mm at a light outlet of the lens cone, starting the optical fiber laser, and observing the approximate distribution position of light spots on the light beam quality factor tester. The concentric ring formed by the pinhole diffraction principle has offset on the image relative to the X-Y direction, the center of the ring is not overlapped with the physical center for positioning the cross target, the light spot image on the CCD target surface is observed, at the moment, the third adjusting bolt and the fourth adjusting bolt are screwed to adjust the X-axis direction and the Y-axis direction, so that the center of the light spot image is gradually overlapped with the center of the cross target, and the primary adjustment of the consistency of the incident laser and the optical axis of the CCD target surface is completed. The purpose of this step is to adjust the amount of horizontal and vertical offset of the laser beam. After the adjustment of this step, a diffraction pattern at the center of the CCD target surface can be obtained, but the diffraction pattern is a non-uniform symmetric diffraction ring, as shown in fig. 6, because the laser beam still has a rotation with respect to the Y-axis and a shift with respect to the pitch direction of the X-axis in the spherical emitting surface.
And fourthly, similarly adopting a pore plate with the aperture of 4mm at the light inlet of the lens cone, detaching the second pore plate from the lens cone, and replacing the fourth pore plate with the aperture of 5 mm. The purpose of this adjustment is to adjust the degree of offset of the laser beam with respect to the rotation of the Y-axis and the pitch direction with respect to the X-axis. When the fourth pore plate is replaced and the fiber laser is started again, the diffraction ring formed on the CCD target surface is checked, only the first adjusting bolt and the second adjusting bolt are needed to be finely adjusted, the divergence offset of the laser beam in the spherical surface of the laser output end can be adjusted until a uniform and symmetrical diffraction pattern is obtained, namely the diffraction pattern is a plurality of circular diffraction rings distributed in central symmetry, as shown in fig. 7, and after the step is completed, a completely symmetrical diffraction ring is clearly seen in the beam quality analyzer. And at the moment, debugging of the laser beam quality analysis test light path is completed. The result shows that the device has high adjusting efficiency and can well present the original mode of the laser spot.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (10)
1. An optical path adjusting apparatus for a fiber laser, comprising:
a lens barrel;
the hole plate assembly comprises a plurality of hole plates, the hole plates are detachably arranged at the light inlet and the light outlet of the lens cone, the hole plates are provided with openings which are coaxial with the lens cone, and the openings are used for allowing laser beams to pass through;
the lens cone is arranged on the adjusting bracket, so that the lens cone can be adjusted along the X-axis direction, the Y-axis direction, the rotating direction surrounding the X-axis and the rotating direction surrounding the Y-axis, and the X-axis direction is perpendicular to the Y-axis direction and is distributed on a plane where the optical axis perpendicular to the lens cone is located.
2. The optical path adjusting apparatus of a fiber laser as claimed in claim 1, wherein the adjusting bracket includes a fixing frame and an adjusting plate disposed at an interval;
a fixed point position, a first adjusting point position and a second adjusting point position are arranged on the fixing frame, a connecting line of the fixed point position and the first adjusting point position is arranged along the X-axis direction, and a connecting line of the fixed point position and the second adjusting point position is arranged along the Y-axis direction; the fixing frame is fixedly connected with the first surface of the adjusting plate through the fixing point position; the fixing frame is respectively connected with the first surface in an adjustable manner along the optical axis direction of the lens cone through the first adjusting point position and the second adjusting point position;
the adjusting plate is provided with a through hole, the lens barrel penetrates through the through hole, the outer diameter of the lens barrel is smaller than the aperture of the through hole, and the lens barrel is connected with a second surface, back to the first surface, of the adjusting plate;
the adjusting plate is provided with a third adjusting point position and a fourth adjusting point position, and is respectively connected with the outer side wall of the lens barrel along the radial direction in an adjustable manner through the third adjusting point position and the fourth adjusting point position, the radial adjusting direction of the third adjusting point position is along the X-axis direction, and the radial adjusting direction of the fourth adjusting point position is along the Y-axis direction.
3. The optical path adjusting device of the optical fiber laser as claimed in claim 2, wherein a first adjusting bolt is installed at the first adjusting point, a second adjusting bolt is installed at the second adjusting point, the first adjusting bolt and the second adjusting bolt are both installed on the fixing frame, and screw ends of the first adjusting bolt and the second adjusting bolt respectively extend perpendicularly to the first surface along the optical axis direction;
the third adjusting point is provided with a third adjusting bolt, the fourth adjusting point is provided with a fourth adjusting bolt, the third adjusting bolt and the fourth adjusting bolt are installed on the adjusting plate, the screw end of the third adjusting bolt and the screw end of the fourth adjusting bolt extend into the through hole and respectively extend to the outer side wall of the lens cone along the radial direction of the lens cone.
4. The optical path adjusting apparatus of a fiber laser as claimed in claim 2, wherein the fixing frame includes a fixing portion and an adjusting portion, the fixing portion is disposed perpendicular to the adjusting portion, the adjusting portion is disposed at a distance from the adjusting plate, and the adjusting portion is disposed with the fixing point, the first adjusting point and the second adjusting point.
5. The optical path adjusting apparatus of a fiber laser as claimed in claim 2, wherein the adjusting bracket further includes a mounting plate mounted on the second surface of the adjusting plate and fixedly connected to the barrel.
6. The optical path adjusting apparatus of a fiber laser according to claim 5, wherein the barrel includes a first barrel and a second barrel, the first barrel is slidably inserted into the second barrel, the first barrel passes through the through hole, and the second barrel is fixedly connected to the mounting plate.
7. The optical path adjusting apparatus of the fiber laser as claimed in claim 1, wherein the orifice plate assembly includes a first group of orifice plates and a second group of orifice plates;
the first group of pore plates comprise a first pore plate and a second pore plate, the first pore plate is used for being installed at a light inlet of the lens cone, the second pore plate is used for being installed at a light outlet of the lens cone, the diameter of an opening of the first pore plate is smaller than 2/3 of the diameter of a light spot of the laser beam, and the diameter of an opening of the second pore plate is larger than 1.5 times of the diameter of the light spot;
the second group of pore plates comprise a third pore plate and a fourth pore plate, the third pore plate is used for being installed at the light inlet of the lens barrel, the fourth pore plate is used for being installed at the light outlet of the lens barrel, the opening diameter of the third pore plate is smaller than 2/3 of the diameter of the light spot, and the opening diameter of the fourth pore plate is larger than 2/3 of the diameter of the light spot.
8. The optical path adjusting apparatus of a fiber laser according to any one of claims 1 to 7, wherein the radius of the opening and the wavelength of the laser beam satisfy the following equation:
θ0＝0.61λ/a；
wherein, theta0The diffraction angle corresponding to the diffraction ring with the maximum illumination intensity formed on the CCD target surface by the laser beam through the opening is represented; λ represents the wavelength of the laser beam; a represents the radius of the opening; the CCD target surface is arranged on the side close to the light outlet of the lens cone, and the CCD target surface is perpendicular to the direction of the optical axis of the lens cone.
9. An adjusting method of an optical path adjusting apparatus of a fiber laser according to any one of claims 1 to 8, comprising:
s1, arranging the fiber laser, the lens cone and the CCD target surface in sequence along the transmission direction of the laser beam, and installing the lens cone on the adjusting bracket;
s2, installing a first pore plate at the light inlet of the lens cone, installing a second pore plate at the light outlet of the lens cone, starting the fiber laser, and adjusting the lens cone in the X-axis direction and the Y-axis direction until the center of a light spot formed by the laser beam on the CCD target surface coincides with the center of the positioning mark on the CCD target surface;
and S3, detaching the first pore plate and the second pore plate from the lens cone, installing a third pore plate at the light inlet of the lens cone, installing a fourth pore plate at the light outlet of the lens cone, and adjusting the rotation direction of the lens cone around the X axis and the rotation direction of the lens cone around the Y axis until the light spots form a diffraction ring pattern with central symmetry distribution on the CCD target surface.
10. The adjustment method according to claim 9, wherein S1 further includes:
setting the output power of the fiber laser, enabling the beam energy corresponding to the output power to be within the safety threshold range of the beam quality factor tester, starting the fiber laser, recording light spots formed by laser beams on a CCD target surface, and primarily positioning the light spots through positioning marks on the CCD target surface;
wherein, the CCD target surface is arranged on the light beam quality factor tester.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
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| CN202011460145.1A CN112596249A (en) | 2020-12-11 | 2020-12-11 | Optical path adjusting device and method of optical fiber laser |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202011460145.1A CN112596249A (en) | 2020-12-11 | 2020-12-11 | Optical path adjusting device and method of optical fiber laser |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116009231A (en) * | 2022-12-15 | 2023-04-25 | 江苏缪斯光电科技有限公司 | Calibrating device for laser optical sighting telescope |
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2020
- 2020-12-11 CN CN202011460145.1A patent/CN112596249A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116009231A (en) * | 2022-12-15 | 2023-04-25 | 江苏缪斯光电科技有限公司 | Calibrating device for laser optical sighting telescope |
| CN116009231B (en) * | 2022-12-15 | 2023-09-22 | 江苏缪斯光电科技有限公司 | Calibrating device for laser optical sighting telescope |
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